/* ---------- CSS VARIABLES (Light/Dark) ---------- */
:root {
  --bg-body: #f8fafc;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --card-bg: rgba(255, 255, 255, 0.7);
  --card-border: rgba(0, 0, 0, 0.05);
  --chip-bg: #ffffff;
  --chip-border: #e2e8f0;
  --input-bg: #ffffff;
  --input-border: #cbd5e1;
  --footer-border: #e2e8f0;
  --gradient-start: #4f46e5;
  --gradient-end: #c084fc;
  --btn-primary: #4f46e5;
  --btn-primary-hover: #4338ca;
  --glass-bg: rgba(255, 255, 255, 0.7);
  --hero-glow-a: rgba(79, 70, 229, 0.18);
  --hero-glow-b: rgba(192, 132, 252, 0.14);
  --shadow-primary: rgba(79, 70, 229, 0.28);
}

body.theme-dark {
  --bg-body: #0a0c15;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --card-bg: rgba(30, 41, 59, 0.6);
  --card-border: rgba(255, 255, 255, 0.08);
  --chip-bg: #1e293b;
  --chip-border: #334155;
  --input-bg: #0f172a;
  --input-border: #334155;
  --footer-border: #1e293b;
  --gradient-start: #818cf8;
  --gradient-end: #c084fc;
  --btn-primary: #6366f1;
  --btn-primary-hover: #4f46e5;
  --glass-bg: rgba(30, 41, 59, 0.4);
  --hero-glow-a: rgba(99, 102, 241, 0.22);
  --hero-glow-b: rgba(192, 132, 252, 0.16);
  --shadow-primary: rgba(99, 102, 241, 0.38);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, sans-serif;
  background:
    radial-gradient(circle at 15% 8%, var(--hero-glow-a), transparent 28rem),
    radial-gradient(circle at 88% 0%, var(--hero-glow-b), transparent 26rem),
    var(--bg-body);
  color: var(--text-primary);
  line-height: 1.5;
  transition: background 0.2s, color 0.2s;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem 4rem;
}

/* gradient text */
.gradient-text {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* navigation */
nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 2rem 0;
  flex-wrap: wrap;
  gap: 1rem;
}

.logo {
  display: inline-flex;
  align-items: center;
  width: 92px;
  min-height: 25px;
  line-height: 0;
  text-decoration: none;
}

.logo img {
  width: 92px;
  height: auto;
  display: block;
}

body.theme-dark .logo-light,
body.theme-light .logo-dark {
  display: none;
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--gradient-start);
}

.btn-outline {
  border: 1px solid var(--input-border);
  padding: 0.5rem 1.2rem;
  border-radius: 40px;
  background: transparent;
}

.btn-outline:hover {
  background: var(--chip-bg);
  border-color: var(--gradient-start);
}

/* theme toggle button */
#theme-toggle {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 0.4rem 0.8rem;
  border-radius: 40px;
  color: var(--text-primary);
  transition: all 0.2s;
}

#theme-toggle:hover {
  transform: scale(1.02);
  border-color: var(--gradient-start);
}

/* buttons */
.btn-primary {
  background: var(--btn-primary);
  color: white;
  min-height: 52px;
  padding: 0.95rem 2rem;
  border-radius: 60px;
  font-weight: 700;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  border: none;
  cursor: pointer;
  font-size: 1.05rem;
  box-shadow: 0 16px 30px -14px var(--shadow-primary);
}

.btn-primary:hover {
  background: var(--btn-primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 20px 34px -16px var(--shadow-primary);
}

[hidden] {
  display: none !important;
}

/* hero */
.hero {
  text-align: center;
  padding: 5rem 0 3rem;
}

.hero h1 {
  font-size: clamp(2.6rem, 6vw, 4.9rem);
  font-weight: 800;
  line-height: 1.05;
  margin-bottom: 1.5rem;
  max-width: 920px;
  margin-left: auto;
  margin-right: auto;
}

.hero-tagline {
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 2.25rem;
}

.feature-chips {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
  margin: 2.75rem 0 2rem;
}

.chip {
  background: var(--chip-bg);
  padding: 0.55rem 1.1rem;
  border-radius: 60px;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-primary);
  border: 1px solid var(--chip-border);
}

.chip span {
  color: var(--gradient-start);
  font-weight: 600;
}

/* phone mockup container */
.mockup-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0 3rem;
}

.phone-mockup {
  background: var(--card-bg);
  backdrop-filter: blur(12px);
  border: 1px solid var(--card-border);
  border-radius: 40px;
  padding: 0.9rem;
  text-align: center;
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.phone-mockup:hover {
  border-color: var(--gradient-start);
  transform: scale(1.03) translateY(-8px);
}

.mockup-screen {
  background: var(--input-bg);
  border-radius: 30px;
  min-height: 420px;
  overflow: hidden;
  border: 1px solid var(--card-border);
}

.mockup-placeholder-text {
  color: var(--text-muted);
  font-size: 0.9rem;
  text-align: center;
}

.screen-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--card-border);
  padding: 1rem;
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
}

.screen-body {
  display: grid;
  gap: 0.85rem;
  padding: 1rem;
}

.mini-card {
  border: 1px solid var(--card-border);
  border-radius: 20px;
  background: var(--glass-bg);
  padding: 0.9rem;
  text-align: left;
}

.mini-card strong {
  display: block;
  margin-bottom: 0.35rem;
  color: var(--text-primary);
  font-size: 0.95rem;
}

