/* ============================================================
   SDSA — Consolidated Stylesheet
   Extracted from: index.html, about.html, cases.html,
   learning.html, the_strata_journal.html, nav.html
   ============================================================ */

/* ── RESET & VARIABLES ── */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --primary-dark: #1a2332;
    --secondary-dark: #2C3E50;
    --accent-copper: #D4916A;
    --accent-light: #E8A276;
    --text-gray: #5D6D7E;
    --light-bg: #F0EDEA;
    --white: #FFFFFF;
    --off-white: #FAFAF8;
}

body {
    font-family: 'DM Sans', sans-serif;
    color: var(--primary-dark);
    background: var(--off-white);
}


/* ============================================================
   NAV (shared across all pages)
   ============================================================ */
nav {
    background: var(--primary-dark);
    padding: 0.8rem 0;
    position: sticky; top: 0; z-index: 1000;
    border-bottom: 3px solid var(--accent-copper);
}
.nav-container {
    max-width: 1200px; margin: 0 auto; padding: 0 2rem;
    display: grid; grid-template-columns: 1fr auto 1fr; align-items: center;
}
.logo { height: 44px; width: auto; }
.nav-page-title {
    font-family: 'DM Sans', sans-serif;
    color: var(--accent-copper);
    font-size: 0.8rem; font-weight: 700;
    letter-spacing: 6px; text-transform: uppercase;
    text-align: center;
}
.hamburger {
    background: none; border: none; cursor: pointer;
    display: flex; flex-direction: column; justify-content: center;
    gap: 6px; padding: 8px; z-index: 1100; margin-left: auto;
}
.hamburger span {
    display: block; width: 28px; height: 2.5px; background: var(--accent-copper);
    transition: all 0.3s ease; transform-origin: center;
}
.hamburger.active span:nth-child(1) { transform: translateY(8.5px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-8.5px) rotate(-45deg); }

/* Sidebar Overlay */
.nav-overlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.6); opacity: 0; visibility: hidden;
    transition: all 0.3s ease; z-index: 1001;
}
.nav-overlay.active { opacity: 1; visibility: visible; }

/* Slide-in Sidebar */
.nav-sidebar {
    position: fixed; top: 0; right: 0; width: 320px; max-width: 80vw;
    height: 100%; background: var(--primary-dark);
    transform: translateX(100%); transition: transform 0.35s cubic-bezier(0.4,0,0.2,1);
    z-index: 1002; display: flex; flex-direction: column;
    padding: 5rem 2.5rem 2rem; border-left: 3px solid var(--accent-copper);
}
.nav-sidebar.active { transform: translateX(0); }

.sidebar-close {
    position: absolute; top: 1.2rem; right: 1.5rem;
    background: none; border: none; cursor: pointer; padding: 8px;
}
.sidebar-close svg { width: 22px; height: 22px; stroke: var(--accent-copper); stroke-width: 2.5; }
.sidebar-close:hover svg { stroke: #fff; }

.sidebar-accent {
    width: 50px; height: 3px; background: var(--accent-copper);
    margin-bottom: 2rem;
}
.nav-sidebar .nav-links { list-style: none; display: flex; flex-direction: column; }
.nav-sidebar .nav-links li { border-bottom: 1px solid rgba(212,145,106,0.15); }
.nav-sidebar .nav-links li:last-child { border-bottom: none; }
.nav-sidebar .nav-links a {
    color: #fff; text-decoration: none; font-weight: 500; font-size: 1.1rem;
    letter-spacing: 2px; text-transform: uppercase; display: block;
    padding: 1.1rem 0.5rem; transition: all 0.2s ease;
}
.nav-sidebar .nav-links a:hover { color: var(--accent-copper); padding-left: 1.2rem; }


/* ============================================================
   SHARED COMPONENTS
   ============================================================ */
.container { max-width: 1100px; margin: 0 auto; padding: 0 2rem; }

.section-title-bar {
    display: flex; align-items: center; gap: 1.5rem; margin-bottom: 3.5rem;
}
.section-title-bar .line { flex: 1; height: 3px; background: var(--accent-copper); }
.section-title-bar h2 {
    font-family: 'DM Serif Display', serif;
    font-size: 2.5rem; color: var(--primary-dark); white-space: nowrap;
}

/* Buttons */
.btn {
    display: inline-block; padding: 0.9rem 2.2rem;
    background: var(--accent-copper); color: var(--white);
    text-decoration: none; font-weight: 700; font-size: 0.85rem;
    letter-spacing: 2px; text-transform: uppercase;
    transition: all 0.3s ease; border: none; cursor: pointer;
}
.btn:hover { background: var(--accent-light); transform: translateY(-2px); }
.btn-secondary {
    background: transparent; border: 2px solid var(--accent-copper);
    color: var(--accent-copper);
}
.btn-secondary:hover { background: var(--accent-copper); color: #fff; }
.btn-dark {
    background: var(--primary-dark); color: var(--white);
}
.btn-dark:hover { background: var(--secondary-dark); }

