/* ===================================
   CSS Variables for Theming: Data + Music + Tech (No Pink)
   - Includes navbar gradient for Light mode and Dark mode
   - Provides --nav-bg (gradient) and --nav-bg-solid (fallback)
   =================================== */
:root {
  /* Light Mode Colors */
  --bg-primary: #f0f4f8;         /* code/cloud/tech */
  --bg-secondary: #e3f2fd;       /* data/light blue */
  --bg-tertiary: #fff7ed;        /* subtle music warm tone */
  --text-primary: #0f172a;       /* dark text for contrast */
  --text-secondary: #1e3a8a;     /* tech blue */
  --text-muted: #64748b;         /* soft muted */
  --accent-primary: #f97316;     /* music highlight (orange) */
  --accent-secondary: #10b981;   /* data green */
  --accent-hover: #14b8a6;       /* interactive cyan-teal */
  --border-color: #cbd5e1;       /* light gray borders */
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
  --shadow-md: 0 6px 10px rgba(0,0,0,0.1);
  --shadow-lg: 0 15px 30px rgba(0,0,0,0.15);
  --card-bg: #ffffff;

  /* NAVBAR — Light mode gradient + fallback solid */
  /* Gradient : plus marqué en haut (nav), fond qui s’estompe vers transparent */
  --nav-bg: linear-gradient(
    to bottom,
    rgba(226, 232, 240, 0.98) 0%,   /* stop 0% — couleur plus dense */
    rgba(236, 242, 248, 0.88) 35%,  /* transition intermédiaire */
    rgba(240, 244, 248, 0.7) 60%,   /* plus léger */
    rgba(240, 244, 248, 0.0) 100%   /* fondu complet vers le body */
  );
  /* Fallback solide (utile pour outils qui n'interprètent pas gradient variables) */
  --nav-bg-solid: rgba(236, 242, 248, 0.9);

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

  /* Typography */
  --font-primary: "Inter", sans-serif;
  --font-mono: "Fira Code", monospace;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
}

/* ===================================
   Dark Mode: fondu doux, toujours dark
   =================================== */
[data-theme="dark"] {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #1f2937;
  --text-primary: #f8fafc;
  --text-secondary: #60a5fa;
  --text-muted: #94a3b8;
  --accent-primary: #f59e0b;
  --accent-secondary: #22c55e;
  --accent-hover: #06b6d4;
  --border-color: #334155;
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.4);
  --shadow-md: 0 6px 10px rgba(0,0,0,0.5);
  --shadow-lg: 0 15px 30px rgba(0,0,0,0.6);
  --card-bg: #1e293b;

  /* NAVBAR — Dark mode gradient (deep, subtle, never bright) */
  --nav-bg: linear-gradient(
    to bottom,
    rgba(15, 23, 42, 0.98) 0%,   /* presque opaque */
    rgba(17, 25, 45, 0.93) 35%,  /* légère transparence */
    rgba(17, 25, 45, 0.85) 70%,  /* dégradé lissé */
    rgba(15, 23, 42, 0.75) 90%,  /* fondu progressif */
    rgba(15, 23, 42, 0.0) 100%   /* disparition douce */
  );
  --nav-bg-solid: rgba(15, 23, 42, 0.95);
}



/* ===================================
   Reset & Base Styles
   =================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-primary);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  overflow-x: hidden;
}

html,
body {
  max-width: 100%;
  overflow-x: hidden;
}

/* Added background canvas styles for animations */
.background-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
}

#matrix-canvas {
  opacity: 0.15;
}

#particles-canvas {
  opacity: 0.3;
}

/* ===================================
   Typography
   =================================== */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  letter-spacing: -0.01em;
}

h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
}

h4 {
  font-size: clamp(1.25rem, 2.5vw, 1.5rem);
}

p {
  margin-bottom: var(--spacing-sm);
  color: var(--text-secondary);
  line-height: 1.7;
}

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

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

/* ===================================
   Navigation
   =================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: var(--nav-bg-solid);

  background: var(--nav-bg), var(--nav-bg-solid);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: background var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
  box-shadow: var(--shadow-sm);
}

