/* ============================================
   Dan — Portfolio | Groupe NOVA
   Modern, responsive, dark/light theme
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
  /* 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;

  /* Typography */
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", monospace;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;

  /* Layout */
  --nav-height: 70px;
  --max-width: 1100px;
  --border-radius: 8px;
}

/* Dark theme (default) */
[data-theme="dark"] {
  --bg-primary: #0a0f1c;
  --bg-secondary: #111827;
  --bg-card: #1a2235;
  --bg-card-hover: #1f2a40;
  --bg-nav: rgba(10, 15, 28, 0.85);

  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --accent: #3b82f6;
  --accent-hover: #60a5fa;
  --accent-subtle: rgba(59, 130, 246, 0.1);
  --accent-glow: rgba(59, 130, 246, 0.15);

  --border: rgba(148, 163, 184, 0.1);
  --border-hover: rgba(148, 163, 184, 0.2);

  --code-bg: #0d1321;
  --code-keyword: #c084fc;
  --code-string: #34d399;
  --code-variable: #60a5fa;
  --code-property: #f472b6;
  --code-number: #fbbf24;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.4);

  --skill-bar-bg: rgba(59, 130, 246, 0.15);
  --trait-bg: rgba(59, 130, 246, 0.1);
  --trait-border: rgba(59, 130, 246, 0.3);
}

/* Light theme */
[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-card: #ffffff;
  --bg-card-hover: #f8fafc;
  --bg-nav: rgba(248, 250, 252, 0.85);

  --text-primary: #1e293b;
  --text-secondary: #475569;
  --text-muted: #94a3b8;

  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-subtle: rgba(37, 99, 235, 0.06);
  --accent-glow: rgba(37, 99, 235, 0.08);

  --border: rgba(15, 23, 42, 0.08);
  --border-hover: rgba(15, 23, 42, 0.15);

  --code-bg: #f1f5f9;
  --code-keyword: #7c3aed;
  --code-string: #059669;
  --code-variable: #2563eb;
  --code-property: #db2777;
  --code-number: #d97706;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.08);

  --skill-bar-bg: rgba(37, 99, 235, 0.1);
  --trait-bg: rgba(37, 99, 235, 0.06);
  --trait-border: rgba(37, 99, 235, 0.2);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-base),
              color var(--transition-base);
}

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

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

ul {
  list-style: none;
}

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

strong {
  color: var(--accent);
  font-weight: 600;
}

/* --- Utilities --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 1000;
  transition: transform var(--transition-base),
              background-color var(--transition-base),
              box-shadow var(--transition-base);
}

.nav--scrolled {
  background-color: var(--bg-nav);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
}

.nav--hidden {
  transform: translateY(-100%);
}

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

.nav__logo {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.nav__logo:hover {
  color: var(--text-primary);
}

.nav__logo-bracket {
  color: var(--accent);
}

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

.nav__link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: var(--space-xs) 0;
}

.nav__link::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--accent);
  transition: width var(--transition-base);
}

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

.nav__link:hover::after,
.nav__link--active::after {
  width: 100%;
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

/* Theme Toggle */
.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: color var(--transition-fast),
              border-color var(--transition-fast),
              background-color var(--transition-fast);
}

.theme-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
  background-color: var(--accent-subtle);
}

.theme-toggle__icon {
  width: 18px;
  height: 18px;
}

[data-theme="dark"] .theme-toggle__icon--sun { display: block; }
[data-theme="dark"] .theme-toggle__icon--moon { display: none; }
[data-theme="light"] .theme-toggle__icon--sun { display: none; }
[data-theme="light"] .theme-toggle__icon--moon { display: block; }

/* Hamburger */
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav__hamburger span {
  width: 24px;
  height: 2px;
  background-color: var(--text-primary);
  transition: transform var(--transition-base),
              opacity var(--transition-fast);
}

.nav__hamburger.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

.nav__hamburger.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.75rem 1.75rem;
  border-radius: var(--border-radius);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 2px solid transparent;
}