/* CTA Section (used on index + cases) */
.cta-section { padding: 5rem 0; background: var(--off-white); }
.cta-box {
    background: var(--primary-dark); color: var(--white);
    padding: 4rem; text-align: center; position: relative;
    clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), 0 100%);
}
.cta-box h3 {
    font-family: 'DM Serif Display', serif;
    font-size: 2rem; margin-bottom: 1rem;
}
.cta-box p { font-size: 1.1rem; opacity: 0.8; margin-bottom: 2rem; }

/* Animations (about page) */
.fade-up.hidden {
    opacity: 0; transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-up.visible {
    opacity: 1; transform: translateY(0);
    transition: opacity 0.6s ease, transform 0.6s ease;
}


/* ============================================================
   FOOTER (shared across all pages)
   ============================================================ */
footer {
    background: var(--primary-dark); color: var(--white);
    padding: 2.5rem 2rem; text-align: center;
    border-top: 3px solid var(--accent-copper);
}
footer .footer-inner {
    max-width: 1100px; margin: 0 auto;
    display: flex; flex-direction: column; align-items: center; gap: 1.2rem;
}
footer .footer-links {
    display: flex; gap: 1.5rem; align-items: center;
}
footer .footer-links a {
    color: rgba(255,255,255,0.5); transition: color 0.2s ease;
    display: flex; align-items: center;
}
footer .footer-links a:hover { color: var(--accent-copper); }
footer .footer-links svg { width: 20px; height: 20px; }
footer .footer-copy {
    opacity: 0.4; font-size: 0.8rem; letter-spacing: 2px; text-transform: uppercase;
}


/* ============================================================
   INDEX PAGE — Hero
   ============================================================ */
.hero {
    background: var(--primary-dark);
    color: var(--white);
    padding: 4rem 2rem 5rem;
    position: relative;
    overflow: hidden;
}
.hero::after {
    content: '';
    position: absolute; bottom: -2px; left: 0; right: 0;
    height: 80px;
    background: var(--off-white);
    clip-path: polygon(0 100%, 100% 0, 100% 100%);
}
.hero-content {
    max-width: 900px; margin: 0 auto; text-align: center; position: relative; z-index: 1;
}
.hero-content svg { max-width: 700px; width: 100%; height: auto; }
.hero-stat-bar {
    display: flex; justify-content: center; gap: 3rem; margin-top: 3rem;
    position: relative; z-index: 1;
}
.hero-stat { text-align: center; }
.hero-stat .num {
    font-family: 'DM Serif Display', serif;
    font-size: 2.5rem; color: var(--accent-copper); line-height: 1;
}
.hero-stat .label {
    font-size: 0.7rem; letter-spacing: 3px; text-transform: uppercase;
    opacity: 0.6; margin-top: 0.5rem;
}

/* INDEX — Mission */
.mission-section { padding: 6rem 0; background: var(--off-white); }
.mission-grid {
    display: grid; grid-template-columns: auto 1fr; gap: 3rem; align-items: start;
}
.mission-tag {
    writing-mode: vertical-rl;
    font-size: 0.7rem; letter-spacing: 5px; text-transform: uppercase;
    color: var(--accent-copper); font-weight: 700;
    border-right: 3px solid var(--accent-copper); padding-right: 1rem;
}
.mission-text h2 {
    font-family: 'DM Serif Display', serif;
    font-size: 2.8rem; line-height: 1.2; color: var(--primary-dark);
    margin-bottom: 2rem;
}
.mission-text p {
    font-size: 1.1rem; line-height: 1.9; color: var(--text-gray);
    max-width: 650px; margin-bottom: 1rem;
}

/* INDEX — Explore */
.explore-section { padding: 6rem 0; background: var(--light-bg); }
.explore-title-bar {
    display: flex; align-items: center; gap: 1.5rem; margin-bottom: 3.5rem;
}
.explore-title-bar .line { flex: 1; height: 3px; background: var(--accent-copper); }
.explore-title-bar h2 {
    font-family: 'DM Serif Display', serif;
    font-size: 2.5rem; color: var(--primary-dark); white-space: nowrap;
}
.explore-stack { display: flex; flex-direction: column; gap: 0; }
.explore-item {
    display: grid; grid-template-columns: 100px 1fr auto;
    align-items: center;
    border-bottom: 1px solid rgba(26,35,50,0.1);
    padding: 2.5rem 0;
    transition: background 0.3s ease;
    text-decoration: none;
}
.explore-item:hover { background: rgba(212,145,106,0.04); }
.explore-item:first-child { border-top: 3px solid var(--primary-dark); }
.explore-item .item-num {
    font-family: 'DM Serif Display', serif;
    font-size: 3rem; color: var(--accent-copper); opacity: 0.3;
    line-height: 1;
}
.explore-item h3 {
    font-family: 'DM Serif Display', serif;
    font-size: 1.5rem; color: var(--primary-dark); margin-bottom: 0.5rem;
}
.explore-item p {
    font-size: 1.05rem; line-height: 1.7; color: var(--text-gray); max-width: 550px;
}
.explore-cta {
    font-size: 0.8rem; font-weight: 700; letter-spacing: 2px;
    text-transform: uppercase; color: var(--accent-copper);
    white-space: nowrap; padding-left: 2rem;
}
.explore-item:hover .explore-cta { color: var(--primary-dark); }


