/* ============================================
   HABIBULLAH MEZBAH — PORTFOLIO DESIGN SYSTEM
   Inspired by Stripe, Vercel, GitHub, Linear
   ============================================ */

/* ── Google Fonts ── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* ── CSS Custom Properties (Light Theme — Default) ── */
:root {
  /* Colors */
  --bg-primary: #FAFAFA;
  --bg-secondary: #FFFFFF;
  --bg-card: #FFFFFF;
  --bg-card-hover: #F8FAFC;
  --bg-hero: #F0F0F5;
  --text-primary: #0F172A;
  --text-secondary: #64748B;
  --text-tertiary: #94A3B8;
  --accent: #6366F1;
  --accent-hover: #4F46E5;
  --accent-light: rgba(99, 102, 241, 0.1);
  --accent-medium: rgba(99, 102, 241, 0.15);
  --gradient-start: #6366F1;
  --gradient-mid: #7C3AED;
  --gradient-end: #8B5CF6;
  --border: #E2E8F0;
  --border-light: #F1F5F9;
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(255, 255, 255, 0.3);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.08);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.1);
  --shadow-accent: 0 4px 24px rgba(99, 102, 241, 0.25);
  --nav-bg: rgba(255, 255, 255, 0.8);
  --code-bg: #F1F5F9;
  --tag-bg: #EEF2FF;
  --tag-text: #4F46E5;
  --success: #10B981;
  --warning: #F59E0B;
  --error: #EF4444;
  --overlay: rgba(0, 0, 0, 0.5);

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --fs-xs: 0.75rem;
  --fs-sm: 0.875rem;
  --fs-base: 1rem;
  --fs-lg: 1.125rem;
  --fs-xl: 1.25rem;
  --fs-2xl: 1.5rem;
  --fs-3xl: 2rem;
  --fs-4xl: 2.5rem;
  --fs-5xl: 3rem;
  --fs-6xl: 3.75rem;
  --fs-hero: clamp(2.5rem, 5vw, 4.5rem);
  --lh-tight: 1.2;
  --lh-normal: 1.6;
  --lh-relaxed: 1.8;

  /* 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;
  --space-section: clamp(4rem, 8vw, 7rem);

  /* Layout */
  --max-width: 1200px;
  --nav-height: 72px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ── Dark Theme ── */
[data-theme="dark"] {
  --bg-primary: #0A0A0F;
  --bg-secondary: #12121A;
  --bg-card: #1A1A25;
  --bg-card-hover: #22222F;
  --bg-hero: #0D0D14;
  --text-primary: #F1F5F9;
  --text-secondary: #94A3B8;
  --text-tertiary: #64748B;
  --accent: #818CF8;
  --accent-hover: #6366F1;
  --accent-light: rgba(129, 140, 248, 0.1);
  --accent-medium: rgba(129, 140, 248, 0.15);
  --gradient-start: #818CF8;
  --gradient-mid: #A78BFA;
  --gradient-end: #C084FC;
  --border: #2A2A3A;
  --border-light: #1E1E2A;
  --glass-bg: rgba(18, 18, 26, 0.8);
  --glass-border: rgba(255, 255, 255, 0.08);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.5);
  --shadow-accent: 0 4px 24px rgba(129, 140, 248, 0.2);
  --nav-bg: rgba(10, 10, 15, 0.85);
  --code-bg: #1E1E2E;
  --tag-bg: rgba(129, 140, 248, 0.12);
  --tag-text: #A5B4FC;
  --overlay: rgba(0, 0, 0, 0.7);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: var(--lh-normal);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  transition: background-color var(--transition-slow), color var(--transition-slow);
}

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

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

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

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  outline: none;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
  outline: none;
}

