/* ============================================================
   SAFE SCROLL — STYLESHEET
   Modern dark theme for a youth digital wellness initiative
   ============================================================ */

/* ============================================================
   CSS CUSTOM PROPERTIES
   ============================================================ */
:root {
  /* Color palette */
  --color-bg:          #080d1a;
  --color-bg-alt:      #0d1426;
  --color-bg-card:     rgba(255, 255, 255, 0.04);
  --color-bg-card-hover: rgba(255, 255, 255, 0.07);
  --color-border:      rgba(255, 255, 255, 0.08);
  --color-border-hover: rgba(79, 163, 224, 0.35);

  --color-text:        #e8edf5;
  --color-text-muted:  #8a9bbf;
  --color-text-subtle: #5a6a8a;

  --color-accent-1:    #4fa3e0;   /* cool blue */
  --color-accent-2:    #38d9c0;   /* teal */
  --color-accent-mid:  #44bee0;   /* midpoint */

  --gradient-accent:   linear-gradient(135deg, var(--color-accent-1), var(--color-accent-2));
  --gradient-bg-glow:  radial-gradient(ellipse 80% 50% at 50% 0%, rgba(79, 163, 224, 0.12) 0%, transparent 70%);
  --gradient-hero:     radial-gradient(ellipse 60% 80% at 70% 40%, rgba(56, 217, 192, 0.06) 0%, transparent 60%),
                       radial-gradient(ellipse 50% 60% at 20% 60%, rgba(79, 163, 224, 0.08) 0%, transparent 55%);

  /* Badge colors */
  --color-badge-root:  rgba(79, 163, 224, 0.18);
  --color-badge-harm:  rgba(240, 140, 80, 0.18);
  --color-badge-risk:  rgba(190, 80, 240, 0.18);

  /* Spacing scale */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-7:  1.75rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Border radius */
  --radius-sm:   0.5rem;
  --radius-md:   0.875rem;
  --radius-lg:   1.25rem;
  --radius-xl:   1.75rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-card:  0 1px 3px rgba(0, 0, 0, 0.4),
                  0 4px 16px rgba(0, 0, 0, 0.3),
                  inset 0 1px 0 rgba(255, 255, 255, 0.06);
  --shadow-card-hover: 0 2px 8px rgba(0, 0, 0, 0.5),
                       0 8px 32px rgba(0, 0, 0, 0.4),
                       inset 0 1px 0 rgba(255, 255, 255, 0.08);

  /* Typography */
  --font-base:    'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --text-xs:      0.75rem;
  --text-sm:      0.875rem;
  --text-base:    1rem;
  --text-lg:      1.125rem;
  --text-xl:      1.25rem;
  --text-2xl:     1.5rem;
  --text-3xl:     1.875rem;
  --text-4xl:     2.25rem;
  --text-5xl:     3rem;
  --text-6xl:     3.75rem;

  /* Layout */
  --max-width:    1200px;
  --nav-height:   68px;

  /* Transitions */
  --transition-fast:   150ms ease;
  --transition-base:   250ms ease;
  --transition-slow:   400ms ease;
}

/* ============================================================
   RESET & BASE
   ============================================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + 16px);
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-base);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.65;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Focus styles for accessibility */
:focus-visible {
  outline: 2px solid var(--color-accent-1);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* Skip to main content link (visually hidden until focused) */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  z-index: 200;
  padding: var(--space-3) var(--space-6);
  background: var(--gradient-accent);
  color: #fff;
  font-weight: 600;
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--space-4);
}

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

img, svg {
  display: block;
  max-width: 100%;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  font-weight: 700;
}

p {
  color: var(--color-text-muted);
}

strong {
  color: var(--color-text);
  font-weight: 600;
}

/* ============================================================
   LAYOUT
   ============================================================ */
.container {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

