/* ==========================================
   Switchdays Design System
   Shared styles for all pages
   ========================================== */

/* ==========================================
   Self-hosted fonts (latin subset)
   ========================================== */
@font-face {
  font-family: 'DM Sans';
  font-style: normal;
  font-weight: 100 1000;
  font-display: swap;
  src: url(fonts/dm-sans-latin.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'Fraunces';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url(fonts/fraunces-600-latin.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

/* ==========================================
   Custom Properties
   ========================================== */
:root {
  /* Background surfaces - warm stone tones */
  --color-bg: #e8e4df;
  --color-hero-bg: #efebe6;
  --color-surface: #f5f2ed;
  --color-surface-raised: #ebe8e3;
  /* Text - warm near-black family */
  --color-text: #2c2520;
  --color-text-secondary: #7a716a;
  --color-accent: #2563eb;
  --color-accent-hover: #1d4ed8;
  --color-accent-subtle: #eff6ff;
  /* Borders - warm grey family */
  --color-border: #d9d4ce;
  --color-border-strong: #c9c4be;
  --color-success: #059669;
  /* Calendar "yours" - richer honey amber */
  --color-calendar-yours: #e2a842;
  --color-calendar-yours-text: #5c4209;
  --color-calendar-yours-bg: #f7f0e0;
  /* Calendar "theirs" - darker warm grey (not cool slate) */
  --color-calendar-theirs: #ccc8c2;
  --color-calendar-theirs-text: #5c564f;
  --color-calendar-theirs-bg: #e2ded8;
  /* Neumorphic surfaces - warm family */
  --color-neu-surface: #e8e4df;
  --color-neu-panel: #d9d4ce;
  --color-neu-highlight: rgba(255, 255, 250, 0.7);
  --color-neu-shadow: rgba(80, 70, 60, 0.2);
  --color-neu-shadow-inset: rgba(80, 70, 60, 0.25);
  --font-display: 'Fraunces', Georgia, serif;
  --font-body: 'DM Sans', system-ui, sans-serif;

  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  --max-width: 64rem;
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -1px rgba(0,0,0,0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -2px rgba(0,0,0,0.04);
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #1a1a1d;
    --color-hero-bg: #1e1e21;
    --color-surface: #232326;
    --color-surface-raised: #2d2d30;
    --color-text: #fafaf9;
    --color-text-secondary: #a8a29e;
    --color-accent: #60a5fa;
    --color-accent-hover: #93c5fd;
    --color-accent-subtle: #1e3a5f;
    --color-border: #3a3a3d;
    --color-border-strong: #4a4a4d;
    --color-calendar-yours: #f5c542;
    --color-calendar-yours-text: #6b4b0a;
    --color-calendar-yours-bg: #2a2418;
    --color-calendar-theirs: #566070;
    --color-calendar-theirs-text: #e2e8f0;
    --color-calendar-theirs-bg: #1e293b;
    /* Neumorphic surface variables for dark mode */
    --color-neu-surface: #2d2d30;
    --color-neu-panel: #232326;
    --color-neu-highlight: rgba(255, 255, 255, 0.08);
    --color-neu-shadow: rgba(0, 0, 0, 0.5);
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.4), 0 2px 4px -1px rgba(0,0,0,0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.5), 0 4px 6px -2px rgba(0,0,0,0.3);
  }
}

/* Theme override via data-theme attribute (set by theme toggle) */
html[data-theme="light"] {
  --color-bg: #e8e4df;
  --color-hero-bg: #efebe6;
  --color-surface: #f5f2ed;
  --color-surface-raised: #ebe8e3;
  --color-text: #2c2520;
  --color-text-secondary: #7a716a;
  --color-accent: #2563eb;
  --color-accent-hover: #1d4ed8;
  --color-accent-subtle: #eff6ff;
  --color-border: #d9d4ce;
  --color-border-strong: #c9c4be;
  --color-success: #059669;
  --color-calendar-yours: #e2a842;
  --color-calendar-yours-text: #5c4209;
  --color-calendar-yours-bg: #f7f0e0;
  --color-calendar-theirs: #ccc8c2;
  --color-calendar-theirs-text: #5c564f;
  --color-calendar-theirs-bg: #e2ded8;
  --color-neu-surface: #e8e4df;
  --color-neu-panel: #d9d4ce;
  --color-neu-highlight: rgba(255, 255, 250, 0.7);
  --color-neu-shadow: rgba(80, 70, 60, 0.2);
  --color-neu-shadow-inset: rgba(80, 70, 60, 0.25);
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -1px rgba(0,0,0,0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -2px rgba(0,0,0,0.04);
}