::selection {
  background: var(--accent);
  color: white;
}

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

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

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

::-webkit-scrollbar-thumb:hover {
  background: var(--text-tertiary);
}

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

.section {
  padding: var(--space-section) 0;
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-4xl);
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-md);
  padding: var(--space-xs) var(--space-md);
  background: var(--accent-light);
  border-radius: var(--radius-full);
  border: 1px solid var(--accent-medium);
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
  line-height: var(--lh-tight);
}

.section-description {
  font-size: var(--fs-lg);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
  line-height: var(--lh-relaxed);
}

.gradient-text {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-mid), var(--gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.75rem 1.5rem;
  font-size: var(--fs-sm);
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.1), rgba(255,255,255,0));
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.btn:hover::after {
  opacity: 1;
}

.btn-primary {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: #FFFFFF;
  box-shadow: var(--shadow-accent);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 32px rgba(99, 102, 241, 0.35);
  color: #FFFFFF;
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border);
}

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

.btn-ghost {
  color: var(--text-secondary);
  padding: 0.75rem 1rem;
}

.btn-ghost:hover {
  color: var(--accent);
  background: var(--accent-light);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: var(--fs-xs);
}

.btn-lg {
  padding: 1rem 2rem;
  font-size: var(--fs-base);
}

/* ── Navigation ── */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 1000;
  transition: all var(--transition-base);
}

.navbar.scrolled {
  background: var(--nav-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-logo {
  font-size: var(--fs-xl);
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.nav-logo .logo-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  animation: pulse-dot 2s ease-in-out infinite;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

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

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
}

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

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

.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border);
  transition: all var(--transition-fast);
  font-size: var(--fs-lg);
}

.theme-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
  transform: rotate(15deg);
}

.mobile-toggle {
  display: none;
  width: 40px;
  height: 40px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid var(--border);
}

.mobile-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

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

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

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

/* ── Hero Section ── */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-height);
  position: relative;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
  z-index: 0;
}

.hero-bg .gradient-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.4;
  animation: float-orb 15s ease-in-out infinite;
}

[data-theme="dark"] .hero-bg .gradient-orb {
  opacity: 0.15;
}

.hero-bg .orb-1 {
  width: 600px;
  height: 600px;
  background: var(--gradient-start);
  top: -200px;
  right: -100px;
  animation-delay: 0s;
}

.hero-bg .orb-2 {
  width: 400px;
  height: 400px;
  background: var(--gradient-end);
  bottom: -100px;
  left: -100px;
  animation-delay: -5s;
}

.hero-bg .orb-3 {
  width: 300px;
  height: 300px;
  background: var(--gradient-mid);
  top: 50%;
  left: 50%;
  animation-delay: -10s;
}

.hero-grid-pattern {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(var(--border) 1px, transparent 1px);
  background-size: 30px 30px;
  opacity: 0.5;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

.hero .container {
  position: relative;
  z-index: 1;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4xl);
  align-items: center;
}

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

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--accent-light);
  border: 1px solid var(--accent-medium);
  border-radius: var(--radius-full);
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--accent);
  margin-bottom: var(--space-xl);
}

.hero-badge .status-dot {
  width: 8px;
  height: 8px;
  background: var(--success);
  border-radius: 50%;
  animation: pulse-dot 2s ease-in-out infinite;
}

.hero-name {
  font-size: var(--fs-hero);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: var(--space-md);
  letter-spacing: -0.03em;
}

.hero-title {
  font-size: var(--fs-2xl);
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.hero-title .typing-cursor {
  display: inline-block;
  width: 3px;
  height: 1.2em;
  background: var(--accent);
  animation: blink 1s step-end infinite;
  margin-left: 2px;
}

.hero-description {
  font-size: var(--fs-lg);
  color: var(--text-secondary);
  line-height: var(--lh-relaxed);
  margin-bottom: var(--space-2xl);
  max-width: 520px;
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin-bottom: var(--space-3xl);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
}

.stat-item {
  text-align: center;
  padding: var(--space-lg);
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}

.stat-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-medium);
}

.stat-number {
  font-size: var(--fs-3xl);
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
  margin-bottom: var(--space-xs);
  font-variant-numeric: tabular-nums;
}

