/* ============================================================
   (주)영신 Design System v3.0
   Reference: startup.snu.ac.kr — Clean, Minimal, Premium
   ============================================================ */

/* ─── Pretendard Font ─────────────────────────────────────── */
@import url('https://cdn.jsdelivr.net/gh/orioncactus/pretendard@v1.3.9/dist/web/variable/pretendardvariable-dynamic-subset.min.css');

/* ─── Noto Sans KR (로고용 ExtraBold) ────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+KR:wght@800&display=swap');

/* ─── Design Tokens ──────────────────────────────────────── */
:root {
    --color-primary: #2563EB;
    --color-primary-dark: #1D4ED8;
    --color-primary-light: #3B82F6;
    --color-primary-50: #EFF6FF;
    --color-primary-100: #DBEAFE;
    --color-primary-600: #2563EB;
    --color-primary-700: #1D4ED8;

    --color-white: #FFFFFF;
    --color-bg: #FFFFFF;
    --color-bg-alt: #F8F9FA;
    --color-bg-dark: #F1F3F5;

    --color-gray-50: #F9FAFB;
    --color-gray-100: #F3F4F6;
    --color-gray-200: #E5E7EB;
    --color-gray-300: #D1D5DB;
    --color-gray-400: #9CA3AF;
    --color-gray-500: #6B7280;
    --color-gray-600: #4B5563;
    --color-gray-700: #374151;
    --color-gray-800: #1F2937;
    --color-gray-900: #111827;
    --color-black: #000000;

    --color-success: #10B981;
    --color-warning: #F59E0B;
    --color-error: #EF4444;

    --font-family: 'Pretendard Variable', Pretendard, -apple-system, BlinkMacSystemFont, system-ui, Roboto, 'Helvetica Neue', 'Segoe UI', 'Apple SD Gothic Neo', 'Noto Sans KR', 'Malgun Gothic', sans-serif;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.10);
    --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.04), 0 4px 12px rgba(0, 0, 0, 0.04);
    --shadow-card-hover: 0 4px 12px rgba(0, 0, 0, 0.06), 0 12px 32px rgba(0, 0, 0, 0.08);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    --transition-fast: 0.15s ease;
    --transition-base: 0.25s ease;
    --transition-slow: 0.4s ease;

    --container-max: 1200px;
    --header-height: 80px;
    --section-gap: 120px;
}

/* ─── Reset ──────────────────────────────────────────────── */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-weight: 400;
    font-size: 16px;
    line-height: 1.7;
    color: var(--color-gray-800);
    background: var(--color-bg);
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
}

ul, ol {
    list-style: none;
}

select {
    font-family: inherit;
}

address {
    font-style: normal;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.35;
    color: var(--color-gray-900);
    letter-spacing: -0.02em;
}


/* ============================================================
   HEADER / NAVIGATION
   ============================================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--header-height);
    background: transparent;
    border-bottom: 1px solid transparent;
    transition: background 0.4s ease, box-shadow 0.4s ease, border-color 0.4s ease;
}

.header.scrolled {
    background: var(--color-white);
    border-bottom-color: var(--color-gray-200);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

.header-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 32px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* Logo */
.logo a {
    display: flex;
    align-items: center;
    height: 100%;
}

.logo-text {
    font-family: 'Noto Sans KR', sans-serif;
    font-size: 22px;
    font-weight: 800;
    color: var(--color-gray-900);
    letter-spacing: -0.5px;
    white-space: nowrap;
    transition: color 0.4s ease;
}

/* Transparent header on hero */
body[data-page="home"] .header:not(.scrolled) .logo-text { color: var(--color-white); }
body[data-page="home"] .header:not(.scrolled) .nav-menu li a { color: rgba(255,255,255,0.85); }
body[data-page="home"] .header:not(.scrolled) .nav-menu li a:hover { color: var(--color-white); }
body[data-page="home"] .header:not(.scrolled) .nav-menu li a.active { color: var(--color-white); }
body[data-page="home"] .header:not(.scrolled) .lang-btn { color: rgba(255,255,255,0.7); background: transparent; }
body[data-page="home"] .header:not(.scrolled) .lang-btn.active { color: var(--color-white); background: rgba(255,255,255,0.15); }
body[data-page="home"] .header:not(.scrolled) .lang-buttons { background: rgba(255,255,255,0.1); }
body[data-page="home"] .header:not(.scrolled) .hamburger span { background: var(--color-white); }

/* Navigation */
.navigation {
    display: flex;
    align-items: center;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 40px;
}

.nav-menu li a {
    font-size: 15px;
    font-weight: 500;
    color: var(--color-gray-600);
    padding: 8px 0;
    position: relative;
    transition: color var(--transition-fast);
}

.nav-menu li a:hover {
    color: var(--color-gray-900);
}

.nav-menu li a.active {
    color: var(--color-primary);
    font-weight: 600;
}

.nav-menu li a.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--color-primary);
    border-radius: 1px;
}

/* Header Controls */
.header-controls {
    display: flex;
    align-items: center;
    gap: 16px;
}