html[data-theme="dark"] {
  --color-bg: #1a1a1d;
  --color-hero-bg: #1e1e21;
  --color-surface: #232326;
  --color-surface-raised: #2d2d30;
  --color-text: #fafaf9;
  --color-text-secondary: #a8a29e;
  --color-accent: #60a5fa;
  --color-accent-hover: #93c5fd;
  --color-accent-subtle: #1e3a5f;
  --color-border: #3a3a3d;
  --color-border-strong: #4a4a4d;
  --color-calendar-yours: #f5c542;
  --color-calendar-yours-text: #6b4b0a;
  --color-calendar-yours-bg: #2a2418;
  --color-calendar-theirs: #566070;
  --color-calendar-theirs-text: #e2e8f0;
  --color-calendar-theirs-bg: #1e293b;
  --color-neu-surface: #2d2d30;
  --color-neu-panel: #232326;
  --color-neu-highlight: rgba(255, 255, 255, 0.08);
  --color-neu-shadow: rgba(0, 0, 0, 0.5);
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.4), 0 2px 4px -1px rgba(0,0,0,0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.5), 0 4px 6px -2px rgba(0,0,0,0.3);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

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

/* Prevent iOS double-tap zoom on interactive elements */
button, a, input, select, textarea, [role="button"], .month-grid__day, .pattern-grid__day {
  touch-action: manipulation;
}

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

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  min-height: 100vh;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  /* Sticky footer pattern */
  display: flex;
  flex-direction: column;
}

/* Main content grows to push footer to bottom */
main {
  flex-grow: 1;
}

img { max-width: 100%; height: auto; display: block; }

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

/* Focus styles for a11y */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Skip link */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-md);
  background: var(--color-accent);
  color: white;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  z-index: 1000;
  font-weight: 500;
}
.skip-link:focus {
  top: var(--space-md);
}

/* ==========================================
   Layout
   ========================================== */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* ==========================================
   Header
   ========================================== */
.header {
  padding: var(--space-lg) 0;
  background: color-mix(in srgb, var(--color-bg) 85%, transparent);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid color-mix(in srgb, var(--color-border) 50%, transparent);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-family: var(--font-display);
  font-size: 1.375rem;
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: -0.02em;
}
.logo:hover { text-decoration: none; }

.header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.header__link {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  text-decoration: none;
}

.header__link:hover {
  color: var(--color-text);
}

.header__cta {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-accent);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  transition: background 0.15s ease;
}

.header__cta:hover {
  background: var(--color-accent-subtle);
  text-decoration: none;
}

/* ==========================================
   Hero
   ========================================== */
.hero {
  padding: var(--space-3xl) 0 var(--space-2xl);
  background: var(--color-bg);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -5%;
  left: 50%;
  transform: translateX(-50%);
  width: 120%;
  height: 50%;
  background: radial-gradient(ellipse at center, rgba(245, 197, 66, 0.12) 0%, transparent 65%);
  pointer-events: none;
}

@media (prefers-color-scheme: dark) {
  .hero::before {
    background: radial-gradient(ellipse at center, rgba(245, 197, 66, 0.10) 0%, transparent 65%);
  }
}

html[data-theme="dark"] .hero::before {
  background: radial-gradient(ellipse at center, rgba(245, 197, 66, 0.10) 0%, transparent 65%);
}

html[data-theme="light"] .hero::before {
  background: radial-gradient(ellipse at center, rgba(245, 197, 66, 0.12) 0%, transparent 65%);
}

.hero .container {
  position: relative;
  z-index: 1;
}

.hero__inner {
  max-width: 42rem;
  text-align: center;
  margin: 0 auto var(--space-sm);
}

.hero__credibility {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
  opacity: 0.6;
  letter-spacing: 0.02em;
  margin-bottom: var(--space-lg);
}

