/**
 * BRAINSTEM-HOME.CSS
 *
 * Clean, professional design inspired by Directed Electronics proposal.
 * Light theme with Brain-Stem brand colors.
 */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@300;400;500;600;700&family=Inter:wght@400;500;600;700&display=swap');

/* =============================================================================
   DESIGN TOKENS
   ============================================================================= */

:root {
  /* Brain-Stem Brand Colors - Professional Deep Blue */
  --primary: #1e3a5f;
  --primary-light: #2d5a87;
  --primary-dark: #152a45;
  --primary-rgb: 30, 58, 95;

  --secondary: #0891b2;
  --secondary-light: #22d3ee;
  --secondary-dark: #0e7490;
  --secondary-rgb: 8, 145, 178;

  --accent: #10b981;
  --accent-light: #34d399;
  --accent-dark: #059669;
  --accent-rgb: 16, 185, 129;

  --heading-color: var(--primary);

  /* Neutrals */
  --white: #ffffff;
  --white-rgb: 255, 255, 255;
  --black: #000000;
  --black-rgb: 0, 0, 0;
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --gray-900: #0f172a;

  /* Semantic */
  --success: var(--accent);
  --warning: #f59e0b;
  --error: #ef4444;

  /* Page colors */
  --bg: var(--white);
  --surface: var(--gray-50);
  --text: var(--gray-800);
  --muted: var(--gray-500);
  --card-bg: var(--gray-100);

  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;
  --radius-2xl: 1rem;
  --radius-3xl: 1.5rem;
  --radius-full: 9999px;

  /* Borders */
  --border: rgba(var(--primary-rgb), 0.15);
  --border-hover: rgba(var(--primary-rgb), 0.25);
  --radius: var(--radius-2xl);

  /* Links */
  --link: var(--primary);
  --link-hover: var(--primary-dark);

  /* Typography */
  --font-display: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-heading: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Font Sizes */
  --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;

  /* Line Heights */
  --leading-tight: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;

  /* 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;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 18px 50px rgba(var(--primary-rgb), 0.08);
  --shadow-xl: 0 24px 64px rgba(var(--primary-rgb), 0.12);

  /* Nav */
  --nav-bg: var(--primary);
  --nav-text: var(--white);
  --nav-hover-bg: rgba(var(--white-rgb), 0.15);
  --nav-active-bg: rgba(var(--white-rgb), 0.2);
  --nav-active-border: rgba(var(--white-rgb), 0.3);

  /* Footer */
  --footer-bg: var(--primary);
  --footer-text: var(--white);
}

/* =============================================================================
   RESET & BASE
   ============================================================================= */

*, *::before, *::after {
  box-sizing: border-box;
}

html, body {
  height: 100%;
  margin: 0;
}

body {
  font-family: var(--font-body);
  line-height: var(--leading-normal);
  color: var(--text);
  background:
    radial-gradient(1200px 500px at 50% 0%, rgba(var(--primary-rgb), 0.08), transparent 60%),
    radial-gradient(900px 380px at 85% 10%, rgba(var(--secondary-rgb), 0.06), transparent 55%),
    var(--bg);
}

a {
  color: var(--link);
  text-decoration: none;
}
a:hover {
  color: var(--link-hover);
}

/* =============================================================================
   TYPOGRAPHY
   ============================================================================= */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 400;
  color: var(--heading-color);
  margin: 0;
  line-height: var(--leading-tight);
}

h1, .h1 {
  font-size: var(--text-6xl);
  letter-spacing: -0.02em;
  text-align: center;
  margin-bottom: var(--space-6);
}

h2, .h2 {
  font-size: var(--text-4xl);
  letter-spacing: -0.02em;
  text-align: center;
  margin-bottom: var(--space-4);
}

h3, .h3 {
  font-size: var(--text-xl);
  letter-spacing: -0.01em;
}

.tagline {
  font-family: var(--font-heading);
  font-weight: 100;
  font-size: var(--text-2xl);
  color: var(--muted);
  line-height: var(--leading-normal);
  text-align: center;
}