.lang-buttons {
    display: flex;
    align-items: center;
    gap: 2px;
    background: var(--color-gray-100);
    border-radius: var(--radius-full);
    padding: 3px;
}

.lang-btn {
    font-family: var(--font-family);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.3px;
    color: var(--color-gray-500);
    background: transparent;
    border: none;
    border-radius: var(--radius-full);
    padding: 5px 10px;
    cursor: pointer;
    outline: none;
    transition: all var(--transition-fast);
    white-space: nowrap;
    line-height: 1;
}

.lang-btn:hover {
    color: var(--color-gray-800);
}

.lang-btn.active {
    background: var(--color-white);
    color: var(--color-primary);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

@media (max-width: 768px) {
    .lang-buttons {
        gap: 1px;
        padding: 2px;
    }
    .lang-btn {
        font-size: 10px;
        padding: 4px 7px;
    }
}

/* Hamburger */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
}

.hamburger span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--color-gray-700);
    border-radius: 2px;
    transition: var(--transition-fast);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Menu */
.mobile-menu {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-white);
    border-bottom: 1px solid var(--color-gray-200);
    z-index: 999;
    opacity: 0;
    transform: translateY(-10px);
    pointer-events: none;
    transition: opacity var(--transition-base), transform var(--transition-base);
}

.mobile-menu.active {
    opacity: 1;
    transform: translateY(0);
    pointer-events: all;
}

.mobile-nav-menu {
    padding: 16px 32px;
}

.mobile-nav-menu li {
    border-bottom: 1px solid var(--color-gray-100);
}

.mobile-nav-menu li:last-child {
    border-bottom: none;
}

.mobile-nav-menu li a {
    display: block;
    padding: 16px 0;
    font-size: 15px;
    font-weight: 500;
    color: var(--color-gray-700);
}

.mobile-nav-menu li a.active {
    color: var(--color-primary);
}


/* ============================================================
   CONTAINER
   ============================================================ */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 32px;
}


/* ============================================================
   COMMON UI ELEMENTS
   ============================================================ */

/* Section Label (small blue marker) */
.section-label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: 20px;
}

.section-label::before {
    content: '';
    display: inline-block;
    width: 24px;
    height: 2px;
    background: var(--color-primary);
    border-radius: 1px;
}

/* Section Title */
.section-title {
    font-size: 36px;
    font-weight: 800;
    color: var(--color-gray-900);
    line-height: 1.3;
    letter-spacing: -0.03em;
    margin-bottom: 20px;
}

/* Section Header (centered) */
.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-header .section-title {
    margin-bottom: 16px;
}

.section-header .section-desc {
    font-size: 16px;
    color: var(--color-gray-500);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.7;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 15px;
    font-weight: 600;
    padding: 12px 28px;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    cursor: pointer;
    border: none;
    text-decoration: none;
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-white);
}

.btn-primary:hover {
    background: var(--color-primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.btn-secondary {
    background: var(--color-white);
    color: var(--color-gray-700);
    border: 1px solid var(--color-gray-300);
}

.btn-secondary:hover {
    border-color: var(--color-gray-400);
    background: var(--color-gray-50);
}

.btn-outline {
    background: transparent;
    color: var(--color-primary);
    border: 1px solid var(--color-primary);
}

.btn-outline:hover {
    background: var(--color-primary);
    color: var(--color-white);
}

.btn-text {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 15px;
    font-weight: 600;
    color: var(--color-primary);
    transition: gap var(--transition-fast);
}

.btn-text::after {
    content: '\2192';
    transition: transform var(--transition-fast);
}

.btn-text:hover {
    gap: 10px;
}

.btn-text:hover::after {
    transform: translateX(2px);
}


/* ============================================================
   SCROLL REVEAL ANIMATION
   ============================================================ */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}


/* ============================================================
   HERO SLIDER (Homepage)
   ============================================================ */
.hero-slider {
    position: relative;
    width: 100%;
    height: 100vh;
    margin-top: 0;
    overflow: hidden;
    background: var(--color-gray-900);
}

.slider-wrapper {
    display: flex;
    width: 100%;
    height: 100%;
    transition: transform 0.6s ease;
}

.slide {
    min-width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    position: relative;
}

.slide::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(0,0,0,0.1) 0%, rgba(0,0,0,0.25) 40%, rgba(0,0,0,0.5) 100%);
}

.slide-content {
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-end;
    height: 100%;
    text-align: left;
    padding: 0 0 12vh 8vw;
    max-width: 900px;
}

.slide-title {
    font-size: clamp(32px, 4.5vw, 56px);
    font-weight: 800;
    color: var(--color-white);
    line-height: 1.25;
    letter-spacing: -0.03em;
    margin-bottom: 20px;
    text-shadow: 0 2px 12px rgba(0, 0, 0, 0.35);
}

.slide-subtitle {
    font-size: clamp(14px, 1.2vw, 18px);
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.7;
    margin-bottom: 36px;
    max-width: 560px;
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.25);
}

.slide-cta {
    display: flex;
    gap: 12px;
}

.slide-cta .btn-primary {
    background: var(--color-white);
    color: var(--color-gray-900);
    font-weight: 600;
}