.section {
  padding-block: var(--space-24);
  position: relative;
}

.section-alt {
  background-color: var(--color-bg-alt);
}

/* ============================================================
   TYPOGRAPHY COMPONENTS
   ============================================================ */
.section-eyebrow {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-4);
}

.section-header {
  max-width: 680px;
  margin-bottom: var(--space-12);
}

.section-title {
  font-size: clamp(var(--text-3xl), 4vw, var(--text-4xl));
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: var(--space-5);
}

.section-lead {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  line-height: 1.75;
}

/* ============================================================
   NAVIGATION
   ============================================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  background: rgba(8, 13, 26, 0.75);
  backdrop-filter: blur(16px) saturate(1.4);
  -webkit-backdrop-filter: blur(16px) saturate(1.4);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition-base), border-color var(--transition-base);
}

.site-header.scrolled {
  background: rgba(8, 13, 26, 0.92);
  border-bottom-color: rgba(255, 255, 255, 0.1);
}

.nav-inner {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-6);
  width: 100%;
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
  transition: opacity var(--transition-fast);
}

.nav-logo:hover {
  opacity: 0.85;
}

.logo-icon {
  display: flex;
  align-items: center;
}

.logo-text {
  font-size: var(--text-xl);
  font-weight: 800;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.logo-accent {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-left: auto;
}

.nav-link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  transition: color var(--transition-fast), background var(--transition-fast);
  white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-text);
  background: rgba(255, 255, 255, 0.07);
}

.nav-link.nav-cta {
  background: var(--gradient-accent);
  color: #fff;
  font-weight: 600;
  padding: var(--space-2) var(--space-5);
}

.nav-link.nav-cta:hover {
  opacity: 0.9;
  background: var(--gradient-accent);
  color: #fff;
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  margin-left: auto;
  border-radius: var(--radius-sm);
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: var(--radius-full);
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  font-size: var(--text-base);
  font-weight: 600;
  font-family: var(--font-base);
  cursor: pointer;
  border: none;
  transition: transform var(--transition-fast), opacity var(--transition-fast), box-shadow var(--transition-fast);
  text-align: center;
  line-height: 1;
  white-space: nowrap;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background: var(--gradient-accent);
  color: #fff;
  box-shadow: 0 4px 20px rgba(79, 163, 224, 0.3);
}

.btn-primary:hover {
  box-shadow: 0 6px 28px rgba(79, 163, 224, 0.45);
  opacity: 0.95;
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.06);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.18);
}

.btn-secondary {
  background: transparent;
  color: var(--color-accent-1);
  border: 1.5px solid var(--color-accent-1);
}

.btn-secondary:hover {
  background: rgba(79, 163, 224, 0.1);
}

/* ============================================================
   GLASS CARDS
   ============================================================ */
.glass-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: transform var(--transition-base),
              box-shadow var(--transition-base),
              border-color var(--transition-base),
              background var(--transition-base);
}

.glass-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-border-hover);
  background: var(--color-bg-card-hover);
}

/* ============================================================
   CARD GRID
   ============================================================ */
.card-grid {
  display: grid;
  gap: var(--space-6);
}

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

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

/* ============================================================
   SCROLL REVEAL ANIMATION
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

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

.reveal-delay-1 { transition-delay: 0.15s; }
.reveal-delay-2 { transition-delay: 0.3s; }
.reveal-delay-3 { transition-delay: 0.45s; }

/* ============================================================
   HERO SECTION
   ============================================================ */
.section-hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: calc(var(--nav-height) + var(--space-16));
  padding-bottom: var(--space-24);
  background: var(--color-bg);
  overflow: hidden;
}

.hero-bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    var(--gradient-hero),
    linear-gradient(rgba(79, 163, 224, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(79, 163, 224, 0.04) 1px, transparent 1px);
  background-size: auto, 60px 60px, 60px 60px;
  pointer-events: none;
}

.hero-layout {
  display: grid;
  grid-template-columns: 1fr 420px;
  gap: var(--space-12);
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-eyebrow {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-5);
}