/* ombrage décoratif (subtil) */
.navbar::after {
  content: "";
  pointer-events: none;
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 10px;
  background: linear-gradient(to bottom, rgba(0,0,0,0.08), transparent);
  border-radius: 0 0 var(--radius-md) var(--radius-md);
}

.navbar.scrolled {
  box-shadow: var(--shadow-md);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-sm) var(--spacing-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.nav-logo span {
  color: var(--accent-primary);
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
  align-items: center;
}

.nav-link {
  color: var(--text-secondary);
  font-weight: 500;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  position: relative;
}

.nav-link:hover {
  color: var(--accent-primary);
  background: var(--bg-secondary);
}

.nav-link.active {
  color: var(--accent-primary);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 2px;
  background: var(--accent-primary);
  border-radius: 2px;
}

.nav-controls {
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
}

.nav-dropdown {
  position: relative;
}

.nav-dropdown>.nav-link {
  cursor: pointer;
}

.dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  /* juste en dessous du lien parent */
  left: 0;
  background: var(--bg-secondary);
  list-style: none;
  padding: 0.5rem 0;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
  min-width: 150px;
  z-index: 500;
}

.dropdown-menu li a {
  display: block;
  padding: 0.5rem 1rem;
  color: var(--text-secondary);
  font-weight: 500;
  transition: all var(--transition-fast);
}

.dropdown-menu li a:hover {
  background: var(--bg-tertiary);
  color: var(--accent-primary);
}

.nav-dropdown:hover .dropdown-menu {
  display: block;
}

.nav-dropdown>.nav-link::after {
  content: " ▾";
  margin-left: 0.25rem;
  font-size: 0.8rem;
}


.theme-toggle,
.lang-toggle {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.theme-toggle:hover,
.lang-toggle:hover {
  background: var(--bg-tertiary);
  border-color: var(--accent-primary);
  transform: translateY(-2px);
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: var(--spacing-xs);
}

/* ===================================
   Hero Section
   =================================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: calc(70px + var(--spacing-xl)) var(--spacing-lg) var(--spacing-2xl);
  position: relative;
  overflow: hidden;
}

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  opacity: 0.1;
}

.hero-content {
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
  width: 100%;
}

.hero-layout {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-xl);
}

.hero-text {
  flex: 1;
  max-width: 600px;
}

.hero-image {
  flex-shrink: 0;
  display: flex;
  justify-content: center;
  align-items: center;
}

.profile-photo {
  width: 350px;
  height: 350px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--accent-primary);
  box-shadow: 0 0 30px rgba(6, 182, 212, 0.3);
  opacity: 0;
  animation: fadeInScale 1s ease forwards;
}

@keyframes fadeInScale {
  from {
    opacity: 0;
    transform: scale(0.8);
  }

  to {
    opacity: 1;
    transform: scale(1);
  }
}

.hero-greeting {
  font-size: 1.2rem;
  color: var(--accent-primary);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  opacity: 0;
  animation: fadeInUp 0.8s ease forwards;
}

.hero-title {
  margin-bottom: var(--spacing-md);
  opacity: 0;
  animation: fadeInUp 0.8s ease 0.2s forwards;
}

.hero-subtitle {
  font-size: clamp(1.2rem, 2vw, 1.5rem);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
  opacity: 0;
  animation: fadeInUp 0.8s ease 0.4s forwards;
}

.hero-description {
  font-size: 1.1rem;
  max-width: 700px;
  margin: 0 auto var(--spacing-xl);
  opacity: 0;
  animation: fadeInUp 0.8s ease 0.6s forwards;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeInUp 0.8s ease 0.8s forwards;
}

.btn {
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 2px solid transparent;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
}

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

.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover {
  background: var(--accent-primary);
  color: white;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.social-links {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-xl);
}

.social-link {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.social-link:hover {
  background: var(--accent-primary);
  color: white;
  border-color: var(--accent-primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

/* ===================================
   Sections
   =================================== */
.section {
  padding: calc(70px + var(--spacing-lg)) var(--spacing-lg) var(--spacing-2xl);
  max-width: 1200px;
  margin: 0 auto;
}