.stat-label {
  font-size: var(--fs-xs);
  font-weight: 500;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Hero Image */
.hero-image-wrapper {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.hero-image-container {
  position: relative;
  width: 380px;
  height: 380px;
}

.hero-image {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--border);
  position: relative;
  z-index: 2;
  transition: all var(--transition-slow);
}

.hero-image:hover {
  border-color: var(--accent);
  transform: scale(1.02);
}

.hero-image-ring {
  position: absolute;
  inset: -12px;
  border-radius: 50%;
  border: 2px dashed var(--accent-medium);
  animation: spin-slow 30s linear infinite;
  z-index: 1;
}

.hero-image-glow {
  position: absolute;
  inset: -40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  opacity: 0.15;
  filter: blur(40px);
  z-index: 0;
  animation: pulse-glow 4s ease-in-out infinite;
}

.hero-floating-badge {
  position: absolute;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-sm) var(--space-md);
  font-size: var(--fs-xs);
  font-weight: 600;
  color: var(--text-primary);
  box-shadow: var(--shadow-md);
  z-index: 3;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  animation: float-badge 6s ease-in-out infinite;
}

.hero-floating-badge.badge-top {
  top: 20px;
  right: -20px;
}

.hero-floating-badge.badge-bottom {
  bottom: 40px;
  left: -30px;
  animation-delay: -3s;
}

.hero-floating-badge .badge-icon {
  font-size: var(--fs-lg);
}

/* ── About Section ── */
.about {
  background: var(--bg-secondary);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4xl);
  align-items: start;
}

.about-text h3 {
  font-size: var(--fs-2xl);
  font-weight: 700;
  margin-bottom: var(--space-lg);
  color: var(--text-primary);
}

.about-text p {
  font-size: var(--fs-base);
  color: var(--text-secondary);
  line-height: var(--lh-relaxed);
  margin-bottom: var(--space-lg);
}

.about-info {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
}

.about-info h3 {
  font-size: var(--fs-xl);
  font-weight: 700;
  margin-bottom: var(--space-xl);
  color: var(--text-primary);
}

.info-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--border-light);
}

.info-item:last-child {
  border-bottom: none;
}

.info-icon {
  width: 40px;
  height: 40px;
  min-width: 40px;
  border-radius: var(--radius-md);
  background: var(--accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-size: var(--fs-lg);
}

.info-content .info-label {
  font-size: var(--fs-xs);
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 2px;
}

.info-content .info-value {
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--text-primary);
}

.info-content .info-value a {
  color: var(--accent);
}

.info-content .info-value a:hover {
  text-decoration: underline;
}

/* Education Card */
.education-card {
  margin-top: var(--space-xl);
  padding: var(--space-xl);
  background: linear-gradient(135deg, var(--accent-light), transparent);
  border: 1px solid var(--accent-medium);
  border-radius: var(--radius-lg);
}

.education-card .edu-icon {
  font-size: var(--fs-2xl);
  margin-bottom: var(--space-sm);
}

.education-card h4 {
  font-size: var(--fs-lg);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.education-card p {
  font-size: var(--fs-sm);
  color: var(--text-secondary);
  margin-bottom: 2px;
}

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

.skill-category {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.skill-category::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
  opacity: 0;
  transition: opacity var(--transition-base);
}

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

.skill-category:hover::before {
  opacity: 1;
}

.skill-category-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.skill-category-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--fs-2xl);
}

.skill-category-title {
  font-size: var(--fs-xl);
  font-weight: 700;
  color: var(--text-primary);
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.skill-tag {
  padding: var(--space-sm) var(--space-md);
  background: var(--tag-bg);
  color: var(--tag-text);
  font-size: var(--fs-sm);
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  border: 1px solid transparent;
}

.skill-tag:hover {
  background: var(--accent);
  color: #FFFFFF;
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