.section-question {
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  font-weight: 300;
  color: var(--primary);
  text-align: center;
  margin-top: var(--space-12);
  margin-bottom: var(--space-4);
}

/* =============================================================================
   LAYOUT
   ============================================================================= */

.container {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 20px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 14px;
}

.col-3  { grid-column: span 3; }
.col-4  { grid-column: span 4; }
.col-6  { grid-column: span 6; }
.col-8  { grid-column: span 8; }
.col-12 { grid-column: span 12; }

@media (max-width: 900px) {
  .col-3, .col-4, .col-6, .col-8 { grid-column: span 12; }

  h1, .h1 {
    font-size: var(--text-4xl);
  }

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

  .tagline {
    font-size: var(--text-xl);
  }
}

/* =============================================================================
   NAVIGATION
   ============================================================================= */

.skip-link {
  position: absolute;
  left: -999px;
  top: 10px;
  background: var(--primary);
  color: var(--white);
  padding: 10px 12px;
  border-radius: var(--radius-lg);
  z-index: 1000;
}
.skip-link:focus {
  left: 10px;
}

.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--nav-bg);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 14px 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}
.brand img {
  height: 36px;
  width: auto;
  object-fit: contain;
}
.brand span {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  color: var(--nav-text);
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
  align-items: center;
  justify-content: flex-end;
}
.nav-links a {
  color: var(--nav-text);
}

.tab {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  color: var(--nav-text);
  font-weight: 600;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: all 150ms ease;
}
.tab:hover {
  background: var(--nav-hover-bg);
  color: var(--nav-text);
}
.tab[aria-current="page"] {
  background: var(--nav-active-bg);
  border-color: var(--nav-active-border);
  color: var(--nav-text);
}

.tab-login {
  background: rgba(var(--white-rgb), 0.15);
  border: 1px solid rgba(var(--white-rgb), 0.3);
  margin-left: var(--space-2);
}
.tab-login:hover {
  background: rgba(var(--white-rgb), 0.25);
}

.tab-avatar {
  display: none;
  margin-left: var(--space-2);
  text-decoration: none;
}
.tab-avatar-img {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid transparent;
  transition: border-color 150ms ease;
}
.tab-avatar:hover .tab-avatar-img {
  border-color: rgba(var(--white-rgb), 0.5);
}
#tab-user-name {
  max-width: 120px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* =============================================================================
   BANNER
   ============================================================================= */

.banner {
  position: relative;
  background: url('/img/melbourne.png') center center no-repeat;
  background-size: cover;
  min-height: 280px;
  display: flex;
  align-items: center;
}
.banner-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.85) 0%, rgba(var(--secondary-rgb), 0.85) 100%);
}
.banner-content {
  position: relative;
  z-index: 1;
  width: 100%;
}
.banner-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-5xl);
  color: var(--white);
  text-align: center;
  margin-bottom: var(--space-4);
}

.banner-text {
  font-family: var(--font-heading);
  font-weight: 300;
  font-size: 32px;
  color: var(--white);
  line-height: var(--leading-normal);
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

@media (max-width: 768px) {
  .banner-text {
    font-size: 24px;
  }
}

/* =============================================================================
   SECTIONS
   ============================================================================= */

.section {
  padding: 48px 0;
}
.section p {
  margin: 0 0 12px;
  color: var(--muted);
}

.section-alt {
  background: var(--gray-50);
}

.spacer {
  border: none;
  border-top: 1px solid var(--border);
  margin: var(--space-8) auto;
  max-width: 200px;
}

/* =============================================================================
   CARDS
   ============================================================================= */

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  transition: transform 150ms ease, box-shadow 150ms ease, border-color 150ms ease;
  box-shadow: var(--shadow-lg);
}
.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
  border-color: var(--border-hover);
}
.card h3 {
  font-size: var(--text-xl);
  color: var(--heading-color);
  margin-bottom: var(--space-3);
}
.card p,
.card li {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.6;
}
.card ul {
  margin: 8px 0 0;
  padding-left: 18px;
}
.card .bold {
  font-weight: 700;
  color: var(--gray-700);
}

/* Special card variants */
.card-ai {
  background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.08) 0%, rgba(var(--secondary-rgb), 0.08) 100%);
  border-color: rgba(var(--primary-rgb), 0.2);
}