#about,
#projects,
#contact,
#skills {
  padding-top: -50px;
  /* top compact */
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.section-title {
  position: relative;
  display: inline-block;
  margin-bottom: var(--spacing-md);
}

.section-title::after {
  content: "";
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: var(--accent-primary);
  border-radius: 2px;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 700px;
  margin: 0 auto;
}

/* ===================================
   Cards
   =================================== */
.card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  transition: all var(--transition-normal);
  height: 100%;
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-primary);
}

.card-icon {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  color: white;
  margin-bottom: var(--spacing-md);
}

.card-title {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.card-description {
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===================================
   Grid Layouts
   =================================== */
.grid {
  display: grid;
  gap: var(--spacing-lg);
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

/* ===================================
   About Section
   =================================== */
.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  align-items: center;
}

.about-image {
  position: relative;
}

.about-image img {
  width: 100%;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
}

.about-text h3 {
  color: var(--accent-primary);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

.about-text h2 {
  margin-bottom: var(--spacing-md);
}

.about-text p {
  margin-bottom: var(--spacing-md);
}

/* .skills-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-sm);
  margin-top: var(--spacing-lg);
}

.skill-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--text-secondary);
  font-weight: 500;
}

.skill-item::before {
  content: "▹";
  color: var(--accent-primary);
  font-size: 1.2rem;
} */
/* ===================================
   Skills Section (Compact & Fixed Height)
=================================== */
#skills {
  padding: 3rem 2rem 0.2rem 2rem;
  background-color: var(--bg-section);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  min-height: 300px;
  box-sizing: border-box;
}

#skills .section-header {
  text-align: center;
  margin-bottom: 1rem;
}

#skills .section-title {
  font-size: 2rem;
  color: var(--text-primary);
  margin-bottom: 0.3rem;
}

#skills .section-subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.skill-filters {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.skill-filters .filter-btn {
  padding: 0.3rem 0.6rem;
  border: none;
  border-radius: 5px;
  background-color: var(--bg-secondary);
  cursor: pointer;
  transition: all 0.3s ease;
}

.skill-filters .filter-btn.active,
.skill-filters .filter-btn:hover {
  background-color: var(--accent-primary);
  color: #fff;
}

#skills .skill-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: 0.8rem;
  text-align: center;
}

.skill-category {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--accent-primary);
  margin-bottom: 0.5rem;
  text-align: center;
  position: relative;
}

.skill-category::after {
  content: "";
  display: block;
  width: 30px;
  height: 3px;
  background-color: var(--accent-primary);
  margin: 0.2rem auto 0;
  border-radius: 2px;
}

.skills-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
}

.skill-badge {
  padding: 0.3rem 0.6rem;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-primary);
  white-space: nowrap;
}

.skill-badge:hover {
  background: var(--accent-primary);
  color: #fff;
  transform: scale(1.05);
  cursor: default;
}

.skills-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  padding: 0;
}



/* ===================================
   Timeline (Education/Experience)
   =================================== */
.timeline {
  position: relative;
  padding-left: var(--spacing-xl);
}

.timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border-color);
}

.timeline-item {
  position: relative;
  margin-bottom: var(--spacing-xl);
  padding-left: var(--spacing-lg);
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -42px;
  top: 0;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent-primary);
  border: 3px solid var(--bg-primary);
  box-shadow: 0 0 0 3px var(--accent-primary);
}

.timeline-date {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent-primary);
  margin-bottom: var(--spacing-sm);
}

.timeline-content {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  transition: all var(--transition-normal);
}

.timeline-content:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent-primary);
}

.timeline-title {
  font-size: 1.3rem;
  margin-bottom: var(--spacing-xs);
  color: var(--text-primary);
}

.timeline-subtitle {
  color: var(--accent-primary);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.timeline-description {
  color: var(--text-secondary);
  line-height: 1.7;
}

.timeline-description ul {
  margin-top: var(--spacing-sm);
  padding-left: var(--spacing-lg);
}

.timeline-description li {
  margin-bottom: var(--spacing-xs);
}

/* ===================================
   Projects
   =================================== */
.project-filters {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: var(--spacing-xl);
}