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

.btn--primary:hover {
  background-color: var(--accent-hover);
  border-color: var(--accent-hover);
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(59, 130, 246, 0.3);
}

.btn--outline {
  background-color: transparent;
  color: var(--accent);
  border-color: var(--accent);
}

.btn--outline:hover {
  background-color: var(--accent-subtle);
  color: var(--accent-hover);
  transform: translateY(-2px);
}

.btn--lg {
  padding: 1rem 2.5rem;
  font-size: 1rem;
}

/* --- Hero --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  padding: var(--nav-height) var(--space-lg) var(--space-3xl);
}

.hero__container {
  max-width: var(--max-width);
  margin: 0 auto;
  width: 100%;
}

.hero__greeting {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--accent);
  margin-bottom: var(--space-md);
}

.hero__name {
  font-size: clamp(2.5rem, 8vw, 5rem);
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.1;
  margin-bottom: var(--space-sm);
}

.hero__title {
  font-size: clamp(1.25rem, 4vw, 2.5rem);
  font-weight: 600;
  color: var(--text-secondary);
  line-height: 1.2;
  margin-bottom: var(--space-xl);
}

.hero__description {
  max-width: 540px;
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: var(--space-2xl);
}

.hero__cta {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

/* Hero animations */
.animate-in {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.6s ease forwards;
  animation-delay: var(--delay, 0s);
}

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

/* Scroll indicator */
.hero__scroll-indicator {
  position: absolute;
  bottom: var(--space-2xl);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  color: var(--text-muted);
  font-size: 0.75rem;
  font-family: var(--font-mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.hero__scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 1; transform: scaleY(1); }
  50% { opacity: 0.5; transform: scaleY(0.6); }
}

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

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

.section__title {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: var(--space-3xl);
  display: flex;
  align-items: center;
  gap: var(--space-md);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-slow),
              transform var(--transition-slow);
}

.section__title.visible {
  opacity: 1;
  transform: translateY(0);
}

.section__title::after {
  content: "";
  flex: 1;
  height: 1px;
  background-color: var(--border);
  max-width: 300px;
}

.section__number {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--accent);
  font-weight: 500;
}

/* --- About --- */
.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: start;
}

.about__text {
  opacity: 0;
  transform: translateX(-20px);
  transition: opacity var(--transition-slow),
              transform var(--transition-slow);
}

.about__text.visible {
  opacity: 1;
  transform: translateX(0);
}

.about__text p {
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
  font-size: 0.95rem;
}

.about__traits {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-xl);
}

.trait {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: var(--space-xs) var(--space-md);
  border-radius: 100px;
  background-color: var(--trait-bg);
  border: 1px solid var(--trait-border);
  color: var(--accent);
}

.about__visual {
  opacity: 0;
  transform: translateX(20px);
  transition: opacity var(--transition-slow),
              transform var(--transition-slow);
  transition-delay: 0.2s;
}

.about__visual.visible {
  opacity: 1;
  transform: translateX(0);
}

/* Code Card */
.about__card {
  background-color: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.about__card-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--border);
}

.about__card-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--text-muted);
  opacity: 0.4;
}

.about__card-dot:nth-child(1) { background-color: #ef4444; opacity: 0.8; }
.about__card-dot:nth-child(2) { background-color: #f59e0b; opacity: 0.8; }
.about__card-dot:nth-child(3) { background-color: #22c55e; opacity: 0.8; }

.about__card-filename {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-left: var(--space-sm);
}

.about__card-code {
  padding: var(--space-lg);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.8;
  overflow-x: auto;
}

.about__card-code code {
  color: var(--text-secondary);
}

.code-keyword { color: var(--code-keyword); }
.code-string { color: var(--code-string); }
.code-variable { color: var(--code-variable); }
.code-property { color: var(--code-property); }
.code-number { color: var(--code-number); }

/* --- Skills --- */
.skills__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-xl);
}

.skill-category {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--border-radius);
  padding: var(--space-xl);
  transition: transform var(--transition-base),
              box-shadow var(--transition-base),
              border-color var(--transition-fast),
              opacity var(--transition-slow);
  opacity: 0;
  transform: translateY(20px);
}

