/* ==========================================================================
   Schedule Ventures Inc. — Design System Stylesheet
   Implements sv-design-system-agnostic.md tokens: colors, typography,
   spacing, radius, shadows, breakpoints.
   ========================================================================== */

:root {
  /* ---------- Semantic colors (light) ---------- */
  --color-primary: #2563eb;
  --color-primary-dark: #1e40af;
  --color-primary-light: #60a5fa;
  --color-primary-50: #eff6ff;
  --color-primary-100: #dbeafe;
  --color-primary-700: #1d4ed8;
  --color-primary-900: #1e3a8a;

  --color-secondary: #9333ea;
  --color-secondary-dark: #6b21a8;
  --color-secondary-light: #c084fc;

  --color-success: #16a34a;
  --color-warning: #ea580c;
  --color-error: #dc2626;

  /* ---------- Text ---------- */
  --text-primary: #020617;
  --text-secondary: rgba(2, 6, 23, 0.60);
  --text-disabled: rgba(0, 0, 0, 0.38);
  --text-on-primary: #ffffff;

  /* ---------- Surfaces ---------- */
  --bg-page: #f6f8ff;
  --bg-surface: #ffffff;
  --bg-muted: #f1f5f9;
  --section-alt: #eef2ff;
  --divider: #cbd5e1;

  /* ---------- Slate primitives ---------- */
  --slate-50: #f8fafc;
  --slate-100: #f1f5f9;
  --slate-200: #e2e8f0;
  --slate-300: #cbd5e1;
  --slate-400: #94a3b8;
  --slate-600: #475569;
  --slate-700: #334155;
  --slate-800: #1e293b;
  --slate-900: #0f172a;

  /* ---------- Radius ---------- */
  --r-sm: 2px;
  --r-default: 4px;
  --r-md: 6px;
  --r-lg: 8px;
  --r-xl: 12px;
  --r-2xl: 16px;
  --r-3xl: 24px;
  --r-full: 9999px;

  /* ---------- Spacing (4px base) ---------- */
  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 20px;
  --sp-6: 24px;
  --sp-8: 32px;
  --sp-10: 40px;
  --sp-12: 48px;
  --sp-16: 64px;
  --sp-20: 80px;
  --sp-24: 96px;

  /* ---------- Shadows ---------- */
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06), 0 1px 1px rgba(15, 23, 42, 0.04);
  --shadow-base: 0 1px 2px rgba(15, 23, 42, 0.06), 0 2px 6px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 4px 8px rgba(15, 23, 42, 0.08), 0 2px 4px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 12px 24px rgba(15, 23, 42, 0.10), 0 4px 8px rgba(15, 23, 42, 0.06);
  --shadow-xl: 0 24px 48px rgba(15, 23, 42, 0.14), 0 8px 16px rgba(15, 23, 42, 0.08);
  --shadow-2xl: 0 48px 80px rgba(15, 23, 42, 0.18), 0 16px 32px rgba(15, 23, 42, 0.10);

  /* ---------- Typography ---------- */
  --font-body: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "Roboto Mono", ui-monospace, Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-primary: #60a5fa;
    --color-primary-dark: #93c5fd;
    --color-primary-light: #2563eb;
    --text-primary: #f8fafc;
    --text-secondary: rgba(248, 250, 252, 0.60);
    --bg-page: #0f172a;
    --bg-surface: #1e293b;
    --bg-muted: #1e293b;
    --section-alt: #141c33;
    --divider: rgba(255, 255, 255, 0.12);
  }
}

/* ==========================================================================
   Base
   ========================================================================== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.5;
  color: var(--text-primary);
  background: var(--bg-page);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; display: block; }
a { color: var(--color-primary); text-decoration: none; transition: color 120ms ease; }
a:hover { color: var(--color-primary-dark); text-decoration: underline; }

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  line-height: 1.2;
}

/* ==========================================================================
   Layout
   ========================================================================== */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding-inline: var(--sp-5);
}
@media (min-width: 750px) { .container { padding-inline: var(--sp-12); } }
@media (min-width: 1024px) { .container { padding-inline: var(--sp-8); } }

main section { padding-block: var(--sp-20); }
@media (min-width: 1024px) { main section { padding-block: var(--sp-24); } }

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

.section-label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin: 0 0 var(--sp-3);
  text-align: center;
}
.section-title {
  font-size: 24px;
  text-align: center;
  margin: 0 auto var(--sp-3);
  max-width: 760px;
}
@media (min-width: 750px) { .section-title { font-size: 34px; } }
.section-subtitle {
  text-align: center;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto var(--sp-12);
  font-size: 17px;
  line-height: 1.55;
}

