/* ========================================
   Base Styles - Shared across all pages
   Import tokens.css before this file
======================================== */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

/* ====== Body ====== */
body {
  font-family: var(--font-mono);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  font-weight: 400;
  min-height: 100vh;
  overflow-x: hidden;
  transition: background 0.4s ease, color 0.4s ease;
}

/* Animated gradient background */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background: var(--gradient-bg);
  background-size: 400% 400%;
  animation: gradientShift 15s ease infinite;
  pointer-events: none;
  z-index: -2;
}

@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* ====== Selection ====== */
::selection {
  background: var(--color-accent-glow);
  color: var(--color-text);
}

/* ====== Scrollbar ====== */
::-webkit-scrollbar {
  width: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-border-hover);
}

/* ====== Links ====== */
a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* ========================================
   Navigation
======================================== */

/* Fixed header navigation */
.social-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: var(--space-lg) var(--space-xl);
  display: flex;
  justify-content: flex-end;
  pointer-events: none;
}

.social-header.has-back {
  justify-content: space-between;
}

@media (max-width: 768px) {
  .social-header {
    padding: 12px 16px;
  }

  .social-header.scrolled {
    background: color-mix(in srgb, var(--color-bg) 85%, transparent);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    padding: 10px 16px;
  }
}

/* Back link */
.back-link {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  padding: 8px 16px;
  border-radius: var(--radius-full);
  background: transparent;
  border: none;
  transition: all var(--transition-normal);
  pointer-events: auto;
}

.back-link svg {
  width: 16px;
  height: 16px;
  transition: transform var(--transition-normal);
}

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

.back-link:hover svg {
  transform: translateX(-3px);
}

/* Social icons */
.social-icons {
  display: flex;
  gap: var(--space-sm);
  pointer-events: auto;
}

.social-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  color: var(--color-text-muted);
  transition: color var(--transition-normal);
}

.social-icon svg {
  width: 18px;
  height: 18px;
}

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

/* ========================================
   Layout
======================================== */
.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 120px var(--space-lg) var(--space-4xl);
}

.container--wide {
  max-width: 1200px;
}

.container--narrow {
  max-width: 640px;
}

section {
  margin-bottom: var(--space-4xl);
}

/* ========================================
   Typography
======================================== */
h1, .h1, .title {
  font-family: var(--font-title);
  font-size: clamp(2.5rem, 8vw, 4rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: var(--space-md);
}

h2, .h2, .section-title {
  font-family: var(--font-title);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--space-lg);
  color: var(--color-accent);
}

h3, .h3 {
  font-family: var(--font-title);
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.intro {
  font-family: var(--font-body);
  font-size: 1.15rem;
  line-height: 1.8;
  color: var(--color-text-muted);
  max-width: 540px;
  margin-top: var(--space-lg);
}

.text-muted { color: var(--color-text-muted); }
.text-dim { color: var(--color-text-dim); }
.text-accent { color: var(--color-accent); }

/* ========================================
   Cards
======================================== */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: all var(--transition-normal);
}

.card:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-border-hover);
}

.card--interactive {
  cursor: pointer;
}

.card--interactive:hover {
  transform: translateY(-4px);
}

/* ========================================
   Buttons
======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 12px 24px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
  transition: all var(--transition-normal);
}

.btn:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-border-hover);
  transform: translateY(-2px);
}

.btn--primary {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-bg);
}

.btn--primary:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
}

/* ========================================
   Tags & Labels
======================================== */
.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: var(--radius-full);
  background: var(--color-surface-hover);
  color: var(--color-text-muted);
}

.label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
}

/* ========================================
   Form Elements
======================================== */
.form-input,
.input {
  width: 100%;
  padding: var(--space-md) var(--space-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 1rem;
  transition: all var(--transition-normal);
}

.form-input::placeholder,
.input::placeholder {
  color: var(--color-text-dim);
}

.form-input:focus,
.input:focus {
  outline: none;
  border-color: var(--color-accent);
  background: var(--color-surface-hover);
}

textarea.form-input,
textarea.input {
  resize: vertical;
  min-height: 120px;
}

/* ========================================
   Dividers
======================================== */
.divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-border-hover), transparent);
  margin: var(--space-4xl) 0;
}

/* ========================================
   Images
======================================== */
.img-rounded {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

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

/* ========================================
   Animations
======================================== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* Animation reveal state */
[data-animate] {
  opacity: 0;
  filter: blur(8px);
}

[data-animate].revealed {
  opacity: 1 !important;
  filter: blur(0) !important;
}

/* ========================================
   Utilities
======================================== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }

/* ========================================
   Responsive
======================================== */
@media (max-width: 640px) {
  .container {
    padding: 56px var(--space-md) var(--space-3xl);
  }

  section {
    margin-bottom: var(--space-2xl);
  }

  h1, .h1, .title {
    font-size: 2rem;
  }

  .intro {
    font-size: 1rem;
  }
}