.skill-category.visible {
  opacity: 1;
  transform: translateY(0);
}

.skill-category:nth-child(2) { transition-delay: 0.1s; }
.skill-category:nth-child(3) { transition-delay: 0.2s; }
.skill-category:nth-child(4) { transition-delay: 0.3s; }

.skill-category:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-hover);
}

.skill-category__icon {
  width: 40px;
  height: 40px;
  color: var(--accent);
  margin-bottom: var(--space-lg);
}

.skill-category__icon svg {
  width: 100%;
  height: 100%;
}

.skill-category__title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: var(--space-lg);
}

.skill-category__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.skill-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.skill-item__name {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

.skill-item__bar {
  width: 100%;
  height: 6px;
  background-color: var(--skill-bar-bg);
  border-radius: 3px;
  overflow: hidden;
}

.skill-item__fill {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--accent), var(--accent-hover));
  border-radius: 3px;
  transition: width 1s ease;
}

.skill-item__fill.animate {
  width: var(--level);
}

/* --- Projects --- */
.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-xl);
}

.project-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--border-radius);
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-base),
              box-shadow var(--transition-base),
              border-color var(--transition-fast),
              opacity var(--transition-slow);
  opacity: 0;
  transform: translateY(20px);
}

.project-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.project-card:nth-child(2) { transition-delay: 0.1s; }
.project-card:nth-child(3) { transition-delay: 0.2s; }

.project-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent);
}

.project-card__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-xl);
}

.project-card__icon {
  width: 40px;
  height: 40px;
  color: var(--accent);
}

.project-card__links {
  display: flex;
  gap: var(--space-md);
}

.project-card__link {
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.project-card__link:hover {
  color: var(--accent);
}

.project-card__link svg {
  width: 20px;
  height: 20px;
}

.project-card__title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--space-md);
}

.project-card__description {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: var(--space-xl);
  flex: 1;
}

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

.project-card__tags li {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  opacity: 0.8;
}

.project-card__tags li::before {
  content: "#";
  margin-right: 2px;
  opacity: 0.6;
}

/* --- Contact --- */
.contact__content {
  text-align: center;
  max-width: 500px;
  margin: 0 auto;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-slow),
              transform var(--transition-slow);
}

.contact__content.visible {
  opacity: 1;
  transform: translateY(0);
}

.contact__text {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: var(--space-2xl);
}

.contact__socials {
  display: flex;
  justify-content: center;
  gap: var(--space-xl);
  margin-top: var(--space-2xl);
}

.contact__social {
  color: var(--text-muted);
  transition: color var(--transition-fast),
              transform var(--transition-fast);
}

.contact__social:hover {
  color: var(--accent);
  transform: translateY(-3px);
}

.contact__social svg {
  width: 22px;
  height: 22px;
}

/* --- Footer --- */
.footer {
  padding: var(--space-2xl) 0;
  text-align: center;
  border-top: 1px solid var(--border);
}

.footer__text {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-xs);
}

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

/* --- Responsive --- */

/* Tablet */
@media (max-width: 768px) {
  .nav__links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: center;
    padding: var(--space-xl) 0;
    gap: var(--space-lg);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition-base),
                opacity var(--transition-base);
  }

  .nav__links.active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  .nav__hamburger {
    display: flex;
  }

  .about__grid {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

  .skills__grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: calc(var(--nav-height) + var(--space-2xl));
  }

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

/* Mobile */
@media (max-width: 480px) {
  .hero__name {
    font-size: 2.5rem;
  }

  .hero__title {
    font-size: 1.25rem;
  }

  .hero__cta {
    flex-direction: column;
  }

  .hero__cta .btn {
    text-align: center;
    justify-content: center;
  }

  .hero__scroll-indicator {
    display: none;
  }

  .projects__grid {
    grid-template-columns: 1fr;
  }

  .section__title {
    font-size: 1.4rem;
  }

  .btn--lg {
    width: 100%;
    justify-content: center;
  }
}