/* ==========================================================================
   Header / Nav
   ========================================================================== */
header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(246, 248, 255, 0.85);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--divider);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: var(--sp-6);
}
.header-left {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}
.venture-logo {
  height: 36px;
  width: auto;
  border-radius: var(--r-md);
}
.site-logo {
  font-weight: 700;
  font-size: 18px;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}
.site-logo span {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: none;
  gap: var(--sp-6);
  align-items: center;
}
@media (min-width: 750px) { nav ul { display: flex; } }
nav a {
  color: var(--text-primary);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.04em;
  padding: var(--sp-2) 0;
  position: relative;
}
nav a:hover { color: var(--color-primary); text-decoration: none; }
nav a.active { color: var(--color-primary); }
nav a.active::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 2px;
  background: var(--color-primary);
  border-radius: var(--r-full);
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  min-width: 100px;
  min-height: 46px;
  padding: 0 var(--sp-6);
  border-radius: var(--r-xl);
  border: 1px solid transparent;
  background: var(--color-primary);
  color: var(--text-on-primary);
  font-family: inherit;
  font-weight: 600;
  font-size: 16px;
  line-height: 24px;
  text-decoration: none;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: transform 120ms ease, box-shadow 120ms ease, background 120ms ease, color 120ms ease, border-color 120ms ease;
}
.btn:hover {
  background: var(--color-primary-dark);
  box-shadow: var(--shadow-lg);
  transform: translateY(-1px);
  text-decoration: none;
  color: var(--text-on-primary);
}
.btn-outline {
  background: transparent;
  color: var(--text-on-primary);
  border-color: rgba(255, 255, 255, 0.45);
  box-shadow: none;
}
.btn-outline:hover {
  background: rgba(255, 255, 255, 0.10);
  border-color: #ffffff;
  color: #ffffff;
}
/* Outline button on light surfaces */
.section-alt .btn-outline,
main section:not(.hero):not(.about-hero):not(.signup-hero) .btn-outline {
  color: var(--color-primary);
  border-color: var(--divider);
  background: var(--bg-surface);
  box-shadow: var(--shadow-sm);
}
.section-alt .btn-outline:hover,
main section:not(.hero):not(.about-hero):not(.signup-hero) .btn-outline:hover {
  background: var(--color-primary-50);
  border-color: var(--color-primary);
}

/* ==========================================================================
   Hero (homepage)
   ========================================================================== */
.hero {
  padding-block: var(--sp-24) var(--sp-20);
  background:
    radial-gradient(600px 400px at 10% -10%, rgba(37, 99, 235, 0.12), transparent 60%),
    radial-gradient(500px 400px at 110% -20%, rgba(147, 51, 234, 0.12), transparent 60%),
    linear-gradient(180deg, var(--bg-page) 0%, var(--bg-surface) 100%);
  text-align: center;
  border-bottom: 1px solid var(--divider);
}
.hero .container { max-width: 880px; }
.hero-eyebrow {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-primary-700);
  background: var(--color-primary-50);
  padding: 6px var(--sp-4);
  border-radius: var(--r-full);
  margin-bottom: var(--sp-6);
}
.hero h1 {
  font-size: 28px;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: var(--sp-5);
}
@media (min-width: 750px) {
  .hero h1 { font-size: 60px; line-height: 1.05; }
}
.hero p {
  font-size: 18px;
  line-height: 1.55;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto var(--sp-8);
}
.hero-cta {
  display: flex;
  gap: var(--sp-3);
  justify-content: center;
  flex-wrap: wrap;
}
.hero .btn-outline {
  background: var(--bg-surface);
  color: var(--text-primary);
  border-color: var(--divider);
  box-shadow: var(--shadow-sm);
}
.hero .btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--bg-surface);
}

/* ==========================================================================
   Pillar / feature cards
   ========================================================================== */
.pillars {
  display: grid;
  gap: var(--sp-6);
  grid-template-columns: 1fr;
}
@media (min-width: 750px) { .pillars { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .pillars { grid-template-columns: repeat(4, 1fr); } }
.pillar-card {
  background: var(--bg-surface);
  padding: var(--sp-8);
  border-radius: var(--r-2xl);
  border: 1px solid var(--divider);
  box-shadow: var(--shadow-sm);
  transition: transform 200ms ease, box-shadow 200ms ease, border-color 200ms ease;
}
.pillar-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}
.pillar-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--r-xl);
  background: var(--color-primary-50);
  color: var(--color-primary);
  display: grid;
  place-items: center;
  margin-bottom: var(--sp-5);
}
.pillar-icon svg { width: 24px; height: 24px; fill: currentColor; }
.pillar-card h3 {
  font-size: 18px;
  margin-bottom: var(--sp-2);
}
.pillar-card p {
  color: var(--text-secondary);
  font-size: 15px;
  margin: 0;
  line-height: 1.55;
}

