/* ============================================
   DESIGN TOKENS — Portfolio Isshia
   ============================================ */

:root {
  /* Colors */
  --color-bg: #0a0a0a;
  --color-surface: #141414;
  --color-card: #1a1a2e;
  --color-primary: #4361ee;
  --color-secondary: #00b4d8;
  --color-accent: #7209b7;
  --color-text: #ffffff;
  --color-text-secondary: #a0a0b0;
  --color-text-muted: #6b6b7b;
  --color-success: #2ecc71;
  --color-warning: #f39c12;
  --color-error: #e74c3c;
  --color-border: rgba(255, 255, 255, 0.08);

  /* Typography */
  --font-heading: 'Inter', system-ui, -apple-system, sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Font Sizes */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-md: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 2rem;
  --text-4xl: 2.5rem;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-card-hover: 0 4px 20px rgba(67, 97, 238, 0.15);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;

  /* Layout */
  --max-width: 1200px;
  --nav-height: 64px;
}

/* ============================================
   RESET
   ============================================ */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-md);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  line-height: 1.2;
  font-weight: 700;
}

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

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

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;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

/* ============================================
   UTILITIES
   ============================================ */

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.section {
  padding: var(--space-4xl) 0;
}

.section--alt {
  background-color: var(--color-surface);
}

/* Flex */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-xs { gap: var(--space-xs); }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }
.gap-xl { gap: var(--space-xl); }

/* Grid */
.grid { display: grid; gap: var(--space-lg); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* Text */
.text-center { text-align: center; }
.text-secondary { color: var(--color-text-secondary); }
.text-muted { color: var(--color-text-muted); }
.text-primary { color: var(--color-primary); }
.text-cyan { color: var(--color-secondary); }

/* ============================================
   COMPONENTS — Buttons
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-sm) var(--space-xl);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: var(--text-md);
  transition: all var(--transition-base);
  white-space: nowrap;
}

.btn--primary {
  background-color: var(--color-primary);
  color: var(--color-text);
}

.btn--primary:hover {
  background-color: var(--color-secondary);
  transform: translateY(-1px);
}

.btn--outline {
  background-color: transparent;
  color: var(--color-text);
  border: 2px solid var(--color-text);
}

.btn--outline:hover {
  background-color: var(--color-text);
  color: var(--color-bg);
}

.btn--full {
  width: 100%;
}

/* ============================================
   COMPONENTS — Badges
   ============================================ */

.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 500;
  border: 1px solid var(--color-border);
  background: rgba(255, 255, 255, 0.05);
  color: var(--color-text-secondary);
}

.badge--tech {
  border-color: var(--color-secondary);
  color: var(--color-secondary);
  background: rgba(0, 180, 216, 0.1);
}

.badge--store {
  border-color: var(--color-success);
  color: var(--color-success);
  background: rgba(46, 204, 113, 0.1);
  font-size: var(--text-xs);
}

.badge--store-pending {
  border-color: var(--color-warning);
  color: var(--color-warning);
  background: rgba(243, 156, 18, 0.1);
}

.badge--store-dev {
  border-color: var(--color-text-muted);
  color: var(--color-text-muted);
  background: rgba(107, 107, 123, 0.1);
}

.badge--level-advanced {
  border-color: var(--color-secondary);
  color: var(--color-secondary);
}

.badge--level-intermediate {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.badge--level-beginner {
  border-color: var(--color-text-muted);
  color: var(--color-text-muted);
}

/* ============================================
   COMPONENTS — Cards
   ============================================ */

.card {
  background-color: var(--color-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  overflow: hidden;
  transition: all var(--transition-base);
}

.card:hover {
  border-color: rgba(0, 180, 216, 0.3);
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

.card__image {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background-color: var(--color-surface);
}

.card__content {
  padding: var(--space-md);
}

.card__title {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

.card__description {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-bottom: var(--space-sm);
}

/* ============================================
   COMPONENTS — Section Headers
   ============================================ */

.section__title {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-md);
}

.section__subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2xl);
}

.section__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  color: var(--color-secondary);
  font-weight: 500;
  margin-top: var(--space-xl);
  transition: gap var(--transition-fast);
}

.section__link:hover {
  gap: var(--space-sm);
}

/* ============================================
   COMPONENTS — CTA Section
   ============================================ */

.cta-section {
  padding: var(--space-3xl) 0;
  text-align: center;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  border-radius: var(--radius-xl);
  margin: var(--space-2xl) 0;
}

.cta-section__title {
  font-size: var(--text-xl);
  font-weight: 600;
  margin-bottom: var(--space-lg);
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  :root {
    --text-3xl: 1.75rem;
    --text-4xl: 2rem;
    --space-4xl: 4rem;
  }

  .container {
    padding: 0 var(--space-md);
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .section {
    padding: var(--space-3xl) 0;
  }
}

/* ============================================
   ANIMATIONS
   ============================================ */

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

.animate-in {
  opacity: 0;
  animation: fadeInUp var(--transition-slow) forwards;
}

.animate-delay-1 { animation-delay: 100ms; }
.animate-delay-2 { animation-delay: 200ms; }
.animate-delay-3 { animation-delay: 300ms; }

/* ============================================
   NAV
   ============================================ */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(10, 10, 10, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  display: flex;
  align-items: center;
}

.nav__inner {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav__links {
  display: flex;
  gap: var(--space-xl);
}

.nav__link {
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  font-weight: 500;
  text-decoration: none;
  transition: color var(--transition-fast);
  position: relative;
}

.nav__link:hover,
.nav__link--active {
  color: var(--color-secondary);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-secondary);
  transform: scaleX(0);
  transition: transform var(--transition-fast);
}

.nav__link:hover::after,
.nav__link--active::after {
  transform: scaleX(1);
}

.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: var(--space-sm);
}

.nav__hamburger span {
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: all var(--transition-fast);
}

.nav__hamburger--open span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav__hamburger--open span:nth-child(2) {
  opacity: 0;
}

.nav__hamburger--open span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

@media (max-width: 768px) {
  .nav__links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(10, 10, 10, 0.98);
    flex-direction: column;
    align-items: center;
    padding: var(--space-lg);
    gap: var(--space-lg);
    border-bottom: 1px solid var(--color-border);
  }

  .nav__links--open {
    display: flex;
  }

  .nav__hamburger {
    display: flex;
  }

  .nav__inner {
    justify-content: flex-end;
  }
}

/* ============================================
   FOOTER
   ============================================ */

.footer {
  padding: var(--space-2xl) 0;
  border-top: 1px solid var(--color-border);
  background-color: var(--color-bg);
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.footer__social {
  display: flex;
  gap: var(--space-lg);
}

.footer__social-link {
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  font-weight: 500;
  transition: color var(--transition-fast);
  text-decoration: none;
}

.footer__social-link:hover {
  color: var(--color-secondary);
}

.footer__copyright {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

@media (max-width: 768px) {
  .footer__inner {
    flex-direction: column;
    text-align: center;
  }
}

/* ============================================
   BUTTONS — Link fix
   ============================================ */

a.btn {
  text-decoration: none;
  color: var(--color-text);
}

a.btn:hover {
  color: var(--color-text);
}

a.btn--outline {
  color: var(--color-text);
}

a.btn--outline:hover {
  color: var(--color-bg);
}

/* ============================================
   PAGE HEADER (shared)
   ============================================ */

.page-header {
  padding-top: calc(var(--nav-height) + var(--space-3xl));
  padding-bottom: var(--space-2xl);
}

.page-header__title {
  font-size: var(--text-3xl);
  margin-bottom: var(--space-sm);
}

.page-header__subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  max-width: 600px;
}