.mini-card p {
  color: var(--text-secondary);
  font-size: 0.86rem;
}

.mockup-badge {
  margin-top: 1rem;
  font-size: 0.8rem;
  color: var(--gradient-start);
  font-weight: 500;
}

.phone-mockup img {
  max-width: 100%;
  border-radius: 28px;
  display: block;
}

/* email capture */
.early-access {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  border: 1px solid var(--card-border);
  border-radius: 48px;
  padding: 2rem;
  margin: 2rem 0;
  text-align: center;
}

.early-access h3 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.early-access p {
  color: var(--text-secondary);
  margin-bottom: 1.2rem;
}

.email-form {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.8rem;
}

.email-form input {
  padding: 0.8rem 1.5rem;
  border-radius: 60px;
  border: 1px solid var(--input-border);
  background: var(--input-bg);
  color: var(--text-primary);
  width: 280px;
  font-size: 0.95rem;
}

.email-form input:focus {
  outline: none;
  border-color: var(--gradient-start);
}

/* section headings */
.section-heading {
  font-size: clamp(2rem, 4vw, 2.4rem);
  font-weight: 700;
  margin-bottom: 2rem;
  text-align: center;
}

/* steps grid */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin: 3rem 0 4rem;
}

.step-card {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  border: 1px solid var(--card-border);
  border-radius: 28px;
  padding: 2rem;
  transition: transform 0.2s;
  position: relative;
  background-clip: padding-box;
}

.step-card:hover {
  transform: translateY(-4px);
}

.step-card::before {
  content: '';
  position: absolute;
  top: -1px;
  bottom: -1px;
  left: -1px;
  right: -1px;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  border-radius: 29px;
  z-index: -1;
  opacity: 0;
  transition: opacity 0.3s;
}

.step-card:hover::before {
  opacity: 0.3;
}

.step-number {
  width: 40px;
  height: 40px;
  background: var(--gradient-start);
  border-radius: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  margin-bottom: 1.2rem;
  color: white;
}

.step-card h3 {
  font-size: 1.5rem;
  margin-bottom: 0.8rem;
}

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

/* two column layout */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin: 4rem 0;
}

.preview-card {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  border: 1px solid var(--card-border);
  border-radius: 32px;
  padding: 1.8rem;
  transition: transform 0.2s;
}

.preview-card:hover {
  transform: translateY(-3px);
}

.preview-card h3 {
  font-size: 1.6rem;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.chat-mock {
  background: var(--input-bg);
  border-radius: 24px;
  padding: 1.2rem;
  margin-top: 1rem;
}

.message {
  background: var(--chip-bg);
  border-radius: 20px;
  padding: 0.7rem 1rem;
  margin-bottom: 0.8rem;
  width: fit-content;
  max-width: 85%;
  color: var(--text-primary);
}

.message.own {
  background: var(--gradient-start);
  color: white;
  margin-left: auto;
}

.placeholder-div {
  border: 2px dashed var(--gradient-start);
  background: var(--glass-bg);
  border-radius: 24px;
  padding: 3rem 1.5rem;
  text-align: center;
  color: var(--gradient-start);
  font-weight: 500;
}

/* footer */
footer {
  border-top: 1px solid var(--footer-border);
  margin-top: 4rem;
  padding: 3rem 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 2rem;
}

.footer-links a {
  display: block;
  color: var(--text-muted);
  text-decoration: none;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}

.footer-links a:hover {
  color: var(--text-primary);
}

.copyright {
  text-align: center;
  margin-top: 2.5rem;
  color: var(--text-muted);
  font-size: 0.8rem;
}

/* floating CTA */
.floating-cta {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: var(--btn-primary);
  padding: 0.8rem 1.6rem;
  border-radius: 60px;
  font-weight: 700;
  color: white;
  text-decoration: none;
  box-shadow: 0 16px 28px -14px var(--shadow-primary);
  z-index: 100;
  transition: 0.2s;
}

.floating-cta:hover {
  background: var(--btn-primary-hover);
  transform: scale(1.02);
}

/* ---------- AUTH LOADING OVERLAY ---------- */
#page-loader {
  position: fixed;
  inset: 0;
  z-index: 500;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  background: var(--bg-body);
  transition: opacity 0.3s ease;
}

#page-loader .loader-logo {
  width: 80px;
  height: auto;
}

#page-loader .loader-ring {
  width: 36px;
  height: 36px;
  border: 3px solid rgba(99, 102, 241, 0.2);
  border-top-color: var(--gradient-start);
  border-radius: 50%;
  animation: spin 0.75s linear infinite;
}

body:not(.auth-loading) #page-loader {
  opacity: 0;
  pointer-events: none;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* hide auth CTAs while session is being confirmed */
body.auth-loading [data-auth-guest],
body.auth-loading [data-auth-user] {
  visibility: hidden;
  pointer-events: none;
}

/* animations */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.6s ease-out;
}

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

@media (max-width: 760px) {
  .two-col {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: 2.35rem;
  }

  .container {
    padding: 0 1.2rem 5.5rem;
  }

  nav {
    flex-direction: column;
    align-items: flex-start;
  }

  .nav-links {
    gap: 0.8rem;
    justify-content: flex-start;
  }

  .mockup-screen {
    min-height: 320px;
  }

  .floating-cta {
    left: 1rem;
    right: 1rem;
    bottom: 1rem;
    text-align: center;
  }
}