.hero__tagline {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 7vw, 3.5rem);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin-bottom: var(--space-md);
}

.hero__subhead {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
}

.hero__description {
  font-size: 1.0625rem;
  color: var(--color-text);
  opacity: 0.7;
  margin: 0 auto var(--space-xl);
  line-height: 1.5;
  letter-spacing: 0.01em;
}

.hero__tagline-secondary {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  margin-top: var(--space-2xl);
  margin-bottom: 0;
  text-align: center;
  font-style: italic;
  max-width: 30rem;
  margin-inline: auto;
}

/* ==========================================
   Signup Form
   ========================================== */
.signup-form {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-sm);
  max-width: 28rem;
  margin: 0 auto;
}

.signup-form__input {
  flex: 1 1 200px;
  padding: var(--space-md) var(--space-lg);
  font-family: inherit;
  font-size: 1rem;
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  box-shadow: var(--shadow-sm);
}
.signup-form__input::placeholder {
  color: var(--color-text-secondary);
}
.signup-form__input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-subtle);
  outline: none;
}

.signup-form__button {
  padding: var(--space-md) var(--space-2xl);
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  color: white;
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-hover) 100%);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  box-shadow: 0 4px 14px -3px rgba(29, 78, 216, 0.4);
}
.signup-form__button:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px -3px rgba(29, 78, 216, 0.5);
}
.signup-form__button:active {
  transform: translateY(0) scale(0.98);
}

.signup-form__note {
  width: 100%;
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  margin-top: var(--space-xs);
  text-align: center;
}

.signup-form--hero {
  margin-top: 0;
}

/* ==========================================
   Calendar Visual (Hero)
   ========================================== */
.calendar-demo {
  margin-top: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  position: relative;
  z-index: 2;
}

.calendar-demo__window {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow:
    0 25px 50px -12px rgba(0, 0, 0, 0.18),
    0 12px 24px -8px rgba(0, 0, 0, 0.1),
    0 0 0 1px rgba(0, 0, 0, 0.04);
  overflow: hidden;
  max-width: 56rem;
  width: 100%;
  transform: perspective(1000px) rotateX(2deg);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

@media (prefers-color-scheme: dark) {
  .calendar-demo__window {
    box-shadow:
      0 25px 50px -12px rgba(0, 0, 0, 0.5),
      0 12px 24px -8px rgba(0, 0, 0, 0.4),
      0 0 0 1px rgba(255, 255, 255, 0.05),
      0 0 80px -20px rgba(245, 197, 66, 0.1);
  }
}

html[data-theme="dark"] .calendar-demo__window {
  box-shadow:
    0 25px 50px -12px rgba(0, 0, 0, 0.5),
    0 12px 24px -8px rgba(0, 0, 0, 0.4),
    0 0 0 1px rgba(255, 255, 255, 0.05),
    0 0 80px -20px rgba(245, 197, 66, 0.1);
}

html[data-theme="light"] .calendar-demo__window {
  box-shadow:
    0 25px 50px -12px rgba(0, 0, 0, 0.18),
    0 12px 24px -8px rgba(0, 0, 0, 0.1),
    0 0 0 1px rgba(0, 0, 0, 0.04);
}

.calendar-demo__window:hover {
  transform: perspective(1000px) rotateX(0deg) translateY(-4px);
  box-shadow:
    0 35px 60px -15px rgba(0, 0, 0, 0.22),
    0 16px 32px -8px rgba(0, 0, 0, 0.12),
    0 0 0 1px rgba(0, 0, 0, 0.04);
}

@media (prefers-color-scheme: dark) {
  .calendar-demo__window:hover {
    box-shadow:
      0 35px 60px -15px rgba(0, 0, 0, 0.6),
      0 16px 32px -8px rgba(0, 0, 0, 0.5),
      0 0 0 1px rgba(255, 255, 255, 0.08),
      0 0 100px -20px rgba(245, 197, 66, 0.15);
  }
}

html[data-theme="dark"] .calendar-demo__window:hover {
  box-shadow:
    0 35px 60px -15px rgba(0, 0, 0, 0.6),
    0 16px 32px -8px rgba(0, 0, 0, 0.5),
    0 0 0 1px rgba(255, 255, 255, 0.08),
    0 0 100px -20px rgba(245, 197, 66, 0.15);
}

html[data-theme="light"] .calendar-demo__window:hover {
  box-shadow:
    0 35px 60px -15px rgba(0, 0, 0, 0.22),
    0 16px 32px -8px rgba(0, 0, 0, 0.12),
    0 0 0 1px rgba(0, 0, 0, 0.04);
}

