/* ============================================================
   STMLab - main.css
   Design tokens, reset, base typography, layout, nav, footer
   ============================================================ */

/* ── Google Fonts import ──────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700&family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600&family=JetBrains+Mono:wght@400;500&display=swap');

/* -- Design Tokens (dark mode - default) ─────────────────── */
:root {
  /* Background layers */
  --bg-base:          #050510;
  --bg-surface:       #0a0a20;
  --bg-elevated:      #10102a;
  --bg-card:          rgba(255, 255, 255, 0.04);
  --bg-card-hover:    rgba(255, 255, 255, 0.07);
  --bg-overlay:       rgba(5, 5, 16, 0.85);

  /* Navbar */
  --navbar-scrolled:  rgba(5, 5, 16, 0.85);
  --navbar-mobile-bg: #0a0a20;
  --hero-grid-line:   rgba(255, 255, 255, 0.03);

  /* Gradient palette - rose to orange */
  --grad-a:   #e11d48;   /* rose    */
  --grad-b:   #f43f5e;   /* pink    */
  --grad-c:   #fb923c;   /* orange  */
  --gradient: linear-gradient(135deg, var(--grad-a), var(--grad-b), var(--grad-c));
  --gradient-text: linear-gradient(90deg, var(--grad-a), var(--grad-b) 50%, var(--grad-c));

  /* Semantic accents */
  --accent:        #e11d48;
  --accent-glow:   rgba(225, 29, 72, 0.25);
  --accent-light:  #f43f5e;

  /* Status colours */
  --color-active:    #22c55e;
  --color-completed: #64748b;
  --color-award:     #f59e0b;
  --color-grant:     #06b6d4;
  --color-event:     #8b5cf6;
  --color-hiring:    #ec4899;

  /* Text */
  --text-primary:   #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted:     #64748b;
  --text-inverse:   #050510;

  /* Borders */
  --border:       rgba(255, 255, 255, 0.10);
  --border-hover: rgba(225, 29, 72, 0.50);

  /* Typography */
  --font-heading: 'Plus Jakarta Sans', system-ui, sans-serif;
  --font-body:    'DM Sans', system-ui, sans-serif;
  --font-mono:    'JetBrains Mono', 'Fira Code', monospace;

  /* Type scale */
  --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;
  --text-7xl:  4.5rem;

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

  /* Border radius */
  --radius-sm:   6px;
  --radius-md:   12px;
  --radius-lg:   20px;
  --radius-xl:   28px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm:   0 1px 4px  rgba(0,0,0,0.18);
  --shadow-md:   0 2px 12px rgba(0,0,0,0.22);
  --shadow-lg:   0 4px 24px rgba(0,0,0,0.28);
  --shadow-glow: 0 0 20px   var(--accent-glow);
  --shadow-card: 0 1px 2px rgba(0,0,0,0.12), 0 2px 8px rgba(0,0,0,0.09);

  /* Transitions */
  --ease:       cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out:   cubic-bezier(0, 0, 0.2, 1);
  --t-fast:     150ms var(--ease);
  --t-normal:   250ms var(--ease);
  --t-slow:     400ms var(--ease);

  /* Layout */
  --nav-h:       68px;
  --max-w:       1200px;
  --max-w-prose: 720px;
}

/* ── Light mode overrides ─────────────────────────────────── */
[data-theme="light"] {
  --bg-base:          #f4f6fb;
  --bg-surface:       #eef0f8;
  --bg-elevated:      #e4e7f2;
  --bg-card:          rgba(0, 0, 0, 0.035);
  --bg-card-hover:    rgba(0, 0, 0, 0.065);
  --bg-overlay:       rgba(244, 246, 251, 0.92);

  --navbar-scrolled:  rgba(244, 246, 251, 0.92);
  --navbar-mobile-bg: #f4f6fb;
  --hero-grid-line:   rgba(0, 0, 0, 0.06);

  --accent:        #c01337;
  --accent-glow:   rgba(192, 19, 55, 0.18);
  --accent-light:  #e11d48;

