/* ═══════════════════════════════════════════════
   FLOW FREEDIVING — Base Styles
   Reset · Typography · Utilities
   ═══════════════════════════════════════════════ */

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-primary);
  font-size: var(--fs-body);
  font-weight: var(--fw-regular);
  line-height: var(--lh-normal);
  color: var(--text-primary);
  background-color: var(--deep-navy);
  overflow-x: hidden;
  min-height: 100vh;
}

body.no-scroll {
  overflow: hidden;
}

/* ── Typography ── */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: var(--fw-bold);
  line-height: var(--lh-tight);
  letter-spacing: var(--ls-tight);
  color: var(--text-primary);
}

h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }
h4 { font-size: var(--fs-h4); }

p {
  color: var(--text-secondary);
  line-height: var(--lh-relaxed);
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--accent);
}

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

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
  outline: none;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
  border: none;
  outline: none;
  background: none;
  color: inherit;
}

/* ── Layout ── */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--section-px);
}

.container--narrow {
  max-width: var(--container-narrow);
}

section {
  position: relative;
}

.section-padding {
  padding: var(--section-py) 0;
}

/* ── Section Titles ── */
.section-label {
  display: inline-block;
  font-size: var(--fs-small);
  font-weight: var(--fw-semibold);
  letter-spacing: var(--ls-wider);
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-4);
}

.section-title {
  font-size: var(--fs-h2);
  font-weight: var(--fw-extrabold);
  letter-spacing: var(--ls-wider);
  text-transform: uppercase;
  color: var(--text-primary);
  margin-bottom: var(--space-5);
}

.section-subtitle {
  font-size: var(--fs-body);
  font-weight: var(--fw-light);
  color: var(--text-secondary);
  max-width: 500px;
  margin: 0 auto var(--space-16);
  line-height: var(--lh-relaxed);
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-16);
}

/* ── Selection ── */
::selection {
  background: var(--accent);
  color: var(--white);
}

/* ── Scrollbar ── */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--light-bg);
}

::-webkit-scrollbar-thumb {
  background: var(--ocean-blue);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--sky-blue);
}

/* ── Focus Visible ── */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ── Screen Reader Only ── */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ── Animation Base ── */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--duration-slower) var(--ease-out),
              transform var(--duration-slower) var(--ease-out);
}

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

.fade-in {
  opacity: 0;
  transition: opacity var(--duration-slower) var(--ease-out);
}

.fade-in.is-visible {
  opacity: 1;
}

/* Stagger children */
.stagger > .fade-up:nth-child(1) { transition-delay: 0s; }
.stagger > .fade-up:nth-child(2) { transition-delay: 0.1s; }
.stagger > .fade-up:nth-child(3) { transition-delay: 0.2s; }
.stagger > .fade-up:nth-child(4) { transition-delay: 0.3s; }
.stagger > .fade-up:nth-child(5) { transition-delay: 0.4s; }
.stagger > .fade-up:nth-child(6) { transition-delay: 0.5s; }

/* ── Utility ── */
.hidden { display: none !important; }
.text-center { text-align: center; }
.text-accent { color: var(--accent); }