/* ============================================================
   ABOUT PAGE
   ============================================================ */
/* About Hero (variant with left-aligned content + geometric blocks) */
.hero-blocks {
    position: absolute; top: 0; left: 0; right: 0; bottom: 0;
    pointer-events: none; overflow: hidden;
}
.hero-blocks .block {
    position: absolute; border: 1px solid rgba(212,145,106,0.08);
}
.hero-blocks .b1 { width: 260px; height: 260px; top: -5%; right: 8%; transform: rotate(20deg); }
.hero-blocks .b2 { width: 150px; height: 150px; bottom: 15%; left: 2%; transform: rotate(-12deg); }
.hero-blocks .b3 { width: 90px; height: 90px; top: 25%; left: 20%; border-color: rgba(255,255,255,0.04); }
.hero-blocks .b4 { width: 180px; height: 180px; bottom: 5%; right: 15%; transform: rotate(8deg); border-color: rgba(255,255,255,0.03); }

.hero-label {
    font-size: 0.75rem; font-weight: 700; letter-spacing: 5px;
    text-transform: uppercase; color: var(--accent-copper);
    margin-bottom: 1.5rem;
}
.hero-content h1 {
    font-family: 'DM Serif Display', serif;
    font-size: 3.5rem; line-height: 1.15;
    margin-bottom: 1.5rem;
}
.hero-content h1 span { color: var(--accent-copper); }
.hero-content p {
    font-size: 1.15rem; line-height: 1.9; opacity: 0.75;
    max-width: 620px;
}

/* About — What We Do */
.wwd-section { padding: 6rem 0; background: var(--off-white); }
.wwd-stack { display: flex; flex-direction: column; gap: 0; }
.wwd-item {
    display: grid; grid-template-columns: 100px 1fr;
    border-bottom: 1px solid rgba(26,35,50,0.1);
    padding: 2.5rem 0;
    transition: background 0.3s ease;
}
.wwd-item:hover { background: rgba(212,145,106,0.04); }
.wwd-item:first-child { border-top: 3px solid var(--primary-dark); }
.wwd-item .item-num {
    font-family: 'DM Serif Display', serif;
    font-size: 3rem; color: var(--accent-copper); opacity: 0.3;
    line-height: 1;
}
.wwd-item h3 {
    font-family: 'DM Serif Display', serif;
    font-size: 1.5rem; color: var(--primary-dark); margin-bottom: 0.8rem;
}
.wwd-item p {
    font-size: 1.05rem; line-height: 1.8; color: var(--text-gray); max-width: 700px;
}

/* About — What Makes Us Different */
.diff-section { padding: 6rem 0; background: var(--light-bg); }
.diff-grid { display: flex; flex-direction: column; align-items: flex-start; }
.diff-tag {
    font-size: 0.7rem; letter-spacing: 5px; text-transform: uppercase;
    color: var(--accent-copper); font-weight: 700;
    border-bottom: 3px solid var(--accent-copper); padding-bottom: 0.5rem;
    margin-bottom: 1rem;
}
.diff-content h2 {
    font-family: 'DM Serif Display', serif;
    font-size: 2.8rem; line-height: 1.2; color: var(--primary-dark);
    margin-bottom: 2rem;
}
.diff-content p {
    font-size: 1.1rem; line-height: 1.9; color: var(--text-gray);
    max-width: 650px; margin-bottom: 1.2rem;
}
.diff-content p:last-child { margin-bottom: 0; }
.diff-content strong { color: var(--primary-dark); font-weight: 700; }

