/* ============================================
   SOST — Sea Our Style Travel
   Design tokens & base stylesheet
   ============================================ */

:root {
  /* Type scale */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 5rem);

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.875rem;
  --radius-full: 999px;

  /* Fonts */
  --font-display: 'Instrument Serif', 'Iowan Old Style', Georgia, serif;
  --font-body: 'Switzer', ui-sans-serif, system-ui, sans-serif;

  /* Layout */
  --wrap: 1200px;
  --wrap-narrow: 760px;
  --gutter: clamp(1.25rem, 5vw, 4rem);

  /* Easing */
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ---------- Light theme (default) ---------- */
:root,
[data-theme='light'] {
  --navy: #0b3b5c;
  --navy-deep: #07293f;
  --teal: #3fa8b8;
  --teal-deep: #1d7f8f;
  --coral: #d97757;

  --color-bg: #fbfaf7;
  --color-surface: #ffffff;
  --color-surface-2: #f4f1ec;
  --color-surface-3: #ece7e0;
  --color-border: #ddd6cc;
  --color-divider: #e8e2d9;

  --color-text: #12283a;
  --color-text-muted: #5c6b78;
  --color-text-faint: #8b98a3;
  --color-text-inverse: #fbfaf7;

  --color-heading: var(--navy);
  --color-accent: var(--teal-deep);
  --color-accent-soft: #e4f1f3;

  --shadow-sm: 0 1px 2px rgba(11, 59, 92, 0.06), 0 2px 8px rgba(11, 59, 92, 0.05);
  --shadow-md: 0 4px 12px rgba(11, 59, 92, 0.08), 0 12px 32px rgba(11, 59, 92, 0.07);
  --shadow-lg: 0 8px 24px rgba(11, 59, 92, 0.1), 0 24px 64px rgba(11, 59, 92, 0.1);

  --logo-ink: var(--navy);
  --logo-wave: var(--teal);
}

/* ---------- Dark theme ---------- */
[data-theme='dark'] {
  --navy: #0b3b5c;
  --navy-deep: #051c2c;
  --teal: #4fbccd;
  --teal-deep: #6fd0de;
  --coral: #e89272;

  --color-bg: #08202f;
  --color-surface: #0d2c40;
  --color-surface-2: #123549;
  --color-surface-3: #1a4159;
  --color-border: #27546e;
  --color-divider: #1d4159;

  --color-text: #e8f1f5;
  --color-text-muted: #a3bcc9;
  --color-text-faint: #718c9c;
  --color-text-inverse: #08202f;

  --color-heading: #f2f8fa;
  --color-accent: #6fd0de;
  --color-accent-soft: #15384c;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3), 0 2px 8px rgba(0, 0, 0, 0.24);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.32), 0 12px 32px rgba(0, 0, 0, 0.28);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.36), 0 24px 64px rgba(0, 0, 0, 0.36);

  --logo-ink: #f2f8fa;
  --logo-wave: #6fd0de;
}

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

* {
  margin: 0;
}

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

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

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  transition:
    background-color 0.4s var(--ease),
    color 0.4s var(--ease);
}

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

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  font-weight: 400;
  color: var(--color-heading);
  line-height: 1.08;
  letter-spacing: -0.015em;
  text-wrap: balance;
}

p {
  text-wrap: pretty;
}

a {
  color: var(--color-accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

::selection {
  background: var(--color-accent);
  color: var(--color-text-inverse);
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* ---------- Layout primitives ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.wrap-narrow {
  width: 100%;
  max-width: var(--wrap-narrow);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

section {
  padding-block: clamp(var(--space-16), 9vw, var(--space-32));
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 200;
  padding: var(--space-3) var(--space-5);
  background: var(--navy);
  color: #fff;
  border-radius: 0 0 var(--radius-md) 0;
}
.skip-link:focus {
  left: 0;
}

/* ---------- Eyebrow / section label ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-5);
}

.eyebrow::before {
  content: '';
  width: 28px;
  height: 1px;
  background: currentColor;
  opacity: 0.6;
}

.lede {
  font-size: var(--text-lg);
  line-height: 1.5;
  color: var(--color-text-muted);
  max-width: 58ch;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.01em;
  border: 1px solid transparent;
  border-radius: var(--radius-full);
  cursor: pointer;
  text-decoration: none;
  transition:
    transform 0.25s var(--ease),
    background-color 0.25s var(--ease),
    border-color 0.25s var(--ease),
    color 0.25s var(--ease),
    box-shadow 0.25s var(--ease);
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: var(--navy);
  color: #fff;
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover {
  background: var(--navy-deep);
  box-shadow: var(--shadow-md);
}
[data-theme='dark'] .btn-primary {
  background: var(--color-accent);
  color: var(--navy-deep);
}
[data-theme='dark'] .btn-primary:hover {
  background: #8bdce8;
}

.btn-ghost {
  background: transparent;
  color: var(--color-heading);
  border-color: var(--color-border);
}
.btn-ghost:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn-light {
  background: rgba(255, 255, 255, 0.95);
  color: var(--navy);
  backdrop-filter: blur(8px);
}
.btn-light:hover {
  background: #fff;
}

.btn-outline-light {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.55);
  backdrop-filter: blur(8px);
}
.btn-outline-light:hover {
  background: rgba(255, 255, 255, 0.18);
  border-color: #fff;
}

/* ---------- Reveal on scroll ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity 0.8s var(--ease),
    transform 0.8s var(--ease);
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
  }
}