.hero-headline {
  font-size: clamp(var(--text-4xl), 5.5vw, var(--text-6xl));
  font-weight: 800;
  color: var(--color-text);
  letter-spacing: -0.03em;
  line-height: 1.08;
  margin-bottom: var(--space-6);
}

.hero-headline em {
  font-style: normal;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-sub {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  line-height: 1.75;
  max-width: 560px;
  margin-bottom: var(--space-8);
}

.hero-actions {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

/* Hero card */
.hero-card {
  padding: var(--space-8);
}

.hero-card-icon {
  margin-bottom: var(--space-5);
}

.hero-card-title {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

.hero-card-body {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.75;
  margin-bottom: var(--space-5);
}

.hero-card-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}

.hero-card-list li {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.5;
}

.list-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--gradient-accent);
  flex-shrink: 0;
}

.card-link-arrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-accent-1);
  transition: gap var(--transition-fast), color var(--transition-fast);
}

.card-link-arrow:hover {
  gap: var(--space-3);
  color: var(--color-accent-2);
}

/* ============================================================
   CONCERN CARDS (Why It Matters)
   ============================================================ */
.concern-card h3 {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.concern-card p {
  font-size: var(--text-base);
  line-height: 1.7;
}

.concern-icon {
  margin-bottom: var(--space-4);
}

/* ============================================================
   PROBLEM LANDSCAPE
   ============================================================ */
.problem-tree {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  gap: 0;
  align-items: start;
}

.problem-col-header {
  margin-bottom: var(--space-5);
  text-align: center;
}

.problem-col-badge {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
}

.badge-root {
  background: var(--color-badge-root);
  color: var(--color-accent-1);
  border: 1px solid rgba(79, 163, 224, 0.25);
}

.badge-harm {
  background: var(--color-badge-harm);
  color: #f09050;
  border: 1px solid rgba(240, 144, 80, 0.25);
}

.badge-risk {
  background: var(--color-badge-risk);
  color: #c060f0;
  border: 1px solid rgba(192, 96, 240, 0.25);
}

.problem-cards {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.problem-card {
  padding: var(--space-5);
}

.problem-card h3 {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.problem-card p {
  font-size: var(--text-sm);
  line-height: 1.65;
  color: var(--color-text-muted);
}

.problem-arrow-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding-top: 52px; /* align with card area */
  padding-inline: var(--space-4);
  gap: var(--space-2);
  height: 100%;
}

.problem-arrow-line {
  width: 1px;
  flex: 1;
  background: linear-gradient(to bottom, transparent, var(--color-accent-1), transparent);
  opacity: 0.3;
}

.problem-arrow-svg {
  flex-shrink: 0;
  opacity: 0.7;
}

/* ============================================================
   POLICY GAPS SECTION
   ============================================================ */
.policy-layout {
  display: grid;
  grid-template-columns: 1fr 1.6fr;
  gap: var(--space-8);
  align-items: start;
}

.policy-context {
  padding: var(--space-8);
}

.policy-context h3 {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}

.policy-context p {
  font-size: var(--text-base);
  line-height: 1.75;
  margin-bottom: var(--space-4);
}

.policy-tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-5);
}

.policy-tag {
  font-size: var(--text-xs);
  font-weight: 600;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  background: rgba(79, 163, 224, 0.1);
  color: var(--color-accent-1);
  border: 1px solid rgba(79, 163, 224, 0.2);
}

.gap-cards-title {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-5);
}

.gap-card {
  padding: var(--space-5);
}

.gap-card h4 {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-2);
  margin-top: var(--space-3);
}

.gap-card p {
  font-size: var(--text-sm);
  line-height: 1.65;
}

.gap-icon {
  opacity: 0.85;
}

/* ============================================================
   SOLUTIONS SECTION
   ============================================================ */
.solution-card {
  padding: var(--space-7);
  position: relative;
}

