/* /css/base.css */

/* =============================================
   VARIABLES & RESET
   ============================================= */
:root {
  --hue: 250;
  --bg-color: oklch(16% 0.015 var(--hue));
  --bg-secondary: oklch(21% 0.02 var(--hue));
  --text-color: oklch(96% 0.01 var(--hue));
  --text-muted: oklch(75% 0.02 var(--hue));
  --primary-color: oklch(88% 0.04 var(--hue));
  --primary-hover: oklch(78% 0.04 var(--hue));
  --text-on-primary: oklch(12% 0.015 var(--hue));
  --primary-light: oklch(30% 0.03 var(--hue));
  --border-color: oklch(32% 0.02 var(--hue));
  --card-bg: oklch(19% 0.02 var(--hue));
  --footer-bg: oklch(12% 0.015 var(--hue));

  --font-heading: 'Syne', sans-serif;
  --font-body: 'Inter', sans-serif;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  --success-color: oklch(65% 0.18 140);
  --error-color: oklch(62% 0.22 25);
  --shadow-color: oklch(0% 0 0 / 0.3);
  --shadow-sm: 0 1px 3px var(--shadow-color);
  --shadow-md: 0 4px 16px var(--shadow-color);

  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);

  /* Spacing Tokens (P1) */
  --space-xs: 0.5rem;   /* 8px */
  --space-sm: 1rem;     /* 16px */
  --space-md: 1.5rem;   /* 24px */
  --space-lg: 3rem;     /* 48px */
  --space-xl: 6rem;     /* 96px */

  /* Typography Scale Tokens (P1) */
  --fs-display: clamp(2.5rem, 6vw, 5rem);
  --fs-headline: clamp(1.75rem, 4vw, 2.5rem);
  --fs-title: 1.5rem;
  --fs-body: 1rem;
  --fs-muted: 0.95rem;
  --fs-small: 0.85rem;
  --fs-xs: 0.75rem;
  --navbar-height: 64px;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--navbar-height) + 1.5rem);
}

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

body {
  font-family: var(--font-body);
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  overflow-x: hidden;
}

/* Global keyboard focus indicators for accessibility (P2) */
a:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 4px;
  border-radius: var(--radius-sm);
}

::selection {
  background: var(--primary-color);
  color: var(--text-on-primary);
}

/* =============================================
   TYPOGRAPHY
   ============================================= */
h1,
h2,
h3,
h4 {
  font-family: var(--font-heading);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

p {
  max-width: 65ch;
}

/* =============================================
   UTILITIES
   ============================================= */
.text-accent {
  color: var(--primary-color);
}

.section-inner {
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

@media (min-width: 768px) {
  .section-inner {
    padding-left: 2rem;
    padding-right: 2rem;
  }
}

.section-title {
  font-size: var(--fs-headline);
  text-align: center;
  margin-bottom: var(--space-lg);
}

/* =============================================
   ANIMATIONS
   ============================================= */
.animate-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.5s var(--ease-out-expo), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

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

.animate-fade {
  opacity: 0;
  transition: opacity 1s ease;
}

.animate-fade.visible {
  opacity: 1;
}

.delay-1 {
  transition-delay: 0.1s;
}

.delay-2 {
  transition-delay: 0.2s;
}

.delay-3 {
  transition-delay: 0.35s;
}