.slide-cta .btn-primary:hover {
    background: var(--color-gray-100);
    box-shadow: none;
    transform: none;
}

.slide-cta .btn-secondary {
    background: transparent;
    color: var(--color-white);
    border: 1px solid rgba(255, 255, 255, 0.5);
}

.slide-cta .btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.8);
}

/* Slider Indicators */
.slider-indicators {
    position: absolute;
    right: 40px;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 3;
}

.indicator {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.35);
    border: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition-fast);
}

.indicator:hover {
    background: rgba(255, 255, 255, 0.6);
}

.indicator.active {
    background: var(--color-white);
    height: 28px;
    border-radius: 5px;
    width: 10px;
}

/* Slider Controls */
.slider-control {
    position: absolute;
    bottom: 8vh;
    z-index: 3;
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.12);
    backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-white);
    transition: var(--transition-base);
}

.slider-control:hover {
    background: rgba(255, 255, 255, 0.25);
    border-color: rgba(255, 255, 255, 0.35);
    transform: scale(1.05);
}

.slider-control svg {
    width: 20px;
    height: 20px;
}

.slider-control.prev {
    right: calc(8vw + 68px);
    left: auto;
}

.slider-control.next {
    right: 8vw;
    left: auto;
}


/* ============================================================
   STATS BAR (Homepage)
   ============================================================ */
.stats-bar {
    background: var(--color-gray-900);
    padding: 64px 0;
    position: relative;
    overflow: hidden;
}

.stats-bar::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(37,99,235,0.08) 0%, transparent 50%, rgba(37,99,235,0.05) 100%);
    pointer-events: none;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    text-align: center;
    position: relative;
}

.stat-item {
    padding: 24px 16px;
    position: relative;
}

.stat-item::after {
    content: '';
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 1px;
    height: 48px;
    background: rgba(255,255,255,0.1);
}

.stat-item:last-child::after {
    display: none;
}

.stat-number {
    font-size: 48px;
    font-weight: 800;
    color: var(--color-white);
    letter-spacing: -0.03em;
    line-height: 1;
    margin-bottom: 12px;
}

.stat-number::after {
    content: '+';
    font-size: 30px;
    font-weight: 600;
    color: var(--color-primary-light);
}

.stat-label {
    font-size: 14px;
    font-weight: 500;
    color: rgba(255,255,255,0.5);
    letter-spacing: 0.06em;
    text-transform: uppercase;
}


/* ============================================================
   COMPANY SECTION (Homepage)
   ============================================================ */
.company-section {
    padding: 140px 0;
    background: var(--color-bg);
}

.company-grid {
    display: grid;
    grid-template-columns: 1fr 1.1fr;
    gap: 100px;
    align-items: center;
}

.company-content .section-label {
    font-size: 13px;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-bottom: 20px;
    display: inline-block;
}

.company-content .section-title {
    font-size: 34px;
    margin-bottom: 28px;
    line-height: 1.4;
}

.company-description {
    font-size: 16px;
    color: var(--color-gray-600);
    line-height: 1.9;
    margin-bottom: 40px;
}

.btn-text {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 15px;
    font-weight: 600;
    color: var(--color-primary);
    transition: gap var(--transition-base);
}

.btn-text::after {
    content: '→';
    transition: transform var(--transition-base);
}

.btn-text:hover {
    gap: 12px;
}

.btn-text:hover::after {
    transform: translateX(4px);
}

.company-image {
    border-radius: var(--radius-xl);
    overflow: hidden;
    position: relative;
}

.company-image::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius-xl);
    box-shadow: inset 0 0 0 1px rgba(0,0,0,0.06);
    pointer-events: none;
}

.company-image img {
    width: 100%;
    height: 480px;
    object-fit: cover;
    border-radius: var(--radius-xl);
    transition: transform 0.6s ease;
}

.company-image:hover img {
    transform: scale(1.03);
}


/* ============================================================
   PRODUCTS SECTION (Homepage)
   ============================================================ */
.products-section {
    padding: 140px 0;
    background: var(--color-bg-alt);
}

.products-section .section-header {
    text-align: center;
    margin-bottom: 56px;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.product-card {
    background: var(--color-white);
    border: 1px solid var(--color-gray-100);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: transform 0.4s ease, box-shadow 0.4s ease;
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.08);
}

.product-image {
    width: 100%;
    height: 260px;
    overflow: hidden;
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.product-card:hover .product-image img {
    transform: scale(1.08);
}

.product-content {
    padding: 28px 28px 32px;
}

.product-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: 6px;
}

.product-subtitle {
    font-size: 14px;
    color: var(--color-primary);
    font-weight: 500;
    margin-bottom: 14px;
}

.product-description {
    font-size: 15px;
    color: var(--color-gray-600);
    line-height: 1.7;
    margin-bottom: 20px;
}


/* ============================================================
   R&D / RESEARCH SECTION (Homepage)
   ============================================================ */
.research-section {
    padding: 140px 0;
    background: var(--color-bg);
}

.research-section .section-header {
    text-align: center;
    margin-bottom: 56px;
}