.calendar-demo__titlebar {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  background: var(--color-surface-raised);
  border-bottom: 1px solid var(--color-border);
}

.calendar-demo__dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-border-strong);
}
.calendar-demo__dot--red { background: #ef4444; }
.calendar-demo__dot--yellow { background: #eab308; }
.calendar-demo__dot--green { background: #22c55e; }

.calendar-demo__title {
  flex: 1;
  text-align: center;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-secondary);
}

.calendar-demo__grid {
  display: grid;
  grid-template-columns: 4rem 1fr;
}

.calendar-demo__times {
  border-right: 1px solid var(--color-border);
  padding: var(--space-md) 0;
}

.calendar-demo__time {
  height: 3.5rem;
  padding: 0 var(--space-md);
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  display: flex;
  align-items: flex-start;
}

.calendar-demo__events {
  position: relative;
  padding: var(--space-md);
  min-height: 17.5rem;
}

.calendar-event {
  position: absolute;
  left: var(--space-md);
  right: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  font-weight: 500;
  overflow: hidden;
}

.calendar-event--meeting {
  top: 0;
  height: 3rem;
  background: var(--color-accent-subtle);
  color: var(--color-accent);
  border-left: 3px solid var(--color-accent);
}

.calendar-event--switchdays {
  top: 3.5rem;
  height: 5.5rem;
  background: var(--color-calendar-yours);
  color: var(--color-calendar-yours-text);
  border-left: 3px solid #c9952a;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.calendar-event__badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  opacity: 0.8;
}

.calendar-event--blocked {
  top: 10rem;
  height: 3.5rem;
  background: var(--color-surface-raised);
  color: var(--color-text-secondary);
  border-left: 3px solid var(--color-border-strong);
  text-decoration: line-through;
  opacity: 0.6;
}

.calendar-event__conflict {
  font-size: 0.6875rem;
  color: #dc2626;
  font-weight: 600;
}

/* ==========================================
   Features
   ========================================== */
.features {
  padding: var(--space-4xl) 0;
  background: var(--color-bg);
}

.features__header {
  margin-bottom: var(--space-3xl);
  text-align: center;
}

.features__title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
}

.features__subtitle {
  color: var(--color-text-secondary);
  font-size: 1.125rem;
}

.features__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
  max-width: 52rem;
  margin: 0 auto;
}

@media (max-width: 700px) {
  .features__grid {
    grid-template-columns: 1fr;
  }
}

.feature {
  padding: var(--space-xl);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  position: relative;
  overflow: hidden;
}

.feature::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-calendar-yours) 100%);
  opacity: 0;
  transition: opacity 0.2s ease;
}

.feature:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.feature:hover::before {
  opacity: 1;
}

.feature__icon {
  width: 3rem;
  height: 3rem;
  margin-bottom: var(--space-md);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg);
}

.feature__icon svg {
  width: 24px;
  height: 24px;
}

/* Distinct feature icon colors */
.feature--calendar .feature__icon {
  background: linear-gradient(135deg, #dbeafe 0%, #eff6ff 100%);
  color: #2563eb;
}

.feature--time .feature__icon {
  background: linear-gradient(135deg, #fef3c7 0%, #fffbeb 100%);
  color: #d97706;
}

.feature--parents .feature__icon {
  background: linear-gradient(135deg, #d1fae5 0%, #ecfdf5 100%);
  color: #059669;
}

.feature--sync .feature__icon {
  background: linear-gradient(135deg, #ede9fe 0%, #f5f3ff 100%);
  color: #7c3aed;
}

@media (prefers-color-scheme: dark) {
  .feature--calendar .feature__icon {
    background: linear-gradient(135deg, #1e3a5f 0%, #1e293b 100%);
    color: #60a5fa;
  }