  --text-primary:   #0f172a;
  --text-secondary: #334155;
  --text-muted:     #64748b;
  --text-inverse:   #f4f6fb;

  --border:       rgba(0, 0, 0, 0.09);
  --border-hover: rgba(192, 19, 55, 0.40);

  --shadow-sm:   0 1px 3px  rgba(0,0,0,0.05);
  --shadow-md:   0 2px 10px rgba(0,0,0,0.07);
  --shadow-lg:   0 4px 20px rgba(0,0,0,0.09);
  --shadow-glow: 0 0 16px   var(--accent-glow);
  --shadow-card: 0 1px 2px rgba(0,0,0,0.05), 0 2px 6px rgba(0,0,0,0.03);
}

/* ── Theme toggle ─────────────────────────────────────────── */
.theme-toggle {
  width: 48px;
  height: 26px;
  border-radius: var(--radius-full);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  cursor: pointer;
  position: relative;
  flex-shrink: 0;
  transition: background var(--t-normal), border-color var(--t-normal);
  padding: 0;
}

.theme-toggle-knob {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--text-muted);
  transition: transform var(--t-normal), background var(--t-normal);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  line-height: 1;
  pointer-events: none;
}

[data-theme="light"] .theme-toggle {
  background: rgba(225, 29, 72, 0.10);
  border-color: rgba(225, 29, 72, 0.28);
}

[data-theme="light"] .theme-toggle-knob {
  transform: translateX(22px);
  background: var(--accent);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--text-primary);
  background-color: var(--bg-base);
  min-height: 100vh;
  overflow-x: hidden;
  transition: background-color var(--t-normal), color var(--t-normal);
}

img, video { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button, input, select, textarea { font: inherit; }

/* ── Scrollbar ────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-base); }
::-webkit-scrollbar-thumb { background: var(--bg-elevated); border-radius: var(--radius-full); transition: background var(--t-normal); }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

/* ── Selection ────────────────────────────────────────────── */
::selection { background: rgba(225,29,72,0.28); color: var(--text-primary); }

/* ── Typography ───────────────────────────────────────────── */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.25;
  color: var(--text-primary);
}

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

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

code, pre {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
}

/* ── Layout Utilities ─────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

.section {
  padding-block: var(--space-20);
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-12);
}

.section-header h2 {
  font-size: var(--text-4xl);
  margin-bottom: var(--space-4);
}

.section-header p {
  font-size: var(--text-lg);
  max-width: var(--max-w-prose);
  margin-inline: auto;
}

.section-label {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-light);
  margin-bottom: var(--space-3);
}

/* ── Navigation ───────────────────────────────────────────── */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  transition: background var(--t-normal), box-shadow var(--t-normal),
              backdrop-filter var(--t-normal);
}

.navbar.scrolled {
  background: var(--navbar-scrolled);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 var(--border);
}

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

/* Logo */
.nav-logo {
  display: flex;
  flex-direction: column;
  gap: 1px;
  text-decoration: none;
}

.nav-logo-primary {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-logo-sub {
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  line-height: 1;
}

/* Nav links */
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  transition: color var(--t-fast), background var(--t-fast);
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
  background: var(--bg-card);
}

.nav-link.active {
  color: var(--accent-light);
}

/* Nav right-side actions (theme toggle + hamburger) */
.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

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

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

.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile menu */
.nav-mobile {
  display: none;
  position: fixed;
  top: var(--nav-h);
  left: 0;
  right: 0;
  z-index: 999;
  background: var(--navbar-mobile-bg);
  padding: var(--space-6);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-md);
  flex-direction: column;
  gap: var(--space-1);
}

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

.nav-mobile .nav-link {
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-base);
}

/* ── Hero (home page) ─────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: calc(var(--nav-h) + var(--space-12)) var(--space-6) var(--space-16);
  overflow: hidden;
}

/* Animated gradient orbs */
.hero::before,
.hero::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.18;
  animation: float 8s ease-in-out infinite;
  pointer-events: none;
}

.hero::before {
  width: 600px; height: 600px;
  background: var(--grad-a);
  top: -100px; left: 20%;
}