.research-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.research-card {
    border-radius: var(--radius-xl);
    overflow: hidden;
    cursor: pointer;
}

.research-image {
    position: relative;
    width: 100%;
    height: 360px;
    background-size: cover;
    background-position: center;
    border-radius: var(--radius-xl);
    overflow: hidden;
}

.research-image::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 15%, rgba(0,0,0,0.85) 100%);
    transition: opacity 0.4s ease;
}

.research-card:hover .research-image::after {
    background: linear-gradient(180deg, rgba(37,99,235,0.1) 0%, rgba(0,0,0,0.8) 100%);
}

.research-overlay {
    position: absolute;
    inset: 0;
    z-index: 1;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: 32px;
    transition: transform 0.4s ease;
}

.research-card:hover .research-overlay {
    transform: translateY(-4px);
}

.research-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: 8px;
}

.research-subtitle {
    font-size: 13px;
    font-weight: 400;
    color: rgba(255, 255, 255, 0.8);
    letter-spacing: 0;
    text-transform: none;
    line-height: 1.5;
}


/* ============================================================
   IR SECTION (Homepage)
   ============================================================ */
.ir-section {
    padding: 140px 0;
    background: var(--color-bg-alt);
}

.ir-section .section-header {
    text-align: center;
    margin-bottom: 56px;
}

.ir-content {
    margin-bottom: 40px;
}

.ir-placeholder {
    text-align: center;
    padding: 48px;
    color: var(--color-gray-400);
    font-size: 15px;
}

.section-footer {
    text-align: center;
}


/* ============================================================
   CONTACT SECTION (Homepage)
   ============================================================ */
/* ===== Contact CTA (Homepage) ===== */
.contact-section {
    padding: 120px 0;
    background: var(--color-gray-900);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.contact-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 50% 120%, rgba(37,99,235,0.12) 0%, transparent 60%);
    pointer-events: none;
}

.contact-content {
    position: relative;
}

.contact-content .section-title {
    color: var(--color-white);
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 56px;
    letter-spacing: -0.02em;
}

.contact-info {
    display: flex;
    justify-content: center;
    gap: 80px;
    margin-bottom: 56px;
}

.contact-item {
    display: flex;
    flex-direction: column;
    gap: 10px;
    align-items: center;
}

.contact-label {
    font-size: 12px;
    font-weight: 600;
    color: rgba(255,255,255,0.4);
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.contact-item a,
.contact-item span {
    color: var(--color-white);
    font-size: 18px;
    font-weight: 500;
}

.contact-item a:hover {
    color: var(--color-primary-light);
}

.contact-section .btn-primary {
    background: var(--color-primary);
    color: var(--color-white);
    border: none;
    padding: 16px 48px;
    font-size: 16px;
    font-weight: 600;
    border-radius: 100px;
    transition: all 0.3s ease;
}

.contact-section .btn-primary:hover {
    background: var(--color-primary-dark);
    box-shadow: 0 8px 32px rgba(37, 99, 235, 0.35);
    transform: translateY(-2px);
}


/* ============================================================
   PAGE HERO (Subpages)
   ============================================================ */
.page-hero {
    margin-top: var(--header-height);
    padding: 80px 0;
    background: var(--color-bg-alt);
    text-align: center;
    border-bottom: 1px solid var(--color-gray-200);
}

.page-hero-content {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 32px;
}

.page-hero-label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 600;
    color: var(--color-primary);
    letter-spacing: 0.04em;
    text-transform: uppercase;
    margin-bottom: 16px;
}

.page-hero-title {
    font-size: 40px;
    font-weight: 800;
    color: var(--color-gray-900);
    letter-spacing: -0.03em;
    margin-bottom: 12px;
}

.page-hero-subtitle {
    font-size: 16px;
    color: var(--color-gray-500);
    max-width: 500px;
    margin: 0 auto;
    line-height: 1.7;
}


/* ============================================================
   SUB NAVIGATION (within pages)
   ============================================================ */
.sub-nav {
    background: var(--color-white);
    border-bottom: 1px solid var(--color-gray-200);
    padding: 0;
    position: sticky;
    top: var(--header-height);
    z-index: 100;
}

.sub-nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 32px;
    display: flex;
    justify-content: center;
    gap: 0;
}

.sub-nav-item {
    font-size: 15px;
    font-weight: 500;
    color: var(--color-gray-500);
    padding: 20px 24px;
    border-bottom: 2px solid transparent;
    transition: all var(--transition-fast);
    cursor: pointer;
    white-space: nowrap;
}

.sub-nav-item:hover {
    color: var(--color-gray-900);
}

.sub-nav-item.active {
    color: var(--color-primary);
    font-weight: 600;
    border-bottom-color: var(--color-primary);
}


/* ============================================================
   COMPANY PAGE
   ============================================================ */

/* Mission/Vision Cards */
.vision-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-bottom: 80px;
}

.vision-card {
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
    padding: 40px;
    transition: box-shadow var(--transition-base);
}

.vision-card:hover {
    box-shadow: var(--shadow-card-hover);
}

.vision-card-icon {
    width: 48px;
    height: 48px;
    background: var(--color-primary-50);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    font-size: 24px;
}