.filter-btn {
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

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

.project-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-primary);
}

.project-image {
  width: 100%;
  height: 220px;
  object-fit: cover;
  background: var(--bg-secondary);
}

.project-content {
  padding: var(--spacing-lg);
}

.project-category {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: var(--bg-secondary);
  color: var(--accent-primary);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.project-title {
  font-size: 1.3rem;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.project-description {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
  line-height: 1.6;
}

.project-tags {
  display: flex;
  gap: var(--spacing-xs);
  flex-wrap: wrap;
  margin-bottom: var(--spacing-md);
}

.project-tag {
  padding: 0.25rem 0.75rem;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.project-links {
  display: flex;
  gap: var(--spacing-sm);
}

.project-link {
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-weight: 500;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.project-link:hover {
  background: var(--accent-primary);
  color: white;
  border-color: var(--accent-primary);
}

/* ===================================
   Contact Form
   =================================== */
.contact-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  transition: all var(--transition-normal);
}

.contact-item:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent-primary);
}

.contact-icon {
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: white;
  flex-shrink: 0;
}

.contact-details h4 {
  margin-bottom: var(--spacing-xs);
  color: var(--text-primary);
}

.contact-details p {
  color: var(--text-secondary);
  margin: 0;
}

.contact-form {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
}

.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-group label {
  display: block;
  margin-bottom: var(--spacing-xs);
  color: var(--text-primary);
  font-weight: 600;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: var(--spacing-sm);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-primary);
  font-size: 1rem;
  transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 150px;
}

.form-submit {
  width: 100%;
  padding: var(--spacing-md);
  background: var(--accent-primary);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.form-submit:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.form-submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.form-message {
  margin-top: var(--spacing-md);
  padding: var(--spacing-sm);
  border-radius: var(--radius-md);
  text-align: center;
  font-weight: 500;
}

.form-message.success {
  background: rgba(34, 197, 94, 0.1);
  color: #22c55e;
  border: 1px solid #22c55e;
}

.form-message.error {
  background: rgba(239, 68, 68, 0.1);
  color: #ef4444;
  border: 1px solid #ef4444;
}

/* Style pour le select du formulaire */
.contact-form select {
  width: 100%;
  padding: 0.6rem 0.8rem;
  font-size: 1rem;
  border: 1px solid #ccc;
  border-radius: 5px;
  background-color: var(--bg-secondary);
  /* cohérent avec le thème */
  color: var(--text-primary);
  outline: none;
  transition: border 0.3s, box-shadow 0.3s;
}

.contact-form select:focus {
  border-color: #007BFF;
  box-shadow: 0 0 5px rgba(0, 123, 255, 0.5);
}

.contact-form select option {
  color: var(--text-primary);
  background-color: var(--bg-primary);
}

/* Toast notification */
.toast {
  position: fixed;
  top: 2rem;
  right: 2rem;
  padding: 1rem 1.5rem;
  border-radius: 6px;
  color: #fff;
  font-weight: 500;
  z-index: 10000;
  opacity: 0.95;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
  font-family: 'Inter', sans-serif;
  pointer-events: none;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.toast.success {
  background-color: #28a745;
}

.toast.error {
  background-color: #dc3545;
}

.toast.show {
  transform: translateY(0);
  opacity: 0.95;
}

.toast.hide {
  transform: translateY(-20px);
  opacity: 0;
}


/* ===================================
   Footer
   =================================== */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: var(--spacing-xl) var(--spacing-lg);
  margin-top: var(--spacing-2xl);
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
}

.footer-section h3 {
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.footer-section p {
  color: var(--text-muted);
  line-height: 1.7;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: var(--spacing-sm);
}

.footer-links a {
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--accent-primary);
}

.footer-bottom {
  max-width: 1200px;
  margin: var(--spacing-xl) auto 0;
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border-color);
  text-align: center;
  color: var(--text-muted);
}

/* ===================================
   Animations
   =================================== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