.hero::after {
  width: 500px; height: 500px;
  background: var(--grad-c);
  bottom: -50px; right: 15%;
  animation-delay: -4s;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--hero-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--hero-grid-line) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 40%, black 30%, transparent 100%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 900px;
}

.hero-logo {
  font-family: var(--font-heading);
  font-size: clamp(var(--text-5xl), 12vw, var(--text-7xl));
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: var(--space-3);
}

/* .hero-logo-l kept for backwards compat but gradient is now on parent */
.hero-logo-l { display: inline; }

.hero-expansion {
  font-size: var(--text-sm);
  font-weight: 400;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: var(--space-6);
}

.hero-expansion .hl { color: var(--accent-light); }

.hero-tagline {
  font-size: clamp(var(--text-lg), 2.5vw, var(--text-2xl));
  font-weight: 400;
  color: var(--text-secondary);
  max-width: 680px;
  margin-inline: auto;
  margin-bottom: var(--space-10);
  line-height: 1.6;
}

.hero-cta {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
}

/* ── Page Hero (inner pages) ──────────────────────────────── */
.page-hero {
  padding: calc(var(--nav-h) + var(--space-16)) var(--space-6) var(--space-12);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-hero::before {
  content: '';
  position: absolute;
  width: 800px; height: 400px;
  background: radial-gradient(ellipse, rgba(225,29,72,0.10) 0%, transparent 70%);
  top: 0; left: 50%;
  transform: translateX(-50%);
  pointer-events: none;
}

.page-hero h1 {
  font-size: clamp(var(--text-4xl), 5vw, var(--text-6xl));
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-4);
}

.page-hero p {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  max-width: var(--max-w-prose);
  margin-inline: auto;
}

/* ── Stats Bar ────────────────────────────────────────────── */
.stats-bar {
  padding: var(--space-10) 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
  text-align: center;
}

.stat-item {}

.stat-number {
  font-family: var(--font-heading);
  font-size: var(--text-4xl);
  font-weight: 700;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: var(--space-2);
}

.stat-label {
  font-size: var(--text-sm);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ── Footer ───────────────────────────────────────────────── */
.footer {
  margin-top: auto;
  border-top: 1px solid var(--border);
  padding: var(--space-12) 0 var(--space-8);
  background: var(--bg-surface);  transition: background var(--t-normal);}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-10);
  margin-bottom: var(--space-10);
}

.footer-brand {}

.footer-logo {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: 700;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-3);
  display: inline-block;
}

.footer-tagline {
  font-size: var(--text-sm);
  color: var(--text-muted);
  max-width: 280px;
  line-height: 1.6;
}

.footer-col h4 {
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: var(--space-4);
}

.footer-col ul { display: flex; flex-direction: column; gap: var(--space-2); }

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

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

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-6);
  border-top: 1px solid var(--border);
  font-size: var(--text-sm);
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: var(--space-4);
}

.social-links { display: flex; gap: var(--space-3); align-items: center; }

.social-link {
  width: 36px; height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-muted);
  font-size: var(--text-base);
  transition: border-color var(--t-fast), color var(--t-fast), background var(--t-fast);
  text-decoration: none;
}

.social-link:hover {
  border-color: var(--accent);
  color: var(--accent-light);
  background: var(--bg-card);
}

/* ── Utility classes ──────────────────────────────────────── */
.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

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

.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: var(--space-12) 0;
}

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: var(--space-8); }
  .stats-grid  { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .nav-links   { display: none; }
  .nav-toggle  { display: flex; }

  .hero-cta    { flex-direction: column; align-items: center; }
  .footer-grid { grid-template-columns: 1fr; }

  .section     { padding-block: var(--space-16); }
  .page-hero   { padding-block: calc(var(--nav-h) + var(--space-12)) var(--space-8); }

  .section-header h2 { font-size: var(--text-3xl); }

  /* Theme toggle always visible, hamburger only on mobile */
  .theme-toggle { display: block; }
}

@media (max-width: 480px) {
  .container   { padding-inline: var(--space-4); }
  .stats-grid  { grid-template-columns: repeat(2, 1fr); gap: var(--space-4); }
}