  .feature--time .feature__icon {
    background: linear-gradient(135deg, #451a03 0%, #292524 100%);
    color: #fbbf24;
  }

  .feature--parents .feature__icon {
    background: linear-gradient(135deg, #064e3b 0%, #1c1917 100%);
    color: #34d399;
  }

  .feature--sync .feature__icon {
    background: linear-gradient(135deg, #2e1065 0%, #1c1917 100%);
    color: #a78bfa;
  }
}

html[data-theme="dark"] .feature--calendar .feature__icon {
  background: linear-gradient(135deg, #1e3a5f 0%, #1e293b 100%);
  color: #60a5fa;
}

html[data-theme="dark"] .feature--time .feature__icon {
  background: linear-gradient(135deg, #451a03 0%, #292524 100%);
  color: #fbbf24;
}

html[data-theme="dark"] .feature--parents .feature__icon {
  background: linear-gradient(135deg, #064e3b 0%, #1c1917 100%);
  color: #34d399;
}

html[data-theme="dark"] .feature--sync .feature__icon {
  background: linear-gradient(135deg, #2e1065 0%, #1c1917 100%);
  color: #a78bfa;
}

html[data-theme="light"] .feature--calendar .feature__icon {
  background: linear-gradient(135deg, #dbeafe 0%, #eff6ff 100%);
  color: #2563eb;
}

html[data-theme="light"] .feature--time .feature__icon {
  background: linear-gradient(135deg, #fef3c7 0%, #fffbeb 100%);
  color: #d97706;
}

html[data-theme="light"] .feature--parents .feature__icon {
  background: linear-gradient(135deg, #d1fae5 0%, #ecfdf5 100%);
  color: #059669;
}

html[data-theme="light"] .feature--sync .feature__icon {
  background: linear-gradient(135deg, #ede9fe 0%, #f5f3ff 100%);
  color: #7c3aed;
}

.feature__title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.feature__description {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ==========================================
   How it Works
   ========================================== */
.how-it-works {
  padding: var(--space-4xl) 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.how-it-works__title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-3xl);
  text-align: center;
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
  counter-reset: step;
  list-style: none;
  max-width: 56rem;
  margin: 0 auto;
  position: relative;
}

/* Connecting line between steps */
.steps::before {
  content: '';
  position: absolute;
  top: 1.75rem;
  left: calc(16.67% + 1rem);
  right: calc(16.67% + 1rem);
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-calendar-yours) 100%);
  opacity: 0.3;
}

@media (max-width: 768px) {
  .steps {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }
  .steps::before {
    display: none;
  }
  .step {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
}

.step {
  counter-increment: step;
  text-align: center;
  position: relative;
}

.step__number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3.5rem;
  height: 3.5rem;
  margin: 0 auto var(--space-lg);
  font-size: 1.25rem;
  font-weight: 700;
  color: white;
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-hover) 100%);
  border-radius: 50%;
  box-shadow: 0 4px 14px -3px rgba(29, 78, 216, 0.4);
  position: relative;
  z-index: 1;
}
.step__number::before {
  content: counter(step);
}

.step__title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.step__description {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
  max-width: 18rem;
  margin: 0 auto;
}

/* ==========================================
   Schedule Pattern Visual
   ========================================== */
.pattern-demo {
  padding: var(--space-4xl) 0 var(--space-2xl);
  background: linear-gradient(180deg, #fefaf2 0%, #fef5dc 50%, #fefaf2 100%);
  position: relative;
}

@media (prefers-color-scheme: dark) {
  .pattern-demo {
    background: linear-gradient(180deg, #1c1917 0%, #292524 50%, #1c1917 100%);
  }
}

html[data-theme="dark"] .pattern-demo {
  background: linear-gradient(180deg, #1c1917 0%, #292524 50%, #1c1917 100%);
}

html[data-theme="light"] .pattern-demo {
  background: linear-gradient(180deg, #fefaf2 0%, #fef5dc 50%, #fefaf2 100%);
}

.pattern-demo__header {
  margin-bottom: var(--space-2xl);
  text-align: center;
}