.vision-card-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: 12px;
}

.vision-card-text {
    font-size: 15px;
    color: var(--color-gray-600);
    line-height: 1.7;
}

/* CEO Message */
.ceo-section {
    padding: 80px 0;
    background: var(--color-bg-alt);
}

.ceo-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.ceo-message h3 {
    font-size: 24px;
    margin-bottom: 20px;
}

.ceo-message p {
    font-size: 15px;
    color: var(--color-gray-600);
    line-height: 1.8;
    margin-bottom: 12px;
}

.ceo-name {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-gray-900);
    margin-top: 24px;
}

/* Timeline */
.timeline-section {
    padding: 80px 0;
}

.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--color-gray-200);
    transform: translateX(-50%);
}

.timeline-item {
    display: flex;
    align-items: center;
    margin-bottom: 40px;
    position: relative;
}

.timeline-year {
    flex: 1;
    text-align: right;
    padding-right: 40px;
    font-size: 20px;
    font-weight: 700;
    color: var(--color-primary);
}

.timeline-dot {
    width: 12px;
    height: 12px;
    background: var(--color-primary);
    border-radius: 50%;
    position: relative;
    z-index: 1;
    flex-shrink: 0;
}

.timeline-content {
    flex: 1;
    padding-left: 40px;
    font-size: 15px;
    color: var(--color-gray-700);
    line-height: 1.6;
}

/* Company Info */
.info-section {
    padding: 80px 0;
    background: var(--color-bg-alt);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.info-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 24px;
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-md);
}

.info-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-gray-400);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    min-width: 80px;
}

.info-value {
    font-size: 15px;
    color: var(--color-gray-800);
    font-weight: 500;
}

/* Directions */
.directions-section {
    padding: 80px 0;
}

.directions-map-wrap {
    margin-top: 32px;
}

.map-container {
    width: 100%;
    height: 420px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--color-gray-200);
    box-shadow: var(--shadow-card);
}

.map-container iframe {
    width: 100%;
    height: 100%;
    border: none;
}

.directions-info-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-top: 32px;
}

.directions-info-card {
    background: var(--color-gray-50);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-md);
    padding: 24px 20px;
    text-align: center;
}

.directions-info-icon {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--color-primary-50);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 12px;
}

.directions-info-icon svg {
    width: 20px;
    height: 20px;
    stroke: var(--color-primary);
}

.directions-info-card h4 {
    font-size: 13px;
    font-weight: 700;
    color: var(--color-gray-800);
    margin-bottom: 8px;
}

.directions-info-card p {
    font-size: 13px;
    color: var(--color-gray-600);
    line-height: 1.6;
}

.directions-info-card a {
    color: var(--color-primary);
    font-weight: 600;
}

.directions-map-buttons {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-top: 24px;
}

.map-nav-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 24px;
    border-radius: var(--radius-full);
    font-size: 14px;
    font-weight: 600;
    color: var(--color-white);
    transition: all var(--transition-fast);
    text-decoration: none;
}

.map-nav-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.map-nav-icon {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: rgba(255,255,255,0.25);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 800;
}

.map-nav-naver {
    background: #03C75A;
}

.map-nav-kakao {
    background: #FEE500;
    color: #3C1E1E;
}

.map-nav-kakao .map-nav-icon {
    background: rgba(0,0,0,0.1);
}

.map-nav-google {
    background: #4285F4;
}


/* ============================================================
   PRODUCTS PAGE
   ============================================================ */
.products-page-section {
    padding: 80px 0;
}

.product-detail {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    padding: 60px 0;
    border-bottom: 1px solid var(--color-gray-200);
}

.product-detail:last-child {
    border-bottom: none;
}

.product-detail.reverse {
    direction: rtl;
}

.product-detail.reverse > * {
    direction: ltr;
}

.product-detail-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.product-detail-image img {
    width: 100%;
    height: 360px;
    object-fit: cover;
    border-radius: var(--radius-lg);
}

.product-detail-content h3 {
    font-size: 28px;
    font-weight: 800;
    color: var(--color-gray-900);
    margin-bottom: 8px;
}

.product-detail-content .product-subtitle {
    font-size: 14px;
    color: var(--color-primary);
    font-weight: 600;
    margin-bottom: 20px;
}

.product-detail-content p {
    font-size: 15px;
    color: var(--color-gray-600);
    line-height: 1.8;
    margin-bottom: 16px;
}

.product-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: 16px;
}

.product-tag {
    font-size: 13px;
    font-weight: 500;
    color: var(--color-primary);
    background: var(--color-primary-50);
    padding: 4px 12px;
    border-radius: var(--radius-full);
}

/* Product Features */
.product-features {
    margin-top: 28px;
    padding-top: 24px;
    border-top: 1px solid var(--color-gray-200);
}

.product-features h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: 14px;
    letter-spacing: -0.01em;
}

.product-features ul {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px 24px;
}

.product-features li {
    font-size: 14px;
    color: var(--color-gray-600);
    line-height: 1.6;
    padding-left: 18px;
    position: relative;
}