.card-experience {
  background: linear-gradient(135deg, rgba(var(--accent-rgb), 0.08) 0%, rgba(var(--secondary-rgb), 0.08) 100%);
  border-color: rgba(var(--accent-rgb), 0.2);
}

.card-problem {
  text-align: center;
  background: var(--white);
}
.card-problem .card-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto var(--space-4);
  background: rgba(var(--primary-rgb), 0.1);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
}
.card-problem .card-icon svg {
  width: 28px;
  height: 28px;
  color: var(--primary);
}

.card-benefit {
  position: relative;
  padding-left: 80px;
  background: var(--white);
}
.card-benefit .benefit-number {
  position: absolute;
  left: 20px;
  top: 20px;
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: var(--white);
  font-family: var(--font-heading);
  font-size: 24px;
  font-weight: 700;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
}

.card-stem,
.card-brain {
  background-color: var(--gray-200);
  background-size: cover;
  background-position: center;
}
.card-stem {
  background-image: linear-gradient(135deg, rgba(var(--primary-rgb), 0.1) 0%, transparent 50%);
}
.card-brain {
  background-image: linear-gradient(135deg, rgba(var(--secondary-rgb), 0.1) 0%, transparent 50%);
}
.card-stem h3,
.card-brain h3,
.card-core h3 {
  font-weight: 300;
  font-size: var(--text-2xl);
}
.card-stem p,
.card-stem li,
.card-brain p,
.card-brain li,
.card-core p,
.card-core li {
  color: var(--gray-700);
}

.card-core {
  background-color: var(--gray-300);
  background-image: linear-gradient(135deg, rgba(var(--primary-rgb), 0.05) 0%, rgba(var(--secondary-rgb), 0.05) 100%);
  position: relative;
}

/* =============================================================================
   BUTTONS
   ============================================================================= */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-xl);
  border: 1px solid var(--border);
  background: var(--white);
  color: var(--primary);
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  transition: all 150ms ease;
  text-decoration: none;
  box-shadow: 0 10px 30px rgba(var(--primary-rgb), 0.05);
}
.btn:hover {
  background: rgba(var(--primary-rgb), 0.06);
  color: var(--primary);
}

.btn.primary {
  border: none;
  color: var(--white);
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
}
.btn.primary:hover {
  filter: brightness(1.05);
  color: var(--white);
}

.btn-lg {
  padding: 16px 32px;
  font-size: 18px;
  border-radius: var(--radius-2xl);
}

/* =============================================================================
   CTA SECTION
   ============================================================================= */

.cta-section {
  text-align: center;
  padding: var(--space-8) 0;
}

.cta-subtext {
  margin-top: var(--space-4);
  color: var(--muted);
  font-size: var(--text-sm);
}

/* =============================================================================
   FOOTER
   ============================================================================= */

.footer {
  background: var(--footer-bg);
  padding: 1em 0;
  color: var(--footer-text);
  font-size: 13px;
}
.footer .container {
  max-width: 1000px;
}
.footer a {
  color: var(--footer-text);
  font-weight: 600;
  margin-left: var(--space-4);
}
.footer a:hover {
  opacity: 0.8;
  color: var(--footer-text);
}
.footer .muted {
  opacity: 0.7;
}

.kicker {
  font-weight: 900;
  letter-spacing: -0.01em;
}

/* =============================================================================
   UTILITIES
   ============================================================================= */

.text-center { text-align: center; }
.bold { font-weight: 700; }
.mt-3  { margin-top: var(--space-3); }
.mt-8  { margin-top: var(--space-4); }
.mt-12 { margin-top: var(--space-5); }
.mt-16 { margin-top: var(--space-6); }
.mt-24 { margin-top: var(--space-12); }
.pt-2  { padding-top: 1rem; }
.ml-auto { margin-left: auto; }
.loading-placeholder { text-align: center; padding: 2rem 0; }
.empty-placeholder { text-align: center; padding: 3rem 1rem; }

.row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
  justify-content: center;
}
.justify-between {
  justify-content: space-between;
}