.pattern-demo__title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
}

.pattern-demo__subtitle {
  color: var(--color-text-secondary);
  font-size: 1.125rem;
}

.pattern-demo__personal {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  margin-top: var(--space-xl);
  opacity: 0.7;
  font-style: italic;
  max-width: 24rem;
  margin-inline: auto;
}

.pattern-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 3px;
  max-width: 36rem;
  margin: 0 auto;
  box-shadow: var(--shadow-lg);
}

.pattern-grid__header {
  background: var(--color-surface);
  padding: var(--space-md) var(--space-sm);
  font-size: 0.75rem;
  font-weight: 600;
  text-align: center;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: 4px;
}

.pattern-grid__day {
  aspect-ratio: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  font-weight: 500;
  gap: var(--space-xs);
  border-radius: 4px;
  transition: transform 0.15s ease;
}

.pattern-grid__day:hover {
  transform: scale(1.05);
  z-index: 1;
}

.pattern-grid__day--yours {
  background: linear-gradient(135deg, var(--color-calendar-yours) 0%, #d4a832 100%);
  color: var(--color-calendar-yours-text);
}

.pattern-grid__day--theirs {
  background: var(--color-calendar-theirs);
  color: var(--color-calendar-theirs-text);
}

.pattern-grid__date {
  font-size: 1.125rem;
  font-weight: 700;
}

.pattern-grid__label {
  font-size: 0.625rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  opacity: 0.85;
  font-weight: 600;
}

.pattern-legend {
  display: flex;
  justify-content: center;
  gap: var(--space-xl);
  margin-top: var(--space-xl);
  font-size: 0.9375rem;
}

.pattern-legend__item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.pattern-legend__swatch {
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 8px;
}

.pattern-legend__swatch--yours {
  background: linear-gradient(135deg, var(--color-calendar-yours) 0%, #d4a832 100%);
  box-shadow:
    -2px -2px 4px var(--color-neu-highlight),
    2px 2px 4px var(--color-neu-shadow);
}

.pattern-legend__swatch--theirs {
  background: var(--color-calendar-theirs);
  box-shadow:
    inset 2px 2px 4px var(--color-neu-shadow),
    inset -2px -2px 4px var(--color-neu-highlight);
}

.pattern-demo .btn {
  display: block;
  width: fit-content;
  margin: var(--space-2xl) auto 0;
}

/* ==========================================
   Final CTA
   ========================================== */
.final-cta {
  padding: var(--space-4xl) 0;
  text-align: center;
  background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-surface-raised) 50%, var(--color-bg) 100%);
  position: relative;
}

.final-cta::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(ellipse at center top, var(--color-accent-subtle) 0%, transparent 60%);
  opacity: 0.4;
  pointer-events: none;
}

.final-cta .container {
  position: relative;
  z-index: 1;
}

.final-cta__title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-md);
  max-width: 38rem;
  margin-inline: auto;
}

.final-cta__description {
  color: var(--color-text-secondary);
  font-size: 1.125rem;
  margin-bottom: var(--space-xl);
  max-width: 32rem;
  margin-left: auto;
  margin-right: auto;
}

.final-cta .signup-form {
  justify-content: center;
  max-width: 32rem;
}

.final-cta__personal {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  margin-top: var(--space-xl);
  opacity: 0.7;
  font-style: italic;
  max-width: 18rem;
  margin-inline: auto;
}

/* ==========================================
   Footer
   ========================================== */
.footer {
  padding: var(--space-2xl) 0;
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
}

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

.footer__brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.footer__copyright {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.footer__tagline {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  opacity: 0.8;
  font-style: italic;
}

.footer__links {
  display: flex;
  gap: var(--space-xl);
  list-style: none;
}

.footer__link {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  transition: color 0.15s ease;
}
.footer__link:hover {
  color: var(--color-accent);
  text-decoration: none;
}

/* Theme toggle button */
.footer__theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  padding: var(--space-xs);
  cursor: pointer;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  transition: color 0.15s ease, background 0.15s ease;
}

.footer__theme-toggle:hover {
  color: var(--color-accent);
  background: var(--color-accent-subtle);
}

