/* ==========================================================================
   style.css — Global Styles
   Contains: CSS reset, custom properties (CSS variables), theme definitions,
   global typography, body styles, transitions, glass card utility, 
   scroll-to-top button, and responsive layout rules.
   ========================================================================== */

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

ul, ol {
  list-style: none;
}

a {
  text-decoration: none;
  color: inherit;
}

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

button {
  font-family: inherit;
  cursor: pointer;
}

/* ── CSS Custom Properties (Design Tokens) ── */
:root {
  /* Brand colors */
  --amber: #E5A00D;
  --amber-glow: rgba(229, 160, 13, 0.15);
  --amber-border: #C9922A;

  /* Timing */
  --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);

  /* Typography */
  --font: 'Space Grotesk', sans-serif;

  /* Spacing & Layout */
  --radius: 16px;
  --nav-h: 56px;
}

/* ── Dark Theme (Default) ── */
[data-theme="dark"] {
  --bg: #0B1120;
  --bg2: #111827;
  --card-bg: rgba(255, 255, 255, 0.04);
  --card-border: rgba(255, 255, 255, 0.08);
  --text: #F1F5F9;
  --text2: #94A3B8;
  --glass: rgba(255, 255, 255, 0.06);
  --glass-border: rgba(255, 255, 255, 0.1);
}

/* ── Light Theme ── */
[data-theme="light"] {
  --bg: #FAFAFA;
  --bg2: #FFFFFF;
  --card-bg: rgba(0, 0, 0, 0.02);
  --card-border: rgba(0, 0, 0, 0.06);
  --text: #1E293B;
  --text2: #64748B;
  --glass: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(0, 0, 0, 0.08);
}

/* ── Global Body ── */
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  transition: background var(--transition), color var(--transition);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* ── Global Typography ── */
h1 {
  font-size: clamp(2.2rem, 6vw, 3.2rem);
  font-weight: 700;
  letter-spacing: -1.5px;
  line-height: 1.1;
}

h2 {
  font-size: 1.4rem;
  font-weight: 600;
  letter-spacing: -0.5px;
}

/* Section label used across all sections */
.section-label {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--amber);
  margin-bottom: 1.5rem;
}

/* ── Main Content Container ── */
main {
  max-width: 760px;
  margin: 0 auto;
  padding: calc(var(--nav-h) + 2rem) 1.5rem 6rem;
}

section {
  margin-bottom: 5rem;
}

/* ── Glass Card Utility ── 
   Reusable glassmorphism card style applied via .glass class */
.glass {
  background: var(--glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: all var(--transition);
}

.glass:hover {
  border-color: rgba(229, 160, 13, 0.25);
  box-shadow: 0 0 30px var(--amber-glow);
}

/* ── Button Styles ── */
.btn-primary {
  background: var(--amber);
  color: #0B1120;
}

.btn-primary:hover {
  box-shadow: 0 4px 20px rgba(229, 160, 13, 0.35);
  transform: translateY(-1px);
}

.btn-secondary {
  border: 1px solid var(--glass-border);
  color: var(--text);
}

.btn-secondary:hover {
  border-color: var(--amber);
  color: var(--amber);
}

/* ── Theme Toggle Button ── */
.theme-btn {
  background: none;
  border: 1px solid var(--glass-border);
  color: var(--text);
  cursor: pointer;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  font-size: 1rem;
}

.theme-btn:hover {
  border-color: var(--amber);
  color: var(--amber);
}

/* ── Badge Utility ── */
.badge {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: 0.2rem 0.6rem;
  border-radius: 6px;
  border: 1px solid var(--amber);
  color: var(--amber);
  opacity: 0.7;
}

/* ── Scroll-to-Top Button ── */
.scroll-top-btn {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: var(--amber);
  color: #0B1120;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  z-index: 99;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity var(--transition), visibility var(--transition), transform var(--transition), box-shadow var(--transition);
  box-shadow: 0 4px 15px rgba(229, 160, 13, 0.3);
}

.scroll-top-btn.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.scroll-top-btn:hover {
  box-shadow: 0 6px 25px rgba(229, 160, 13, 0.5);
  transform: translateY(-2px);
}

/* ── Fade-Up Animation Utility ──
   Used by animations.js — elements start invisible and slide up on scroll */
.fade-up {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ── Responsive Breakpoints ── */
@media (max-width: 768px) {
  main {
    padding-bottom: calc(var(--nav-h) + 3rem);
  }

  html {
    scroll-padding-top: 64px;
  }

  /* Move scroll-to-top above the mobile bottom nav */
  .scroll-top-btn {
    bottom: calc(var(--nav-h) + 1rem);
  }
}