.product-features li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    width: 6px;
    height: 6px;
    background: var(--color-primary);
    border-radius: 50%;
}


/* ============================================================
   PROJECT PAGE
   ============================================================ */
.projects-section {
    padding: 80px 0;
}

.project-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.project-card {
    position: relative;
    overflow: hidden;
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.project-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-card-hover);
}

/* ── Project Status Badge (COMPLETED stamp) ──────────────── */
.project-status-badge {
    position: absolute;
    top: 18px;
    right: -10px;
    z-index: 2;
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.1em;
    padding: 7px 20px 7px 14px;
    border-radius: 4px 0 0 4px;
    line-height: 1;
    pointer-events: none;
    box-shadow: 0 2px 8px rgba(0,0,0,0.18);
    font-family: 'Arial Black', 'Impact', sans-serif;
}
.project-status-badge.completed {
    background: linear-gradient(135deg, #DC2626 0%, #B91C1C 100%);
    color: #fff;
    border: 2px solid #991B1B;
    border-right: none;
}
.project-status-badge.completed::before {
    content: '';
    position: absolute;
    right: 0;
    bottom: -8px;
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 0 10px 8px 0;
    border-color: transparent #7F1D1D transparent transparent;
}

.project-card-label {
    font-size: 12px;
    font-weight: 600;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 12px;
}

.project-card h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: 8px;
}

.project-card p {
    font-size: 14px;
    color: var(--color-gray-600);
    line-height: 1.7;
}

.project-card-year {
    font-size: 13px;
    font-weight: 500;
    color: var(--color-gray-400);
    margin-top: 16px;
}

/* Certifications */
.cert-section {
    padding: 80px 0;
    background: var(--color-bg-alt);
}

.cert-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 20px;
}

.cert-item {
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-md);
    padding: 20px;
    text-align: center;
    transition: box-shadow var(--transition-base);
}

.cert-item:hover {
    box-shadow: var(--shadow-md);
}

.cert-item img {
    width: 100%;
    height: 120px;
    object-fit: contain;
    margin-bottom: 12px;
}

.cert-item p {
    font-size: 12px;
    color: var(--color-gray-600);
    line-height: 1.4;
}

.cert-description {
    font-size: 13px;
    color: var(--color-gray-500);
    text-align: center;
    margin-top: 12px;
    line-height: 1.4;
}


/* ============================================================
   IR/PRESS PAGE
   ============================================================ */
.ir-page-section {
    padding: 60px 0;
}

/* Category tabs */
.ir-categories {
    display: flex;
    gap: 8px;
    margin-bottom: 32px;
    flex-wrap: wrap;
}

.ir-category-btn {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-gray-500);
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    padding: 8px 20px;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.ir-category-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.ir-category-btn.active {
    background: var(--color-primary);
    color: var(--color-white);
    border-color: var(--color-primary);
}

/* Search */
.ir-search {
    display: flex;
    gap: 12px;
    margin-bottom: 32px;
    justify-content: center;
    align-items: center;
}

.ir-search input {
    flex: 1;
    max-width: 560px;
    padding: 14px 20px;
    border: 1px solid var(--color-gray-300);
    border-radius: 50px;
    font-size: 15px;
    font-family: inherit;
    outline: none;
    transition: border-color var(--transition-fast);
    background: var(--color-gray-50);
}

.ir-search input:focus {
    border-color: var(--color-primary);
    background: var(--color-white);
}

.ir-search button {
    width: 48px;
    height: 48px;
    padding: 0;
    background: var(--color-primary);
    color: var(--color-white);
    border: none;
    border-radius: 50%;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.ir-search button svg {
    width: 20px;
    height: 20px;
}

/* IR Table */
.ir-table {
    width: 100%;
    border-collapse: collapse;
}

.ir-table thead {
    background: var(--color-gray-50);
    border-top: 2px solid var(--color-gray-900);
}

.ir-table th {
    padding: 14px 16px;
    font-size: 13px;
    font-weight: 600;
    color: var(--color-gray-600);
    text-align: left;
    border-bottom: 1px solid var(--color-gray-200);
}

.ir-table td {
    padding: 16px;
    font-size: 14px;
    color: var(--color-gray-700);
    border-bottom: 1px solid var(--color-gray-100);
}

.ir-table tbody tr {
    transition: background var(--transition-fast);
}

.ir-table tbody tr:hover {
    background: var(--color-gray-50);
}

.ir-table .ir-title-cell {
    font-weight: 500;
    color: var(--color-gray-900);
    cursor: pointer;
}

.ir-table .ir-title-cell:hover {
    color: var(--color-primary);
}

.ir-table .ir-category {
    display: inline-block;
    font-size: 12px;
    font-weight: 500;
    color: var(--color-primary);
    background: var(--color-primary-50);
    padding: 2px 10px;
    border-radius: var(--radius-full);
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    gap: 4px;
    margin-top: 40px;
}

.page-btn {
    min-width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-gray-600);
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.page-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.page-btn.active {
    background: var(--color-primary);
    color: var(--color-white);
    border-color: var(--color-primary);
}