/* ── Experience Section ── */
.experience {
  background: var(--bg-secondary);
}

.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 24px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent), var(--border));
}

.timeline-item {
  position: relative;
  padding-left: 72px;
  margin-bottom: var(--space-3xl);
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-dot {
  position: absolute;
  left: 14px;
  top: 4px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 3px solid var(--accent);
  z-index: 1;
  transition: all var(--transition-base);
}

.timeline-item:hover .timeline-dot {
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-light);
}

.timeline-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  transition: all var(--transition-base);
}

.timeline-card:hover {
  border-color: var(--accent-medium);
  box-shadow: var(--shadow-md);
  transform: translateX(4px);
}

.timeline-header {
  display: flex;
  align-items: start;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
  gap: var(--space-md);
}

.timeline-role {
  font-size: var(--fs-xl);
  font-weight: 700;
  color: var(--text-primary);
}

.timeline-company {
  font-size: var(--fs-base);
  color: var(--accent);
  font-weight: 500;
  margin-top: 2px;
}

.timeline-period {
  font-size: var(--fs-xs);
  font-weight: 600;
  color: var(--text-tertiary);
  padding: var(--space-xs) var(--space-md);
  background: var(--tag-bg);
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.timeline-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.timeline-list li {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--fs-sm);
  color: var(--text-secondary);
}

.timeline-list li::before {
  content: '▸';
  color: var(--accent);
  font-weight: 700;
}

/* ── Portfolio Section ── */
.portfolio {
  background: var(--bg-secondary);
}

.portfolio-filters {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-3xl);
}

.filter-btn {
  padding: var(--space-sm) var(--space-lg);
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

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

.filter-btn.active {
  background: var(--accent);
  color: #FFFFFF;
  border-color: var(--accent);
  box-shadow: var(--shadow-accent);
}

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

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

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

.project-image {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background: var(--bg-hero);
}

.project-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.project-card:hover .project-image img {
  transform: scale(1.05);
}

.project-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.8), transparent);
  opacity: 0;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: var(--space-xl);
  gap: var(--space-sm);
  transition: opacity var(--transition-base);
}

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

.project-overlay .btn {
  font-size: var(--fs-xs);
  padding: 0.5rem 1rem;
}

.project-info {
  padding: var(--space-xl);
}

.project-category {
  font-size: var(--fs-xs);
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-sm);
}

.project-name {
  font-size: var(--fs-xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}

.project-description {
  font-size: var(--fs-sm);
  color: var(--text-secondary);
  line-height: var(--lh-relaxed);
  margin-bottom: var(--space-lg);
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.project-tech span {
  padding: 3px 10px;
  background: var(--tag-bg);
  color: var(--tag-text);
  font-size: var(--fs-xs);
  font-weight: 500;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
}

.project-features {
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--border-light);
}

.project-features ul {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xs);
}

.project-features li {
  font-size: var(--fs-xs);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.project-features li::before {
  content: '✓';
  color: var(--success);
  font-weight: 700;
  font-size: var(--fs-xs);
}

/* ── Services Section ── */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

.service-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  text-align: center;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--accent-light), transparent);
  opacity: 0;
  transition: opacity var(--transition-base);
}

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

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

.service-card > * {
  position: relative;
  z-index: 1;
}

.service-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-lg);
  background: var(--accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  margin: 0 auto var(--space-lg);
  transition: all var(--transition-base);
}

.service-card:hover .service-icon {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  transform: scale(1.1) rotate(5deg);
}

.service-card:hover .service-icon span {
  filter: brightness(10);
}

.service-title {
  font-size: var(--fs-lg);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}

.service-description {
  font-size: var(--fs-sm);
  color: var(--text-secondary);
  line-height: var(--lh-relaxed);
}

/* ── Testimonials Section ── */
.testimonials {
  background: var(--bg-secondary);
}

.testimonials-slider {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
  overflow: hidden;
}