/* About — Case Competition Callout */
.case-section { padding: 5rem 0; background: var(--off-white); }
.case-banner {
    background: var(--primary-dark);
    color: var(--white);
    display: grid; grid-template-columns: auto 1fr;
    overflow: hidden;
    position: relative;
}
.case-accent { width: 8px; background: var(--accent-copper); }
.case-inner { padding: 3.5rem 3rem; }
.case-label {
    font-size: 0.7rem; font-weight: 700; letter-spacing: 5px;
    text-transform: uppercase; color: var(--accent-copper);
    margin-bottom: 1rem;
}
.case-inner h3 {
    font-family: 'DM Serif Display', serif;
    font-size: 2rem; margin-bottom: 1rem;
}
.case-inner p {
    font-size: 1.05rem; line-height: 1.8; opacity: 0.75;
    max-width: 600px; margin-bottom: 2rem;
}
.case-inner .btn {
    display: inline-block; padding: 0.85rem 2rem;
    background: var(--accent-copper); color: var(--white);
    text-decoration: none; font-weight: 700; font-size: 0.8rem;
    letter-spacing: 2px; text-transform: uppercase;
    transition: all 0.3s ease; border: none; cursor: pointer;
}
.case-inner .btn:hover { background: var(--accent-light); transform: translateY(-2px); }
.case-geo {
    position: absolute; right: 3rem; top: 50%; transform: translateY(-50%);
    width: 120px; height: 120px; border: 2px solid rgba(212,145,106,0.15);
    transform: translateY(-50%) rotate(15deg);
    pointer-events: none;
}

/* About — Get Involved */
.involve-section { padding: 6rem 0; background: var(--light-bg); }
.involve-grid {
    display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: start;
}
.involve-text h2 {
    font-family: 'DM Serif Display', serif;
    font-size: 2.8rem; line-height: 1.2; color: var(--primary-dark);
    margin-bottom: 2rem;
}
.involve-text p {
    font-size: 1.1rem; line-height: 1.9; color: var(--text-gray);
    margin-bottom: 1.5rem;
}
.involve-cta { display: flex; gap: 1rem; flex-wrap: wrap; margin-top: 2rem; }
.involve-details { border-left: 3px solid var(--accent-copper); padding-left: 2rem; }
.involve-detail-item { margin-bottom: 2rem; }
.involve-detail-item:last-child { margin-bottom: 0; }
.involve-detail-item h4 {
    font-family: 'DM Serif Display', serif;
    font-size: 1.2rem; color: var(--primary-dark); margin-bottom: 0.5rem;
}
.involve-detail-item p {
    font-size: 0.95rem; line-height: 1.7; color: var(--text-gray);
}


/* ============================================================
   CASES PAGE
   ============================================================ */
.hero-icon {
    display: flex; align-items: center; justify-content: center; gap: 1.5rem;
    margin-bottom: 1.5rem;
}
.hero h1 {
    font-family: 'DM Serif Display', serif;
    font-size: 3.2rem; font-weight: 400; letter-spacing: 2px; line-height: 1.1;
}
.hero .subtitle {
    font-size: 0.8rem; font-weight: 500;
    letter-spacing: 5px; text-transform: uppercase;
    color: var(--accent-copper); margin-top: 1rem;
}

/* Cases — Intro */
.intro-section { padding: 6rem 0; background: var(--off-white); }
.intro-grid {
    display: grid; grid-template-columns: auto 1fr; gap: 3rem; align-items: start;
}
.intro-tag {
    writing-mode: vertical-rl;
    font-size: 0.7rem; letter-spacing: 5px; text-transform: uppercase;
    color: var(--accent-copper); font-weight: 700;
    border-right: 3px solid var(--accent-copper); padding-right: 1rem;
}
.intro-text h2 {
    font-family: 'DM Serif Display', serif;
    font-size: 2.5rem; line-height: 1.2; color: var(--primary-dark);
    margin-bottom: 1.5rem;
}
.intro-text p {
    font-size: 1.05rem; line-height: 1.9; color: var(--text-gray);
    max-width: 650px;
}

/* Cases — Cards */
.cases-section { padding: 6rem 0; background: var(--light-bg); }
.cases-title-bar {
    display: flex; align-items: center; gap: 1.5rem; margin-bottom: 3.5rem;
}
.cases-title-bar .line { flex: 1; height: 3px; background: var(--accent-copper); }
.cases-title-bar h2 {
    font-family: 'DM Serif Display', serif;
    font-size: 2.5rem; color: var(--primary-dark); white-space: nowrap;
}
.cases-stack { display: flex; flex-direction: column; gap: 0; }
.case-card {
    display: grid; grid-template-columns: 100px 1fr;
    border-bottom: 1px solid rgba(26,35,50,0.1);
    padding: 2.5rem 0;
    transition: background 0.3s ease;
}
.case-card:first-child { border-top: 3px solid var(--primary-dark); }
.case-card:hover { background: rgba(212,145,106,0.04); }
.case-num {
    font-family: 'DM Serif Display', serif;
    font-size: 3rem; color: var(--accent-copper); opacity: 0.3;
    line-height: 1;
}
.case-content h3 {
    font-family: 'DM Serif Display', serif;
    font-size: 1.6rem; color: var(--primary-dark); margin-bottom: 0.6rem;
}
.case-tags { display: flex; gap: 0.6rem; flex-wrap: wrap; margin-bottom: 1rem; }
.case-tag {
    font-size: 0.7rem; font-weight: 700; letter-spacing: 2px; text-transform: uppercase;
    color: var(--accent-copper); padding: 0.3rem 0.8rem;
    border: 1.5px solid var(--accent-copper); display: inline-block;
}
.case-partnership {
    display: flex; align-items: center; gap: 0.5rem;
    margin-bottom: 1rem; padding: 0.75rem 1rem;
    border-left: 3px solid var(--accent-copper);
    background: rgba(212,145,106,0.05);
}
.case-partnership span {
    font-size: 0.9rem; color: var(--text-gray); font-style: italic;
}
.case-content p {
    font-size: 1.05rem; line-height: 1.8; color: var(--text-gray); max-width: 700px;
    margin-bottom: 1.2rem;
}
.case-date {
    font-size: 0.75rem; letter-spacing: 3px; text-transform: uppercase;
    color: var(--text-gray); opacity: 0.6; margin-bottom: 1.2rem;
}
.case-card.coming-soon {
    opacity: 0.5;
    border-left: 3px dashed var(--accent-copper);
    padding-left: 1.5rem;
}
.case-card.coming-soon .case-num { opacity: 0.15; }
.case-card.coming-soon h3 { color: var(--text-gray); }