.solution-num {
  font-size: var(--text-xs);
  font-weight: 800;
  letter-spacing: 0.1em;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-4);
}

.solution-icon {
  margin-bottom: var(--space-4);
  opacity: 0.9;
}

.solution-card h3 {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.solution-card p {
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--color-text-muted);
}

/* ============================================================
   AUDIENCE SECTION
   ============================================================ */
.audience-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-5);
}

.audience-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-6);
}

.audience-icon {
  opacity: 0.9;
}

.audience-card h3 {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
}

.audience-card p {
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-text-muted);
  flex: 1;
}

.audience-tag {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  background: rgba(56, 217, 192, 0.1);
  color: var(--color-accent-2);
  border: 1px solid rgba(56, 217, 192, 0.2);
  align-self: flex-start;
  white-space: nowrap;
}

/* ============================================================
   CTA SECTION
   ============================================================ */
.section-cta {
  background: var(--color-bg);
  overflow: hidden;
}

.cta-bg-glow {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 70% 70% at 50% 50%, rgba(79, 163, 224, 0.1) 0%, transparent 70%);
  pointer-events: none;
}

.cta-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 860px;
  margin-inline: auto;
}

.cta-title {
  font-size: clamp(var(--text-3xl), 4.5vw, var(--text-5xl));
  font-weight: 800;
  color: var(--color-text);
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: var(--space-6);
}

.cta-lead {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  line-height: 1.75;
  max-width: 680px;
  margin-inline: auto;
  margin-bottom: var(--space-8);
}

.cta-actions {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: var(--space-12);
}

.cta-card-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
  text-align: left;
}

.cta-action-card {
  padding: var(--space-6);
}

.cta-action-icon {
  margin-bottom: var(--space-4);
  opacity: 0.9;
}

.cta-action-card h3 {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.cta-action-card p {
  font-size: var(--text-sm);
  line-height: 1.65;
  color: var(--color-text-muted);
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
}

.footer-inner {
  padding-block: var(--space-16);
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: var(--space-12);
  align-items: start;
}

.footer-logo {
  margin-bottom: var(--space-5);
}

.footer-mission {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.75;
  max-width: 420px;
  margin-bottom: var(--space-4);
}

.footer-contact {
  font-size: var(--text-sm);
  color: var(--color-accent-1);
  transition: color var(--transition-fast);
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-base);
  padding: 0;
  text-align: left;
}

.footer-contact:hover {
  color: var(--color-accent-2);
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

.footer-nav-col h4 {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-subtle);
  margin-bottom: var(--space-4);
}

.footer-nav-col ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-nav-col a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.footer-nav-col a:hover {
  color: var(--color-accent-1);
}

.footer-nav-link {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-base);
  padding: 0;
  text-align: left;
}

.footer-nav-link:hover {
  color: var(--color-accent-1);
}

/* ============================================================
   CONTACT MODAL
   ============================================================ */
.contact-modal {
  position: fixed;
  inset: 0;
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.contact-modal:not([hidden]) {
  opacity: 1;
}

.contact-modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.contact-modal-content {
  position: relative;
  z-index: 1;
  max-width: 500px;
  width: 100%;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  box-shadow: var(--shadow-card-hover);
  transform: scale(0.95);
  transition: transform var(--transition-base);
}

.contact-modal:not([hidden]) .contact-modal-content {
  transform: scale(1);
}

/* Reverse animation when closing — placed after :not([hidden]) rules so
   equal specificity is resolved in favour of these (last declaration wins). */
.contact-modal.contact-modal--closing {
  opacity: 0;
}

.contact-modal.contact-modal--closing .contact-modal-content {
  transform: scale(0.95);
}

.contact-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
}

.contact-modal-title {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  margin: 0;
}

.contact-modal-close {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-2);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}

.contact-modal-close:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-text);
  border-color: var(--color-border-hover);
}