.footer__theme-icon {
  width: 18px;
  height: 18px;
}

/* Show sun icon in dark mode, moon icon in light mode */
.footer__theme-icon--sun { display: none; }
.footer__theme-icon--moon { display: block; }

@media (prefers-color-scheme: dark) {
  .footer__theme-icon--sun { display: block; }
  .footer__theme-icon--moon { display: none; }
}

/* Override icon visibility when data-theme is set */
html[data-theme="light"] .footer__theme-icon--sun { display: none; }
html[data-theme="light"] .footer__theme-icon--moon { display: block; }
html[data-theme="dark"] .footer__theme-icon--sun { display: block; }
html[data-theme="dark"] .footer__theme-icon--moon { display: none; }

/* ==========================================
   Utilities
   ========================================== */
.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;
}

/* ==========================================
   Button loading spinner
   ========================================== */
@keyframes spin {
  to { transform: rotate(360deg); }
}

.btn-loading {
  position: relative;
  color: transparent !important;
  pointer-events: none;
}

.btn-loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 1em;
  height: 1em;
  margin: -0.5em 0 0 -0.5em;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  /* Restore visibility for the spinner itself */
  color: var(--color-text-secondary);
}

/* Accent-colored spinner for primary buttons */
.day-panel__save-btn.btn-loading::after,
.day-panel__switch-link.btn-loading::after {
  color: var(--color-accent);
}

/* ==========================================
   Day panel inline error
   ========================================== */
.day-panel__error {
  margin: 0 0 var(--space-md);
  padding: var(--space-sm) var(--space-md);
  font-size: 0.8125rem;
  color: #dc2626;
  background: #fef2f2;
  border-radius: var(--radius-sm);
  opacity: 1;
  transition: opacity 0.3s ease;
}

.day-panel__error[hidden] {
  display: none;
}

.day-panel__error--fading {
  opacity: 0;
}

@media (prefers-color-scheme: dark) {
  .day-panel__error {
    background: rgba(220, 38, 38, 0.15);
    color: #fca5a5;
  }
}

html[data-theme="dark"] .day-panel__error {
  background: rgba(220, 38, 38, 0.15);
  color: #fca5a5;
}

html[data-theme="light"] .day-panel__error {
  background: #fef2f2;
  color: #dc2626;
}

/* ==========================================
   Time hint saving pulse
   ========================================== */
@keyframes pulse-opacity {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.day-panel__time-hint--saving {
  animation: pulse-opacity 1.2s ease-in-out infinite;
}

/* ==========================================
   Buttons (generic)
   ========================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-2xl);
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.btn:hover {
  text-decoration: none;
}

.btn:active {
  transform: scale(0.98);
}

.btn--primary {
  color: white;
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-hover) 100%);
  box-shadow: 0 4px 14px -3px rgba(29, 78, 216, 0.4);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px -3px rgba(29, 78, 216, 0.5);
}

/* ==========================================
   Action Card Component (shared)
   Base class for calendar-card and settings-section
   ========================================== */
.action-card {
  padding: var(--space-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.action-card__header {
  margin-bottom: var(--space-md);
}

.action-card__title {
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 var(--space-xs);
}

.action-card__description {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin: 0;
}

.action-card__body {
  margin-top: var(--space-md);
}

.action-card__actions {
  margin-top: var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.action-card__save-btn {
  padding: var(--space-sm) var(--space-lg);
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 500;
  background: var(--color-accent);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.15s ease;
}

.action-card__save-btn:hover {
  background: var(--color-accent-hover);
}

.action-card__save-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.action-card__feedback {
  font-size: 0.875rem;
  color: var(--color-success);
  opacity: 0;
  transition: opacity 0.2s ease;
}

.action-card__feedback--visible {
  opacity: 1;
}

/* ==========================================
   Modal Overlay (shared)
   ========================================== */
.modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  touch-action: none;
}

/* ==========================================
   Feed URL Component (shared)
   ========================================== */
.feed-url {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

/* ==========================================
   Email Dialog (shared across pages)
   ========================================== */
.email-dialog {
  position: fixed;
  inset: 0;
  z-index: 200;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s ease;
}

.email-dialog--open {
  pointer-events: auto;
  opacity: 1;
}

.email-dialog__overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  touch-action: none;
}