/* ============================================================
   LEARNING PAGE
   ============================================================ */
/* Page Header (shared with journal) */
.page-header {
    background: var(--primary-dark);
    color: var(--white);
    padding: 4rem 2rem 5rem;
    position: relative;
    overflow: hidden;
}
.page-header::after {
    content: '';
    position: absolute; bottom: -2px; left: 0; right: 0;
    height: 80px;
    background: var(--off-white);
    clip-path: polygon(0 100%, 100% 0, 100% 100%);
}
.page-header-blocks {
    position: absolute; top: 0; left: 0; right: 0; bottom: 0;
    pointer-events: none; overflow: hidden;
}
.page-header-blocks .block {
    position: absolute; border: 1px solid rgba(212,145,106,0.1);
}
.page-header-blocks .b1 { width: 180px; height: 180px; top: 8%; right: 8%; transform: rotate(12deg); }
.page-header-blocks .b2 { width: 100px; height: 100px; bottom: 25%; left: 5%; transform: rotate(-8deg); }
.page-header-blocks .b3 { width: 60px; height: 60px; top: 35%; left: 20%; border-color: rgba(255,255,255,0.05); }
.page-header-content {
    max-width: 900px; margin: 0 auto; text-align: center; position: relative; z-index: 1;
}
.page-header-content h1 {
    font-family: 'DM Serif Display', serif;
    font-size: 3.5rem; font-weight: 400; letter-spacing: 2px;
    margin-bottom: 1rem;
}
.page-header-content .header-line {
    width: 80px; height: 3px; background: var(--accent-copper);
    margin: 0 auto 1.5rem;
}
.page-header-content p {
    font-size: 1.15rem; line-height: 1.8; opacity: 0.7;
    max-width: 550px; margin: 0 auto;
}

/* Learning Sections */
.learning-sections { padding: 5rem 0 6rem; background: var(--off-white); }
.section-block { margin-bottom: 4rem; }
.section-block:last-child { margin-bottom: 0; }

.section-header {
    display: flex; align-items: center; gap: 1.5rem;
    margin-bottom: 2rem;
}
.section-num {
    font-family: 'DM Serif Display', serif;
    font-size: 4rem; line-height: 1; color: var(--accent-copper); opacity: 0.2;
    flex-shrink: 0;
}
.section-header-text h2 {
    font-family: 'DM Serif Display', serif;
    font-size: 2rem; color: var(--primary-dark); line-height: 1.2;
}
.section-header-text .section-label {
    font-size: 0.7rem; letter-spacing: 4px; text-transform: uppercase;
    color: var(--accent-copper); font-weight: 700; margin-bottom: 0.3rem;
}

/* Section Cards */
.section-card {
    background: var(--white);
    border-top: 3px solid var(--primary-dark);
    padding: 2.5rem 3rem;
    position: relative;
    transition: box-shadow 0.3s ease;
}
.section-card:hover { box-shadow: 0 8px 30px rgba(26,35,50,0.08); }
.section-card::before {
    content: '';
    position: absolute; top: 0; left: 0;
    width: 4px; height: 100%;
    background: var(--accent-copper);
}
.section-card p.section-desc {
    font-size: 1.05rem; line-height: 1.8; color: var(--text-gray);
    max-width: 700px; margin-bottom: 2rem;
}

/* Category groups */
.category-group {
    border-top: 1px solid rgba(26,35,50,0.08);
    padding-top: 1.5rem; margin-top: 1.5rem;
}
.category-group:first-of-type { border-top: none; padding-top: 0; margin-top: 0; }
.category-title {
    font-family: 'DM Serif Display', serif;
    font-size: 1.15rem; color: var(--primary-dark); margin-bottom: 0.3rem;
}
.category-topics {
    font-size: 0.9rem; color: var(--text-gray); line-height: 1.7;
    margin-bottom: 1rem;
}

