/* =========================================================
   THEME.CSS — Shared dark design system foundation
   Loaded on every page before page-specific styles
   ========================================================= */

/* ---------------------------------------------------------
   1. CSS Custom Properties
   --------------------------------------------------------- */
:root {
  /* Backgrounds */
  --color-bg:        #0a0a0f;
  --color-surface:   #111118;
  --color-surface-2: #1a1a26;
  --color-border:    #2a2a3d;

  /* Accents */
  --color-accent-1:    #7c3aed;
  --color-accent-2:    #06b6d4;
  --color-accent-glow: rgba(124, 58, 237, 0.25);

  /* Text */
  --color-text-primary:   #f0f0f8;
  --color-text-secondary: #9898b8;
  --color-text-muted:     #55556a;

  /* Skill / tag tokens */
  --color-tag-bg:     rgba(124, 58, 237, 0.12);
  --color-tag-border: rgba(124, 58, 237, 0.35);

  /* Typography */
  --font-display: 'Inter', sans-serif;
  --font-mono:    'JetBrains Mono', monospace;

  /* Type scale */
  --text-hero:  clamp(3rem, 8vw, 6rem);
  --text-h2:    clamp(1.75rem, 4vw, 2.5rem);
  --text-h3:    1.25rem;
  --text-body:  1rem;
  --text-small: 0.875rem;
  --text-tag:   0.75rem;
}

/* ---------------------------------------------------------
   2. Global Reset & Base
   --------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  font-family: var(--font-display);
  min-height: 100vh;
  padding-top: 56px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

ul {
  list-style: none;
}

/* ---------------------------------------------------------
   3. Custom Scrollbar (webkit)
   --------------------------------------------------------- */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: var(--color-bg);
}
::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-accent-1);
}

/* ---------------------------------------------------------
   4. Keyframes
   --------------------------------------------------------- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scrollBounce {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(6px); }
}

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

.animate-fade-up {
  animation: fadeInUp 0.7s ease forwards;
}

/* ---------------------------------------------------------
   5. Section Typography Utilities
   --------------------------------------------------------- */
.section-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-accent-2);
  margin-bottom: 0.75rem;
}

.section-heading {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-h2);
  color: var(--color-text-primary);
  letter-spacing: -0.01em;
  margin-bottom: 3rem;
}

/* ---------------------------------------------------------
   6. Skill Tags
   --------------------------------------------------------- */
.skill-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-secondary);
  background: var(--color-tag-bg);
  border: 1px solid var(--color-tag-border);
  padding: 0.3rem 0.75rem;
  border-radius: 4px;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.skill-tag:hover {
  color: var(--color-accent-1);
  border-color: var(--color-accent-1);
  background: rgba(124, 58, 237, 0.2);
}

/* ---------------------------------------------------------
   7. Project Cards
   --------------------------------------------------------- */
.project-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: border-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
  position: relative;
  overflow: hidden;
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent-1), var(--color-accent-2));
  opacity: 0;
  transition: opacity 0.3s ease;
}

.project-card:hover {
  border-color: var(--color-accent-1);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px var(--color-accent-glow);
}

.project-card:hover::before {
  opacity: 1;
}

.project-card__number {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--color-text-muted);
  letter-spacing: 0.1em;
}

.project-card__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent-2);
  background: rgba(6, 182, 212, 0.1);
  border: 1px solid rgba(6, 182, 212, 0.25);
  padding: 0.15rem 0.6rem;
  border-radius: 999px;
  width: fit-content;
}

.project-card__title {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin: 0;
}

.project-card__desc {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  flex: 1;
}

.project-card__footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: auto;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
}

.project-card__tech {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.project-card__link {
  color: var(--color-accent-1);
  text-decoration: none;
  font-size: 1.1rem;
  transition: transform 0.2s ease;
  display: inline-block;
}

.project-card__link:hover {
  transform: translate(2px, -2px);
}

/* ---------------------------------------------------------
   8. Lightbox
   --------------------------------------------------------- */
.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 999;
  background: rgba(0, 0, 0, 0.92);
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.lightbox.is-open {
  display: flex;
}

.lightbox.is-visible {
  opacity: 1;
}

.lightbox__content {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.lightbox__image {
  max-width: 90vw;
  max-height: 85vh;
  object-fit: contain;
  border-radius: 4px;
  box-shadow: 0 0 80px rgba(0, 0, 0, 0.8);
}

.lightbox__close {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  background: none;
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  font-size: 1.5rem;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

.lightbox__close:hover {
  color: var(--color-text-primary);
  border-color: var(--color-text-secondary);
}

.lightbox__prev,
.lightbox__next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  font-size: 1.25rem;
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox__prev { left: 1.5rem; }
.lightbox__next { right: 1.5rem; }

.lightbox__prev:hover,
.lightbox__next:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-text-primary);
}

.lightbox__caption {
  margin-top: 1rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  text-align: center;
}