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

@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@keyframes float {

  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(-20px);
  }
}

.fade-in {
  opacity: 0;
  animation: fadeIn 0.8s ease forwards;
}

.slide-in-left {
  opacity: 0;
  transform: translateX(-50px);
  transition: all 0.8s ease;
}

.slide-in-right {
  opacity: 0;
  transform: translateX(50px);
  transition: all 0.8s ease;
}

.slide-in-up {
  opacity: 0;
  transform: translateY(50px);
  transition: all 0.8s ease;
}

.slide-in-left.visible,
.slide-in-right.visible,
.slide-in-up.visible {
  opacity: 1;
  transform: translate(0, 0);
}

/* ===================================
   Back to Top Button
   =================================== */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 50px;
  height: 50px;
  background: var(--accent-primary);
  color: white;
  border: none;
  border-radius: 50%;
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-normal);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  z-index: 999;
}

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

.back-to-top:hover {
  background: var(--accent-hover);
  transform: translateY(-5px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
}

.back-to-top:active {
  transform: translateY(-2px);
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 968px) {
  .nav-menu {
    position: fixed;
    top: 70px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 70px);
    background: var(--nav-bg);
    backdrop-filter: blur(10px);
    flex-direction: column;
    padding: var(--spacing-xl);
    transition: left var(--transition-normal);
    border-right: 1px solid var(--border-color);
  }

  .nav-menu.active {
    left: 0;
  }

  .mobile-toggle {
    display: block;
  }

  .about-content,
  .contact-container {
    grid-template-columns: 1fr;
  }

  .timeline {
    padding-left: var(--spacing-lg);
  }

  .timeline-item::before {
    left: -26px;
  }

  /* Responsive profile photo */
  .profile-photo {
    width: 250px;
    height: 250px;
  }

  /* Stack hero layout on tablets and mobile */
  .hero-layout {
    flex-direction: column-reverse;
    text-align: center;
  }

  .hero-text {
    max-width: 100%;
  }

  .hero-cta {
    justify-content: center;
  }

  .social-links {
    justify-content: center;
  }

  /* Adjust back to top button position on mobile */
  .back-to-top {
    bottom: 1.5rem;
    right: 2.5rem;
    width: 45px;
    height: 45px;
    font-size: 1rem;
  }
}

@media (max-width: 768px) {

  /* ===================================
     Skills Section Responsive Adjustments
     =================================== */
  #skills {
    padding: 1rem 1rem 0.5rem 1rem;
    /* top 4rem, bottom 1rem */
  }

  .skill-category {
    font-size: 1.1rem;
  }

  .skill-badge {
    padding: 0.25rem 0.5rem;
    font-size: 0.8rem;
  }
}

@media (max-width: 640px) {
  .hero-cta {
    flex-direction: column;
    align-items: stretch;
  }

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

  .skills-list {
    grid-template-columns: 1fr;
  }

  .project-filters {
    flex-direction: column;
  }

  .filter-btn {
    width: 100%;
  }

  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  /* Smaller profile photo on mobile */
  .profile-photo {
    width: 200px;
    height: 200px;
  }

  /* Smaller back to top button on small screens */
  .back-to-top {
    bottom: 1rem;
    right: 2rem;
    width: 40px;
    height: 40px;
    font-size: 0.9rem;
  }
}

/* ===================================
   Utility Classes
   =================================== */
.text-center {
  text-align: center;
}

.text-gradient {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.mt-1 {
  margin-top: var(--spacing-sm);
}

.mt-2 {
  margin-top: var(--spacing-md);
}

.mt-3 {
  margin-top: var(--spacing-lg);
}

.mt-4 {
  margin-top: var(--spacing-xl);
}

.mb-1 {
  margin-bottom: var(--spacing-sm);
}

.mb-2 {
  margin-bottom: var(--spacing-md);
}

.mb-3 {
  margin-bottom: var(--spacing-lg);
}

.mb-4 {
  margin-bottom: var(--spacing-xl);
}

.hidden {
  display: none;
}

@media (max-width: 480px) {
  .back-to-top {
    right: 1.5rem;
  }

  .section {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .section>.grid,
  .section>.grid-2,
  .section>.grid-3 {
    width: 100%;
    justify-content: center;
  }
}