/* ==========================================================================
   Stat bar
   ========================================================================== */
.stat-bar {
  background: linear-gradient(135deg, var(--color-primary-900) 0%, var(--color-primary) 60%, var(--color-secondary) 100%);
  padding-block: var(--sp-16);
  color: #ffffff;
  position: relative;
  overflow: hidden;
}
.stat-bar::before, .stat-bar::after {
  content: "";
  position: absolute;
  border-radius: var(--r-full);
  background: rgba(255, 255, 255, 0.06);
  pointer-events: none;
}
.stat-bar::before { width: 320px; height: 320px; top: -120px; right: -100px; }
.stat-bar::after { width: 240px; height: 240px; bottom: -120px; left: -80px; }
.stat-grid {
  display: grid;
  gap: var(--sp-8);
  grid-template-columns: 1fr;
  position: relative;
}
@media (min-width: 750px) { .stat-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .stat-grid { grid-template-columns: repeat(4, 1fr); } }
.stat-item { text-align: center; }
.stat-item h3 {
  color: #ffffff;
  font-size: 40px;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin-bottom: var(--sp-2);
}
@media (min-width: 750px) { .stat-item h3 { font-size: 48px; } }
.stat-item p {
  color: rgba(255, 255, 255, 0.82);
  font-size: 14px;
  margin: 0;
}

/* ==========================================================================
   Platform block (2-col)
   ========================================================================== */
.platform-block {
  display: grid;
  gap: var(--sp-10);
  align-items: center;
  grid-template-columns: 1fr;
}
@media (min-width: 1024px) { .platform-block { grid-template-columns: 1.1fr 0.9fr; gap: var(--sp-16); } }
.platform-text h2 {
  font-size: 28px;
  margin-bottom: var(--sp-4);
}
@media (min-width: 750px) { .platform-text h2 { font-size: 40px; } }
.platform-text p {
  color: var(--text-secondary);
  font-size: 16px;
  line-height: 1.6;
  margin-bottom: var(--sp-4);
}
.platform-text ul {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--sp-8);
  display: grid;
  gap: var(--sp-3);
}
.platform-text ul li {
  position: relative;
  padding-left: var(--sp-8);
  font-size: 15px;
  color: var(--text-primary);
  line-height: 1.5;
}
.platform-text ul li::before {
  content: "";
  position: absolute;
  left: 0; top: 4px;
  width: 20px; height: 20px;
  border-radius: var(--r-full);
  background: var(--color-primary-50);
  background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%232563eb' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
  background-size: 12px 12px;
}
.platform-visual {
  background: var(--bg-surface);
  border-radius: var(--r-3xl);
  padding: var(--sp-10) var(--sp-8);
  border: 1px solid var(--divider);
  box-shadow: var(--shadow-xl);
  text-align: center;
}
.platform-visual img {
  max-width: 280px;
  margin: 0 auto var(--sp-5);
  border-radius: var(--r-lg);
}
.platform-visual p {
  color: var(--text-secondary);
  font-size: 14px;
  margin: 0;
}

/* ==========================================================================
   CTA band
   ========================================================================== */
.cta-band {
  background: linear-gradient(135deg, var(--slate-900) 0%, var(--color-primary-900) 100%);
  color: #ffffff;
  padding-block: var(--sp-16);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-band::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(400px 240px at 20% 20%, rgba(37, 99, 235, 0.30), transparent 60%),
    radial-gradient(400px 240px at 80% 80%, rgba(147, 51, 234, 0.30), transparent 60%);
  pointer-events: none;
}
.cta-band .container { position: relative; }
.cta-band h2 {
  color: #ffffff;
  font-size: 28px;
  margin-bottom: var(--sp-3);
}
@media (min-width: 750px) { .cta-band h2 { font-size: 36px; } }
.cta-band p {
  color: rgba(255, 255, 255, 0.85);
  max-width: 600px;
  margin: 0 auto var(--sp-8);
  font-size: 16px;
  line-height: 1.55;
}

/* ==========================================================================
   About page
   ========================================================================== */
.about-hero, .signup-hero {
  padding-block: var(--sp-24) var(--sp-16);
  background:
    radial-gradient(600px 400px at 10% -10%, rgba(37, 99, 235, 0.12), transparent 60%),
    radial-gradient(500px 400px at 110% -20%, rgba(147, 51, 234, 0.12), transparent 60%),
    linear-gradient(180deg, var(--bg-page) 0%, var(--bg-surface) 100%);
  text-align: center;
  border-bottom: 1px solid var(--divider);
}
.about-hero h1, .signup-hero h1 {
  font-size: 28px;
  letter-spacing: -0.03em;
  margin-bottom: var(--sp-4);
}
@media (min-width: 750px) {
  .about-hero h1, .signup-hero h1 { font-size: 48px; line-height: 1.1; }
}
.about-hero p, .signup-hero p {
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto;
  font-size: 17px;
  line-height: 1.55;
}