/* ============================================================
   CONTACT PAGE
   ============================================================ */
.contact-page-section {
    padding: 80px 0;
}

.contact-page-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

/* Contact Info Cards */
.contact-info-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.contact-info-card {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 24px;
    background: var(--color-bg-alt);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-md);
}

.contact-info-icon {
    width: 44px;
    height: 44px;
    background: var(--color-primary-50);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 18px;
}

.contact-info-text h4 {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-gray-400);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 4px;
}

.contact-info-text p,
.contact-info-text a {
    font-size: 15px;
    font-weight: 500;
    color: var(--color-gray-800);
}

.contact-info-text a:hover {
    color: var(--color-primary);
}

/* Contact Form */
.contact-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.contact-form h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 8px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-gray-600);
}

.form-group input,
.form-group textarea,
.form-group select {
    padding: 12px 16px;
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-family: inherit;
    outline: none;
    transition: border-color var(--transition-fast);
    background: var(--color-white);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-50);
}

.form-group textarea {
    min-height: 140px;
    resize: vertical;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--color-gray-400);
}

.contact-map {
    margin-top: 32px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--color-gray-200);
    height: 300px;
}

.contact-map iframe {
    width: 100%;
    height: 100%;
    border: none;
}


/* ============================================================
   FOOTER
   ============================================================ */
/* ===== Footer (Premium - Upbit/Toss Style) ===== */
.footer {
    background: var(--color-gray-900);
    color: var(--color-gray-400);
    padding: 0;
}

.footer-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 32px;
}

/* Footer Top: Logo + Nav */
.footer-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 32px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.footer-logo-text {
    font-family: 'Noto Sans KR', sans-serif;
    font-size: 20px;
    font-weight: 800;
    color: var(--color-white);
    letter-spacing: -0.5px;
}

.footer-nav {
    display: flex;
    align-items: center;
    gap: 32px;
}

.footer-nav a {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-gray-400);
    transition: color 0.2s;
}

.footer-nav a:hover {
    color: var(--color-white);
}

/* Footer Info Grid */
.footer-info-grid {
    display: flex;
    gap: 48px;
    padding: 28px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    flex-wrap: wrap;
}

.footer-info-col {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.footer-info-item {
    font-size: 13px;
    color: var(--color-gray-500);
    line-height: 1.5;
}

.footer-info-item a {
    color: var(--color-gray-500);
    transition: color 0.2s;
}

.footer-info-item a:hover {
    color: var(--color-white);
}

.footer-info-label {
    color: var(--color-gray-500);
    margin-right: 6px;
}

/* Footer Bottom: Copyright + Legal */
.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 24px 0;
}

.copyright {
    font-size: 13px;
    color: var(--color-gray-500);
}

.footer-legal-links {
    display: flex;
    gap: 24px;
}

.footer-legal-links a {
    font-size: 13px;
    color: var(--color-gray-500);
    font-weight: 500;
    transition: color 0.2s;
}

.footer-legal-links a:hover {
    color: var(--color-white);
}

/* Legacy footer classes (for subpages) */
.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 48px;
    padding: 48px 0 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-description {
    font-size: 14px;
    line-height: 1.7;
    color: var(--color-gray-400);
}

.footer-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: 16px;
}

.footer-address p {
    font-size: 14px;
    line-height: 1.7;
    color: var(--color-gray-400);
}

.footer-contact {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 4px 12px;
}

.footer-contact-label {
    font-size: 12px;
    font-weight: 600;
    color: var(--color-gray-500);
    text-transform: uppercase;
}

.footer-contact dd {
    font-size: 14px;
    color: var(--color-gray-400);
}

.footer-contact dd a {
    color: var(--color-gray-400);
}

.footer-contact dd a:hover {
    color: var(--color-white);
}

.footer-legal li {
    margin-bottom: 8px;
}

.footer-legal li a {
    font-size: 14px;
    color: var(--color-gray-400);
}

.footer-legal li a:hover {
    color: var(--color-white);
}

.footer-legal .ceo-info,
.footer-legal .business-info {
    font-size: 13px;
    color: var(--color-gray-500);
}


/* ============================================================
   RESPONSIVE DESIGN
   ============================================================ */
@media (max-width: 1024px) {
    :root {
        --section-gap: 80px;
    }

    .company-grid,
    .ceo-grid,
    .contact-page-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .products-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .research-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .research-grid .research-card:last-child {
        grid-column: span 2;
    }

    .product-detail {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .product-detail.reverse {
        direction: ltr;
    }

    .project-grid {
        grid-template-columns: 1fr;
    }

    .cert-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }

    .footer-top {
        flex-direction: column;
        gap: 20px;
        align-items: flex-start;
    }

    .footer-nav {
        gap: 20px;
        flex-wrap: wrap;
    }

    .footer-info-grid {
        flex-direction: column;
        gap: 20px;
    }

    .info-grid {
        grid-template-columns: 1fr;
    }

    .vision-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 64px;
        --section-gap: 64px;
    }