.email-dialog__content {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  max-height: 70vh;
  max-height: 70svh;
  background: var(--color-surface);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  transform: translateY(100%);
  transition: transform 0.25s ease;
  overflow-y: auto;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
}

.email-dialog--open .email-dialog__content {
  transform: translateY(0);
}

/* Desktop: centered modal instead of bottom sheet */
@media (min-width: 768px) {
  .email-dialog__content {
    position: absolute;
    bottom: auto;
    top: 50%;
    left: 50%;
    right: auto;
    transform: translate(-50%, -50%) scale(0.95);
    max-width: 24rem;
    width: 90%;
    max-height: 80vh;
    max-height: 80svh;
    border-radius: var(--radius-lg);
  }

  .email-dialog--open .email-dialog__content {
    transform: translate(-50%, -50%) scale(1);
  }
}

.email-dialog__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg);
  border-bottom: 1px solid var(--color-border);
}

.email-dialog__title {
  font-size: 1.125rem;
  font-weight: 600;
  margin: 0;
}

.email-dialog__close {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  margin-right: calc(-1 * var(--space-sm));
}

.email-dialog__close:hover {
  background: var(--color-surface-raised);
}

.email-dialog__body {
  padding: var(--space-lg);
}

.email-dialog__description {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
  font-size: 0.9375rem;
}

.email-dialog__form {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.email-dialog__input {
  width: 100%;
  padding: var(--space-md) var(--space-lg);
  font-family: inherit;
  font-size: 1rem;
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.email-dialog__input::placeholder {
  color: var(--color-text-secondary);
}

.email-dialog__input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-subtle);
  outline: none;
}

.email-dialog__input--invalid {
  border-color: #dc2626;
}

.email-dialog__input--invalid:focus {
  box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.15);
}

.email-dialog__error {
  font-size: 0.8125rem;
  color: #dc2626;
  min-height: 1.25rem;
  margin: 0;
}

.email-dialog__actions {
  display: flex;
  gap: var(--space-sm);
  justify-content: flex-end;
  margin-top: var(--space-sm);
}

.email-dialog__cancel {
  padding: var(--space-sm) var(--space-lg);
  font-family: inherit;
  font-size: 0.9375rem;
  font-weight: 500;
  background: none;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.email-dialog__cancel:hover {
  background: var(--color-surface-raised);
}

.email-dialog__submit {
  padding: var(--space-sm) var(--space-lg);
  font-family: inherit;
  font-size: 0.9375rem;
  font-weight: 500;
  background: var(--color-accent);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.email-dialog__submit:hover {
  background: var(--color-accent-hover);
}

.email-dialog__submit:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.email-dialog__note {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  text-align: center;
  margin-top: var(--space-lg);
  margin-bottom: 0;
}


.feed-url__input-wrapper {
  position: relative;
  flex: 1;
  min-width: 0;
}

.feed-url__input {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  padding-right: 36px;
  font-family: 'Monaco', 'Menlo', 'Consolas', monospace;
  font-size: 0.8125rem;
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  user-select: all;
}

.feed-url__input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-subtle);
}

.feed-url__toggle {
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  padding: var(--space-xs);
  cursor: pointer;
  color: var(--color-text-secondary);
  transition: color 0.15s ease;
}

.feed-url__toggle:hover {
  color: var(--color-text);
}

/* Show/hide eye icons based on state */
.feed-url__toggle .feed-url__icon-hide { display: none; }
.feed-url__toggle--revealed .feed-url__icon-show { display: none; }
.feed-url__toggle--revealed .feed-url__icon-hide { display: block; }

.feed-url__actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.feed-url__copy {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 500;
  background: var(--color-accent);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.15s ease;
  white-space: nowrap;
}

.feed-url__copy:hover {
  background: var(--color-accent-hover);
}

.feed-url__copy svg {
  flex-shrink: 0;
}

.feed-url__open {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-sm) var(--space-md);
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 500;
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
  text-decoration: none;
}

.feed-url__open:hover {
  border-color: var(--color-border-strong);
  background: var(--color-surface-raised);
  text-decoration: none;
}

.feed-url__hint {
  margin-top: var(--space-xs);
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  line-height: 1.4;
}