.contact-modal-message {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
  margin: 0;
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
}

.footer-bottom-inner {
  padding-block: var(--space-8);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.footer-credits {
  text-align: center;
  max-width: 600px;
  margin-inline: auto;
}

.footer-credits-title {
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.footer-credits-author {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-1);
}

.footer-credits-institution,
.footer-credits-school,
.footer-credits-program,
.footer-credits-course,
.footer-credits-semester {
  font-size: var(--text-xs);
  color: var(--color-text-subtle);
  line-height: 1.6;
}

.footer-disclaimer {
  font-size: var(--text-xs);
  color: var(--color-text-subtle);
  line-height: 1.6;
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  font-style: italic;
  opacity: 0.85;
}

.footer-legal-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
  padding-top: var(--space-4);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-legal {
  font-size: var(--text-xs);
  color: var(--color-text-subtle);
}

.footer-tagline {
  font-size: var(--text-xs);
  color: var(--color-text-subtle);
}

/* ============================================================
   RESPONSIVE — TABLET (≤ 1024px)
   ============================================================ */
@media (max-width: 1024px) {
  .hero-layout {
    grid-template-columns: 1fr;
    max-width: 720px;
    margin-inline: auto;
  }

  .hero-card {
    max-width: 560px;
  }

  .card-grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }

  .problem-tree {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

  .problem-arrow-col {
    display: none;
  }

  .problem-column {
    padding: 0;
  }

  .policy-layout {
    grid-template-columns: 1fr;
  }

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

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

  .footer-inner {
    grid-template-columns: 1fr;
  }

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

/* ============================================================
   RESPONSIVE — MOBILE (≤ 768px)
   ============================================================ */
@media (max-width: 768px) {
  :root {
    --nav-height: 60px;
    --space-24: 4rem;
    --space-16: 3rem;
  }

  /* Mobile navigation */
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-1);
    background: rgba(8, 13, 26, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-4) var(--space-6);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-link {
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
    text-align: left;
  }

  .nav-link.nav-cta {
    text-align: center;
    margin-top: var(--space-2);
  }

  /* Typography adjustments */
  .section-title {
    font-size: var(--text-3xl);
  }

  /* Hero */
  .section-hero {
    padding-top: calc(var(--nav-height) + var(--space-8));
    min-height: auto;
  }

  .hero-headline {
    font-size: var(--text-4xl);
  }

  .hero-actions {
    flex-direction: column;
    align-items: flex-start;
  }

  .hero-actions .btn {
    width: 100%;
    justify-content: center;
  }

  /* Cards */
  .card-grid-2,
  .card-grid-3 {
    grid-template-columns: 1fr;
  }

  /* Audience */
  .audience-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* CTA */
  .cta-card-row {
    grid-template-columns: 1fr;
  }

  .cta-actions {
    flex-direction: column;
    align-items: center;
  }

  .cta-actions .btn {
    width: 100%;
    max-width: 300px;
    justify-content: center;
  }

  /* Footer */
  .footer-inner {
    padding-block: var(--space-12);
  }

  .footer-nav {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-6);
  }

  .footer-bottom-inner {
    flex-direction: column;
    text-align: center;
  }

  .footer-legal-row {
    flex-direction: column;
    text-align: center;
    justify-content: center;
  }
}

/* ============================================================
   RESPONSIVE — SMALL MOBILE (≤ 480px)
   ============================================================ */
@media (max-width: 480px) {
  .container {
    padding-inline: var(--space-4);
  }

  .hero-headline {
    font-size: var(--text-3xl);
  }

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

  .footer-nav {
    grid-template-columns: 1fr;
  }

  .card-grid {
    gap: var(--space-4);
  }
}

/* ============================================================
   REDUCED MOTION
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .btn,
  .glass-card,
  .nav-link,
  .card-link-arrow {
    transition: none;
  }
}