.testimonials-track {
  display: flex;
  transition: transform var(--transition-slow);
}

.testimonial-card {
  min-width: 100%;
  padding: 0 var(--space-xl);
}

.testimonial-content {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--space-3xl);
  text-align: center;
  position: relative;
}

.testimonial-quote {
  font-size: var(--fs-3xl);
  color: var(--accent);
  opacity: 0.3;
  position: absolute;
  top: var(--space-lg);
  left: var(--space-xl);
  font-family: Georgia, serif;
  line-height: 1;
}

.testimonial-text {
  font-size: var(--fs-lg);
  color: var(--text-secondary);
  line-height: var(--lh-relaxed);
  margin-bottom: var(--space-2xl);
  font-style: italic;
}

.testimonial-author {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
}

.testimonial-avatar {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--border);
}

.testimonial-info {
  text-align: left;
}

.testimonial-name {
  font-size: var(--fs-base);
  font-weight: 700;
  color: var(--text-primary);
}

.testimonial-role {
  font-size: var(--fs-sm);
  color: var(--text-secondary);
}

.testimonial-stars {
  display: flex;
  gap: 2px;
  justify-content: center;
  margin-bottom: var(--space-lg);
  color: #F59E0B;
  font-size: var(--fs-lg);
}

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

.testimonials-nav button {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-primary);
  font-size: var(--fs-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.testimonials-nav button:hover {
  background: var(--accent);
  color: #FFFFFF;
  border-color: var(--accent);
}

.testimonials-dots {
  display: flex;
  justify-content: center;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
}

.testimonials-dots .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.testimonials-dots .dot.active {
  background: var(--accent);
  width: 24px;
  border-radius: var(--radius-full);
}

/* ── Blog Section ── */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

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

.blog-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-medium);
}

.blog-image {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--bg-hero);
}

.blog-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.blog-card:hover .blog-image img {
  transform: scale(1.05);
}

.blog-content {
  padding: var(--space-xl);
}

.blog-tag {
  display: inline-block;
  font-size: var(--fs-xs);
  font-weight: 600;
  color: var(--accent);
  padding: 2px 10px;
  background: var(--tag-bg);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-md);
}

.blog-title {
  font-size: var(--fs-lg);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
  line-height: var(--lh-tight);
  transition: color var(--transition-fast);
}

.blog-card:hover .blog-title {
  color: var(--accent);
}

.blog-excerpt {
  font-size: var(--fs-sm);
  color: var(--text-secondary);
  line-height: var(--lh-relaxed);
  margin-bottom: var(--space-lg);
}

.blog-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--fs-xs);
  color: var(--text-tertiary);
}

.blog-read-more {
  font-weight: 600;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  transition: gap var(--transition-fast);
}

.blog-card:hover .blog-read-more {
  gap: var(--space-sm);
}

/* ── Contact Section ── */
.contact {
  background: var(--bg-secondary);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4xl);
}

.contact-form-wrapper {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
}

.contact-form-wrapper h3 {
  font-size: var(--fs-2xl);
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.contact-form-wrapper p {
  font-size: var(--fs-sm);
  color: var(--text-secondary);
  margin-bottom: var(--space-2xl);
}

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

.form-group label {
  display: block;
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

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

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-tertiary);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
}

.form-success {
  display: none;
  padding: var(--space-lg);
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: var(--radius-md);
  color: var(--success);
  font-weight: 500;
  text-align: center;
  margin-top: var(--space-md);
}

.form-success.show {
  display: block;
}

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

.contact-info h3 {
  font-size: var(--fs-2xl);
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.contact-info > p {
  font-size: var(--fs-sm);
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
}

.contact-card {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  padding: var(--space-lg);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}

.contact-card:hover {
  border-color: var(--accent-medium);
  transform: translateX(4px);
  box-shadow: var(--shadow-md);
}

.contact-card-icon {
  width: 48px;
  height: 48px;
  min-width: 48px;
  border-radius: var(--radius-md);
  background: var(--accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--fs-xl);
  color: var(--accent);
}