/* =============================================================================
   AUTH PAGES (Login, Register, Reset)
   ============================================================================= */

.auth-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.auth-page main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-8) var(--space-4);
}

.auth-container {
  width: 100%;
  max-width: 420px;
}

.auth-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow-xl);
}

.back-link {
  display: inline-block;
  font-size: var(--text-sm);
  color: var(--muted);
  margin-bottom: var(--space-6);
  transition: color 150ms ease;
}
.back-link:hover {
  color: var(--primary);
}

.auth-header {
  text-align: center;
  margin-bottom: var(--space-8);
}
.auth-header h1 {
  font-size: var(--text-3xl);
  margin-bottom: var(--space-2);
}
.auth-header p {
  color: var(--muted);
  font-size: var(--text-base);
  margin: 0;
}

.form-group {
  margin-bottom: var(--space-5);
}
.form-group label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text);
  margin-bottom: var(--space-2);
}
.form-group input[type="email"],
.form-group input[type="password"],
.form-group input[type="text"] {
  width: 100%;
  padding: 12px 14px;
  font-size: var(--text-base);
  font-family: var(--font-body);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
  color: var(--text);
  transition: border-color 150ms ease, box-shadow 150ms ease;
}
.form-group input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(var(--primary-rgb), 0.1);
}
.form-group input::placeholder {
  color: var(--gray-400);
}

.password-input-wrapper {
  position: relative;
}
.password-input-wrapper input {
  padding-right: 48px;
}
.password-toggle {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--muted);
  cursor: pointer;
  padding: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.password-toggle:hover {
  color: var(--primary);
}
.password-toggle .hidden {
  display: none;
}

.checkbox-group {
  margin-bottom: var(--space-6);
}
.checkbox-label {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--muted);
  cursor: pointer;
}
.checkbox-label input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
}

#form-message {
  margin-bottom: var(--space-4);
}
#form-message:empty {
  display: none;
}

.auth-submit {
  width: 100%;
  padding: 14px 20px;
  font-size: var(--text-base);
  font-weight: 600;
  font-family: var(--font-body);
  color: var(--white);
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: filter 150ms ease, transform 150ms ease;
}
.auth-submit:hover {
  filter: brightness(1.05);
}
.auth-submit:active {
  transform: scale(0.98);
}

.auth-links {
  text-align: center;
  margin-top: var(--space-6);
  font-size: var(--text-sm);
}
.auth-links a {
  color: var(--primary);
  font-weight: 500;
}
.auth-links a:hover {
  color: var(--secondary);
}
.auth-divider {
  color: var(--gray-300);
  margin: 0 var(--space-3);
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}
.form-hint {
  display: block;
  margin-top: var(--space-1);
  font-size: 0.8rem;
  color: var(--gray-400);
}
.success-message {
  padding: 0.75rem 1rem;
  margin-bottom: 1rem;
  border-radius: 6px;
  background: #d1fae5;
  color: #047857;
  font-size: 0.9rem;
}
.error-message {
  padding: 0.75rem 1rem;
  margin-bottom: 1rem;
  border-radius: 6px;
  background: #fee2e2;
  color: #b91c1c;
  font-size: 0.9rem;
}

/* =============================================================================
   IMPERSONATION BANNER
   ============================================================================= */

.impersonation-banner {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10000;
  background: var(--warning, #f59e0b);
  color: #fff;
  text-align: center;
  padding: 0.5rem 1rem;
  font-size: var(--text-sm, 0.875rem);
  font-family: var(--font-body, sans-serif);
  font-weight: 500;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.impersonation-banner strong {
  font-weight: 700;
}

.impersonation-banner button {
  margin-left: 1rem;
  padding: 0.25rem 0.75rem;
  background: rgba(255, 255, 255, 0.2);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 4px;
  cursor: pointer;
  font-size: var(--text-sm, 0.875rem);
  font-weight: 600;
  transition: background 0.15s;
}

.impersonation-banner button:hover {
  background: rgba(255, 255, 255, 0.35);
}

body.impersonating {
  padding-top: 2.5rem;
}

body.impersonating .nav {
  top: 2.5rem;
}