/* Section Links */
.section-links { display: flex; flex-wrap: wrap; gap: 0.8rem; margin-top: 2rem; }
.section-link {
    display: inline-flex; align-items: center; gap: 0.6rem;
    padding: 0.75rem 1.6rem;
    background: var(--primary-dark); color: var(--white);
    text-decoration: none; font-weight: 700; font-size: 0.78rem;
    letter-spacing: 2px; text-transform: uppercase;
    transition: all 0.3s ease; border: none;
}
.section-link:hover { background: var(--accent-copper); transform: translateY(-2px); }
.section-link svg {
    width: 14px; height: 14px; stroke: currentColor; stroke-width: 2.5;
    fill: none; flex-shrink: 0;
}
.section-link.primary { background: var(--accent-copper); color: var(--white); }
.section-link.primary:hover { background: var(--accent-light); }

.module-badge {
    display: inline-block;
    font-size: 0.65rem; font-weight: 700; letter-spacing: 2px; text-transform: uppercase;
    color: var(--accent-copper); background: rgba(212,145,106,0.1);
    padding: 0.3rem 0.8rem; margin-bottom: 1.5rem;
}


/* ============================================================
   THE STRATA JOURNAL PAGE
   ============================================================ */
/* Journal Header (variant) */
.header-blocks { display: none; }
.header-content {
    max-width: 1100px; margin: 0 auto; position: relative; z-index: 1;
    display: grid; grid-template-columns: auto 1fr; gap: 3rem; align-items: center;
}
.header-icon { display: flex; flex-direction: column; align-items: center; gap: 0.5rem; }
.header-tag {
    font-size: 0.65rem; letter-spacing: 4px; text-transform: uppercase;
    color: var(--accent-copper); font-weight: 700;
}
.header-text h1 {
    font-family: 'DM Serif Display', serif;
    font-size: 3.5rem; line-height: 1.1; margin-bottom: 1rem;
}
.header-text p {
    font-size: 1.1rem; opacity: 0.75; max-width: 600px; line-height: 1.7;
}

/* Category Filter Tabs */
.filter-bar {
    background: var(--light-bg);
    border-bottom: 3px solid rgba(212,145,106,0.2);
    padding: 0;
}
.filter-container {
    max-width: 1400px; margin: 0 auto; padding: 0 2rem;
    display: flex; gap: 0; flex-wrap: wrap;
}
.filter-tab {
    padding: 1rem 1.5rem;
    font-size: 0.75rem; font-weight: 700; letter-spacing: 2px; text-transform: uppercase;
    color: var(--text-gray); cursor: pointer; border: none; background: none;
    border-bottom: 3px solid transparent; margin-bottom: -3px;
    white-space: nowrap; transition: all 0.2s ease;
    font-family: 'DM Sans', sans-serif;
}
.filter-tab:hover { color: var(--primary-dark); }
.filter-tab.active {
    color: var(--accent-copper);
    border-bottom-color: var(--accent-copper);
}

/* Recent Section */
.recent-section { padding: 5rem 0 4rem; background: var(--off-white); }

/* Featured Article */
.featured-article {
    display: grid;
    grid-template-columns: 1fr 1fr;
    background: var(--white);
    border-left: 5px solid var(--accent-copper);
    margin-bottom: 2rem;
    transition: all 0.3s ease;
    text-decoration: none; color: inherit;
    overflow: hidden;
}
.featured-article:hover {
    box-shadow: 0 8px 32px rgba(26, 35, 50, 0.1);
    transform: translateY(-3px);
}
.featured-article-body { padding: 2.5rem; }
.featured-label {
    font-size: 0.65rem; letter-spacing: 4px; text-transform: uppercase;
    color: var(--accent-copper); font-weight: 700; margin-bottom: 1rem;
    display: block;
}
.featured-article h3 {
    font-family: 'DM Serif Display', serif;
    font-size: 2rem; line-height: 1.2; color: var(--primary-dark);
    margin-bottom: 1rem;
}
.featured-article p {
    font-size: 1rem; line-height: 1.8; color: var(--text-gray); margin-bottom: 1.5rem;
}
.article-meta {
    display: flex; align-items: center; gap: 1rem; flex-wrap: wrap;
}
.cat-tag {
    font-size: 0.7rem; letter-spacing: 2px; text-transform: uppercase;
    font-weight: 700; padding: 0.3rem 0.8rem;
    border: 1.5px solid var(--accent-copper); color: var(--accent-copper);
}
.cat-tag.mca { border-color: #4A90A4; color: #4A90A4; }
.cat-tag.ici { border-color: #7B8FA0; color: #7B8FA0; }
.cat-tag.dme { border-color: var(--accent-copper); color: var(--accent-copper); }
.cat-tag.cc  { border-color: #8B9E7D; color: #8B9E7D; }
.article-meta .author {
    font-size: 0.85rem; color: var(--accent-copper); font-weight: 500;
}
.article-meta .date {
    font-size: 0.8rem; color: var(--text-gray); opacity: 0.7;
}