.contact-card-label {
  font-size: var(--fs-xs);
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.contact-card-value {
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--text-primary);
}

.contact-card-value a {
  color: var(--accent);
}

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

.social-link {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--fs-xl);
  color: var(--text-secondary);
  transition: all var(--transition-base);
}

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

/* ── Footer ── */
.footer {
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  padding: var(--space-4xl) 0 var(--space-xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-3xl);
  margin-bottom: var(--space-3xl);
}

.footer-brand p {
  font-size: var(--fs-sm);
  color: var(--text-secondary);
  line-height: var(--lh-relaxed);
  margin-top: var(--space-md);
  max-width: 300px;
}

.footer-column h4 {
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-lg);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer-links a {
  font-size: var(--fs-sm);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.footer-links a:hover {
  color: var(--accent);
  transform: translateX(4px);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-xl);
  border-top: 1px solid var(--border);
  font-size: var(--fs-sm);
  color: var(--text-tertiary);
}

.footer-bottom-links {
  display: flex;
  gap: var(--space-lg);
}

.footer-bottom-links a {
  color: var(--text-tertiary);
  font-size: var(--fs-sm);
}

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

/* ── Back to Top ── */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--fs-xl);
  box-shadow: var(--shadow-accent);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-base);
}

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

.back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(99, 102, 241, 0.4);
  color: #FFFFFF;
}

/* ── Loading Screen ── */
.loading-screen {
  position: fixed;
  inset: 0;
  background: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  transition: opacity 0.6s ease, visibility 0.6s ease;
}

.loading-screen.hidden {
  opacity: 0;
  visibility: hidden;
}

.loading-spinner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
}

.loading-spinner .spinner {
  width: 48px;
  height: 48px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.loading-spinner .loading-text {
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

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

/* Tablet */
@media (max-width: 1024px) {
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--space-3xl);
  }

  .hero-text {
    max-width: 100%;
    order: 2;
  }

  .hero-image-wrapper {
    order: 1;
  }

  .hero-description {
    margin: 0 auto var(--space-2xl);
  }

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

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero-image-container {
    width: 280px;
    height: 280px;
  }

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

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

  .portfolio-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .blog-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Mobile */
@media (max-width: 768px) {
  :root {
    --space-section: 3.5rem;
  }

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

  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--nav-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: var(--space-lg);
    gap: var(--space-xs);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: 999;
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .mobile-toggle {
    display: flex;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
  }

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

  .stat-number {
    font-size: var(--fs-2xl);
  }

  .hero-floating-badge {
    display: none;
  }

  .hero-image-container {
    width: 220px;
    height: 220px;
  }

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

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

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

  .form-row {
    grid-template-columns: 1fr;
  }

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

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-md);
    text-align: center;
  }

  .timeline::before {
    left: 16px;
  }

  .timeline-item {
    padding-left: 52px;
  }

  .timeline-dot {
    left: 8px;
    width: 18px;
    height: 18px;
  }

  .timeline-header {
    flex-direction: column;
  }

  .testimonial-card {
    padding: 0 var(--space-sm);
  }

  .testimonial-content {
    padding: var(--space-xl);
  }

  .testimonial-text {
    font-size: var(--fs-base);
  }

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

/* Small Mobile */
@media (max-width: 480px) {
  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .hero-buttons .btn {
    width: 100%;
  }

  .hero-stats {
    grid-template-columns: 1fr 1fr;
  }

  .portfolio-filters {
    flex-direction: column;
    align-items: center;
  }

  .project-features ul {
    grid-template-columns: 1fr;
  }

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

/* ── Print Styles ── */
@media print {
  .navbar,
  .back-to-top,
  .loading-screen,
  .theme-toggle {
    display: none !important;
  }

  body {
    color: #000;
    background: #fff;
  }

  .section {
    padding: 1rem 0;
  }
}