    .navigation {
        display: none;
    }

    .hamburger {
        display: flex;
    }

    .mobile-menu {
        display: block;
    }

    .hero-slider {
        height: 100vh;
    }

    .slide-content {
        padding: 0 0 16vh 24px;
    }

    .slide-subtitle {
        display: none;
    }

    .slider-control.prev { right: 92px; left: auto; }
    .slider-control.next { right: 24px; left: auto; }
    .slider-indicators { right: 20px; }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }

    .stat-item::after {
        display: none;
    }

    .stat-number {
        font-size: 36px;
    }

    .products-grid,
    .research-grid {
        grid-template-columns: 1fr;
    }

    .research-image {
        height: 280px;
    }

    .research-grid .research-card:last-child {
        grid-column: span 1;
    }

    .page-hero-title {
        font-size: 28px;
    }

    .section-title {
        font-size: 26px;
    }

    .company-section,
    .products-section,
    .research-section,
    .ir-section {
        padding: 80px 0;
    }

    .contact-section {
        padding: 80px 0;
    }

    .contact-info {
        flex-direction: column;
        gap: 20px;
        align-items: center;
    }

    .contact-content .section-title {
        font-size: 26px;
        margin-bottom: 36px;
    }

    .footer-top {
        padding: 24px 0;
    }

    .footer-nav {
        gap: 16px;
    }

    .footer-nav a {
        font-size: 13px;
    }

    .footer-info-grid {
        gap: 16px;
        padding: 20px 0;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 12px;
        align-items: center;
        padding: 20px 0;
        text-align: center;
    }

    .footer-legal-links {
        gap: 16px;
    }

    .cert-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .slider-control {
        width: 44px;
        height: 44px;
    }

    .slider-control.prev { right: 72px; left: auto; }
    .slider-control.next { right: 16px; left: auto; }

    .sub-nav-container {
        overflow-x: auto;
        justify-content: flex-start;
        -webkit-overflow-scrolling: touch;
    }

    .sub-nav-item {
        padding: 16px 20px;
        font-size: 14px;
    }

    .timeline::before {
        left: 20px;
    }

    .timeline-item {
        flex-direction: column;
        align-items: flex-start;
        padding-left: 44px;
    }

    .timeline-year {
        text-align: left;
        padding-right: 0;
        font-size: 16px;
    }

    .timeline-dot {
        position: absolute;
        left: 15px;
        top: 4px;
    }

    .timeline-content {
        padding-left: 0;
    }

    .directions-info-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }

    .directions-map-buttons {
        flex-direction: column;
        align-items: center;
    }

    .map-nav-btn {
        width: 200px;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .header-container {
        padding: 0 16px;
    }

    .container {
        padding: 0 16px;
    }

    .hero-slider {
        height: 100vh;
    }

    .slide-content {
        padding: 0 0 14vh 16px;
    }

    .slide-cta {
        flex-direction: column;
        width: 100%;
        max-width: 280px;
    }

    .slide-cta .btn {
        width: 100%;
    }

    .slider-control { width: 44px; height: 44px; }
    .slider-control.prev { right: 64px; left: auto; }
    .slider-control.next { right: 12px; left: auto; }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .stat-number {
        font-size: 28px;
    }

    .page-hero {
        padding: 48px 0;
    }

    .page-hero-title {
        font-size: 24px;
    }

    .nav-menu {
        gap: 24px;
    }

    .cert-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}


/* ============================================================
   LAYER POPUPS
   ============================================================ */
.popup-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: 9998;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.popup-overlay.active {
    display: block;
    opacity: 1;
}

.popup-container {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 9999;
    pointer-events: none;
}

.layer-popup {
    position: absolute;
    top: calc(var(--header-height) + 24px);
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.2);
    overflow: hidden;
    pointer-events: all;
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.layer-popup-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 4px 0 16px;
    background: var(--color-white);
    min-height: 8px;
}

.layer-popup-title {
    font-size: 0;
    color: transparent;
}

.layer-popup-close {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: var(--color-gray-400);
    cursor: pointer;
    border-radius: 50%;
    transition: background var(--transition-fast);
    position: absolute;
    top: 4px;
    right: 4px;
    z-index: 2;
    background: rgba(255,255,255,0.8);
}

.layer-popup-close:hover {
    background: var(--color-gray-100);
    color: var(--color-gray-700);
}

.layer-popup-body {
    line-height: 0;
}

.layer-popup-body img {
    width: 100%;
    display: block;
}

.layer-popup-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    background: var(--color-gray-800);
}

.layer-popup-hide-label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: 13px;
    color: var(--color-gray-300);
}

.layer-popup-hide-check {
    width: 14px;
    height: 14px;
    cursor: pointer;
}

.layer-popup-close-btn {
    font-size: 13px;
    font-weight: 500;
    color: var(--color-gray-300);
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
    transition: color var(--transition-fast);
}

.layer-popup-close-btn:hover {
    color: var(--color-white);
}

@media (max-width: 768px) {
    .layer-popup {
        position: fixed !important;
        left: 16px !important;
        right: 16px !important;
        top: 50% !important;
        transform: translateY(-50%) !important;
        width: auto !important;
        max-height: 80vh;
        overflow-y: auto;
    }

    .layer-popup + .layer-popup {
        display: none;
    }
}