/* Featured Article Aside */
.featured-article-aside {
    background: var(--primary-dark);
    padding: 2.5rem;
    display: flex; flex-direction: column; justify-content: space-between;
}
.featured-article-aside .sponsor-note {
    font-size: 0.75rem; color: rgba(255,255,255,0.5);
    letter-spacing: 1px; text-transform: uppercase; margin-bottom: 1rem;
}
.featured-article-aside img {
    height: 44px; width: auto; border-radius: 4px; margin-bottom: 0.75rem;
}
.featured-article-aside p {
    font-size: 0.8rem; color: rgba(255,255,255,0.55); line-height: 1.6;
    font-style: italic;
}
.read-link {
    display: inline-flex; align-items: center; gap: 0.5rem;
    color: var(--accent-copper); font-weight: 700; font-size: 0.8rem;
    letter-spacing: 2px; text-transform: uppercase;
    margin-top: 1.5rem; transition: gap 0.2s ease;
}
.read-link:hover { gap: 0.8rem; }
.read-link svg { width: 14px; height: 14px; stroke: var(--accent-copper); stroke-width: 2.5; }

/* Recent Grid */
.recent-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

/* Article Card */
.article-card {
    background: var(--white);
    border-top: 3px solid transparent;
    padding: 1.75rem;
    transition: all 0.3s ease;
    text-decoration: none; color: inherit;
    display: block; position: relative; overflow: hidden;
}
.article-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
    background: linear-gradient(90deg, var(--accent-copper), var(--accent-light));
    transform: scaleX(0); transform-origin: left;
    transition: transform 0.3s ease;
}
.article-card:hover::before { transform: scaleX(1); }
.article-card:hover {
    box-shadow: 0 6px 20px rgba(26,35,50,0.1);
    transform: translateY(-3px);
}
.article-card h3 {
    font-family: 'DM Serif Display', serif;
    font-size: 1.25rem; color: var(--primary-dark); margin: 0.75rem 0;
    line-height: 1.3;
}
.article-card p {
    font-size: 0.95rem; line-height: 1.7; color: var(--text-gray); margin-bottom: 1.25rem;
}
.card-sponsor {
    display: flex; align-items: center; gap: 0.6rem;
    padding-top: 1rem; margin-top: auto;
    border-top: 1px solid rgba(26,35,50,0.06);
}
.card-sponsor img {
    height: 24px; width: auto; border-radius: 3px; opacity: 0.85;
}
.card-sponsor span {
    font-size: 0.68rem; letter-spacing: 1.5px; text-transform: uppercase;
    color: var(--text-gray); opacity: 0.55; font-weight: 500;
}

/* Category Sections */
.category-section { padding: 5rem 0; transition: opacity 0.3s ease; }
.category-section.hidden { display: none; }
.category-section:nth-child(odd) { background: var(--light-bg); }
.category-section:nth-child(even) { background: var(--off-white); }
.content-section { padding: 5rem 0; background: var(--off-white); }

.cat-header {
    display: grid; grid-template-columns: auto 1fr; gap: 2rem;
    align-items: start; margin-bottom: 3rem;
}
.cat-label-vertical {
    writing-mode: vertical-rl;
    font-size: 0.65rem; letter-spacing: 5px; text-transform: uppercase;
    font-weight: 700; padding-right: 1rem;
    border-right: 3px solid currentColor;
}
.cat-label-vertical.mca { color: #4A90A4; border-right-color: #4A90A4; }
.cat-label-vertical.ici { color: #7B8FA0; border-right-color: #7B8FA0; }
.cat-label-vertical.dme { color: var(--accent-copper); }
.cat-label-vertical.cc  { color: #8B9E7D; border-right-color: #8B9E7D; }