.mission-block {
  display: grid;
  gap: var(--sp-12);
  grid-template-columns: 1fr;
}
@media (min-width: 1024px) { .mission-block { grid-template-columns: 1.1fr 0.9fr; gap: var(--sp-16); } }
.mission-block h2 {
  font-size: 28px;
  margin-bottom: var(--sp-4);
}
@media (min-width: 750px) { .mission-block h2 { font-size: 34px; } }
.mission-block p {
  color: var(--text-secondary);
  font-size: 16px;
  line-height: 1.6;
  margin-bottom: var(--sp-4);
}

.values-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: var(--sp-3);
}
.values-list li {
  position: relative;
  padding: var(--sp-4) var(--sp-4) var(--sp-4) var(--sp-12);
  background: var(--bg-surface);
  border: 1px solid var(--divider);
  border-radius: var(--r-xl);
  box-shadow: var(--shadow-sm);
  font-size: 14px;
  color: var(--text-primary);
  line-height: 1.5;
}
.values-list li::before {
  content: "";
  position: absolute;
  left: var(--sp-4);
  top: 50%;
  transform: translateY(-50%);
  width: 24px; height: 24px;
  border-radius: var(--r-full);
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
  background-size: 14px 14px;
}

/* Team grid */
.team-grid {
  display: grid;
  gap: var(--sp-6);
  grid-template-columns: 1fr;
}
@media (min-width: 750px) { .team-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .team-grid { grid-template-columns: repeat(3, 1fr); } }
.team-card {
  background: var(--bg-surface);
  border: 1px solid var(--divider);
  border-radius: var(--r-2xl);
  padding: var(--sp-6);
  box-shadow: var(--shadow-sm);
  text-align: center;
  transition: transform 200ms ease, box-shadow 200ms ease;
}
.team-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.team-photo {
  width: 120px;
  height: 120px;
  border-radius: var(--r-full);
  margin: 0 auto var(--sp-4);
  object-fit: cover;
  border: 3px solid var(--bg-surface);
  box-shadow: 0 0 0 3px var(--color-primary-100), var(--shadow-md);
  background: var(--bg-muted);
}
.team-card h3 {
  font-size: 18px;
  margin-bottom: var(--sp-1);
}
.team-role {
  color: var(--color-primary);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  margin: 0 0 var(--sp-3);
}
.team-card p {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.55;
  margin: 0;
}

/* ==========================================================================
   Signup page
   ========================================================================== */
.signup-form-wrap {
  max-width: 620px;
  margin: 0 auto;
  background: var(--bg-surface);
  padding: var(--sp-10);
  border-radius: var(--r-3xl);
  border: 1px solid var(--divider);
  box-shadow: var(--shadow-xl);
}
@media (max-width: 749px) {
  .signup-form-wrap { padding: var(--sp-6); border-radius: var(--r-2xl); }
}
.signup-form-wrap h2 {
  font-size: 24px;
}
.signup-form-wrap > p {
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.55;
}

.form-group {
  margin-bottom: var(--sp-5);
}
.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--text-primary);
  margin-bottom: var(--sp-2);
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  min-height: 46px;
  padding: var(--sp-3) var(--sp-4);
  border-radius: var(--r-xl);
  border: 1px solid var(--divider);
  background: var(--bg-surface);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 15px;
  line-height: 1.4;
  box-shadow: var(--shadow-sm);
  transition: border-color 120ms ease, box-shadow 120ms ease;
  -webkit-appearance: none;
  appearance: none;
}
.form-group select {
  background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23475569' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--sp-4) center;
  background-size: 16px;
  padding-right: var(--sp-10);
}
.form-group textarea {
  min-height: 120px;
  resize: vertical;
  padding-top: var(--sp-3);
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px var(--color-primary-100);
}
.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-secondary);
}
.form-submit-wrap {
  text-align: center;
  margin-top: var(--sp-8);
}
.form-submit-wrap .btn { min-width: 220px; }
.form-note {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.55;
  text-align: center;
}

/* ==========================================================================
   Footer
   ========================================================================== */
footer {
  background: var(--slate-900);
  color: rgba(248, 250, 252, 0.70);
  padding-block: var(--sp-10);
  text-align: center;
}
footer p {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
}
footer a {
  color: rgba(248, 250, 252, 0.90);
}
footer a:hover { color: #ffffff; }

/* ==========================================================================
   Accessibility helpers
   ========================================================================== */
:focus-visible {
  outline: 3px solid var(--color-primary-light);
  outline-offset: 2px;
  border-radius: var(--r-default);
}
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
}