.cat-header-text h2 {
    font-family: 'DM Serif Display', serif;
    font-size: 2.2rem; color: var(--primary-dark); margin-bottom: 0.5rem;
}
.cat-header-text p {
    font-size: 1rem; color: var(--text-gray); max-width: 600px; line-height: 1.7;
}
.articles-list { display: flex; flex-direction: column; gap: 0; }
.article-row {
    display: grid; grid-template-columns: 90px 1fr auto;
    border-bottom: 1px solid rgba(26,35,50,0.08);
    padding: 2rem 0;
    text-decoration: none; color: inherit;
    transition: background 0.25s ease; align-items: start;
}
.article-row:hover { background: rgba(212,145,106,0.04); }
.article-row:first-child { border-top: 2px solid var(--primary-dark); }
.row-num {
    font-family: 'DM Serif Display', serif;
    font-size: 2.2rem; color: var(--accent-copper); opacity: 0.18; line-height: 1;
}
.row-body h3 {
    font-family: 'DM Serif Display', serif;
    font-size: 1.35rem; color: var(--primary-dark); margin-bottom: 0.5rem; line-height: 1.3;
}
.row-body p {
    font-size: 0.95rem; line-height: 1.6; color: var(--text-gray); max-width: 600px;
    margin-bottom: 0.75rem;
}
.row-meta { display: flex; gap: 0.75rem; align-items: center; flex-wrap: wrap; }
.row-date {
    font-size: 0.8rem; color: var(--text-gray); opacity: 0.65;
    white-space: nowrap; padding-top: 0.25rem;
}
.row-arrow {
    width: 20px; height: 20px; stroke: var(--accent-copper); stroke-width: 2;
    opacity: 0; transition: opacity 0.2s ease, transform 0.2s ease;
    margin-top: 0.5rem;
}
.article-row:hover .row-arrow { opacity: 1; transform: translateX(4px); }

/* Coming Soon placeholder */
.coming-soon {
    border: 2px dashed rgba(212,145,106,0.3);
    padding: 3rem 2rem; text-align: center; color: var(--text-gray);
}
.coming-soon p { font-size: 0.9rem; opacity: 0.6; letter-spacing: 1px; }


/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 768px) {
    /* Hero */
    .hero-content h1 { font-size: 2.5rem; }
    .hero h1 { font-size: 2.4rem; }
    .hero-stat-bar { gap: 1.5rem; }
    .hero-stat .num { font-size: 2rem; }

    /* Index */
    .mission-grid { grid-template-columns: 1fr; }
    .mission-tag {
        writing-mode: horizontal-tb; border-right: none;
        border-bottom: 3px solid var(--accent-copper);
        padding: 0 0 0.5rem 0; margin-bottom: 1rem;
    }
    .mission-text h2 { font-size: 2.2rem; }
    .wwd-item { grid-template-columns: 60px 1fr; }

    /* About */
    .diff-content h2 { font-size: 2.2rem; }
    .involve-grid { grid-template-columns: 1fr; gap: 2.5rem; }
    .involve-text h2 { font-size: 2.2rem; }
    .case-geo { display: none; }
    .case-inner { padding: 2.5rem 2rem; }
    .section-title-bar h2 { font-size: 2rem; }

    /* Cases */
    .intro-grid { grid-template-columns: 1fr; }
    .intro-tag {
        writing-mode: horizontal-tb; border-right: none;
        border-bottom: 3px solid var(--accent-copper);
        padding: 0 0 0.5rem 0; margin-bottom: 1rem;
    }
    .intro-text h2 { font-size: 2rem; }
    .case-card { grid-template-columns: 60px 1fr; }
    .cases-title-bar h2 { font-size: 2rem; }
    .cta-box { padding: 3rem 2rem; }

    /* Learning */
    .page-header-content h1 { font-size: 2.5rem; }
    .section-card { padding: 2rem 1.8rem; }
    .section-num { font-size: 3rem; }
    .section-header-text h2 { font-size: 1.6rem; }
    .section-links { flex-direction: column; }
    .section-link { justify-content: center; }

    /* Journal */
    .header-content { grid-template-columns: 1fr; gap: 1.5rem; }
    .header-text h1 { font-size: 2.5rem; }
    .featured-article { grid-template-columns: 1fr; }
    .featured-article-aside { display: none; }
    .article-row { grid-template-columns: 60px 1fr auto; }
    .cat-header { grid-template-columns: 1fr; }
    .cat-label-vertical {
        writing-mode: horizontal-tb; border-right: none;
        border-bottom: 3px solid currentColor;
        padding: 0 0 0.5rem 0; margin-bottom: 0.5rem;
    }
}

@media (max-width: 480px) {
    .nav-page-title { font-size: 0.65rem; letter-spacing: 4px; }
    .logo { height: 38px; }

    /* About Hero */
    .hero { padding: 3.5rem 1.5rem 4.5rem; }
    .hero-content h1 { font-size: 2rem; }
    .involve-cta { flex-direction: column; }
    .involve-cta .btn { text-align: center; }

    /* Cases */
    .case-tags { gap: 0.4rem; }

    /* Learning */
    .page-header { padding: 3rem 1.5rem 4rem; }
    .page-header-content h1 { font-size: 2rem; }
    .section-header { gap: 1rem; }
    .section-num { font-size: 2.5rem; }

    /* Journal */
    .header-text h1 { font-size: 2rem; }
    .filter-tab { padding: 0.9rem 1rem; font-size: 0.65rem; letter-spacing: 1.5px; }
}