/* ============================================
   SAYEM SIDDIQUE PORTFOLIO - STYLESHEET
   Phase 3: Base Layout & Typography
   ============================================ */

/* ---------- CSS VARIABLES ---------- */
:root {
  /* Light Theme Colors (Default) - Soft Blue Palette */
  --bg: #ffffff;
  --bg-alt: #f0f7ff;
  --text: #1e293b;
  --text-muted: #64748b;
  --accent: #3b82f6;
  --accent-light: #60a5fa;
  --accent-hover: #2563eb;
  --accent-subtle: rgba(59, 130, 246, 0.1);
  --card: #ffffff;
  --card-border: #e2e8f0;
  --header-bg: rgba(255, 255, 255, 0.92);
  --shadow-color: rgba(59, 130, 246, 0.08);
  --gradient-start: #eff6ff;
  --gradient-end: #ffffff;
  
  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  --font-size-base: 1rem;
  --font-size-sm: 0.875rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --line-height: 1.6;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --spacing-3xl: 6rem;
  
  /* Layout */
  --container-max: 1100px;
  --container-padding: 1.25rem;
  --header-height: 70px;
  
  /* Effects */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
  --transition: 0.3s ease;
}

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

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

/* Skip link for accessibility */
.skip-link {
  position: absolute;
  top: -100%;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--accent);
  color: #ffffff;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  z-index: 9999;
  font-weight: 600;
  transition: top var(--transition);
}

.skip-link:focus {
  top: var(--spacing-sm);
  color: #ffffff;
}

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

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

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

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

ul {
  list-style: none;
}

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

/* ---------- CONTAINER ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* ---------- TYPOGRAPHY ---------- */
h1, h2, h3, h4, h5, h6 {
  line-height: 1.3;
  font-weight: 600;
  color: var(--text);
}

h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }

p {
  margin-bottom: var(--spacing-sm);
}

p:last-child {
  margin-bottom: 0;
}

/* ---------- SECTION DEFAULTS ---------- */
.section {
  padding: var(--spacing-2xl) 0;
}

.section__title {
  text-align: center;
  margin-bottom: var(--spacing-md);
  position: relative;
}

.section__subtitle {
  text-align: center;
  color: var(--text-muted);
  margin-bottom: var(--spacing-xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ---------- HEADER / NAVIGATION ---------- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background-color: var(--header-bg);
  backdrop-filter: blur(10px);
  z-index: 1000;
  border-bottom: 1px solid var(--card-border);
}

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

.nav__logo {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--text);
}

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

.nav__menu {
  display: flex;
  gap: var(--spacing-md);
}

.nav__link {
  color: var(--text-muted);
  font-size: var(--font-size-sm);
  font-weight: 500;
  padding: var(--spacing-xs) 0;
  position: relative;
}

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

.nav__toggle {
  display: none;
  width: 32px;
  height: 32px;
  position: relative;
}

.hamburger,
.hamburger::before,
.hamburger::after {
  width: 24px;
  height: 2px;
  background-color: var(--text);
  position: absolute;
  transition: var(--transition);
}

.hamburger {
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.hamburger::before,
.hamburger::after {
  content: '';
  left: 0;
}

.hamburger::before { top: -7px; }
.hamburger::after { top: 7px; }

/* Theme Toggle */
.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--bg-alt);
  transition: background-color var(--transition);
}

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

.theme-toggle__icon::before {
  content: '☀️';
  font-size: 1.2rem;
}

/* Mobile Navigation */
@media (max-width: 768px) {
  .nav__toggle {
    display: block;
  }
  
  .nav__menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--bg);
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-lg) 0;
    gap: var(--spacing-sm);
    border-bottom: 1px solid var(--card-border);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
  }
  
  .nav__menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .nav__link {
    font-size: var(--font-size-base);
    padding: var(--spacing-xs) var(--spacing-sm);
  }
  
  .nav__item--cta {
    margin-top: var(--spacing-xs);
  }
}

/* Hide resume button on desktop nav (show in hero instead) */
@media (min-width: 769px) {
  .nav__item--cta {
    display: none;
  }
}

/* ---------- BUTTONS ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: 0.75rem 1.5rem;
  font-size: var(--font-size-sm);
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition);
  cursor: pointer;
}

.btn--primary {
  background-color: var(--accent);
  color: #ffffff;
  border: 2px solid var(--accent);
}

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

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

.btn--outline:hover {
  background-color: var(--accent);
  color: #ffffff;
}

/* Small button variant */
.btn--sm {
  padding: 0.5rem 1rem;
  font-size: var(--font-size-sm);
}

/* Button icon */
.btn__icon {
  font-weight: 700;
  font-style: normal;
}

/* ---------- TAGS ---------- */
.tag {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  font-size: var(--font-size-sm);
  font-weight: 500;
  background-color: var(--bg-alt);
  color: var(--text-muted);
  border-radius: var(--radius-full);
}

/* ---------- HERO SECTION ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--header-height);
  background-color: var(--bg);
}

.hero__container {
  display: grid;
  gap: var(--spacing-xl);
  align-items: center;
}

.hero__greeting {
  color: var(--accent);
  font-weight: 500;
  margin-bottom: var(--spacing-xs);
}

.hero__name {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--spacing-xs);
}

.hero__title {
  font-size: var(--font-size-lg);
  color: var(--text-muted);
  margin-bottom: var(--spacing-md);
}

.hero__bio {
  color: var(--text-muted);
  margin-bottom: var(--spacing-lg);
  max-width: 600px;
}

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.hero__image {
  display: flex;
  justify-content: center;
}

.hero__image-placeholder {
  width: 280px;
  height: 280px;
  border-radius: var(--radius-lg);
  background-color: var(--bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: var(--font-size-lg);
  border: 2px dashed var(--card-border);
}

/* Hero responsive */
@media (min-width: 768px) {
  .hero__container {
    grid-template-columns: 1fr 1fr;
  }
  
  .hero__name {
    font-size: calc(var(--font-size-4xl) * 1.25);
  }
}

/* Hero highlights - key metrics */
.hero__highlights {
  display: flex;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--card-border);
  grid-column: 1 / -1;
}

.highlight {
  text-align: center;
}

.highlight__number {
  display: block;
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--accent);
  line-height: 1.2;
}

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

@media (max-width: 500px) {
  .hero__highlights {
    flex-direction: column;
    gap: var(--spacing-sm);
    align-items: flex-start;
  }
  
  .highlight {
    display: flex;
    align-items: baseline;
    gap: var(--spacing-xs);
    text-align: left;
  }
  
  .highlight__number {
    font-size: var(--font-size-xl);
  }
}

/* Hero photo styling */
.hero__photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius-lg);
}

/* ---------- ABOUT SECTION ---------- */
.about {
  background-color: var(--bg-alt);
}

.about__content {
  max-width: 800px;
  margin: 0 auto;
}

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

.about__text {
  font-size: var(--font-size-lg);
  line-height: 1.8;
}

.about__toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--accent);
  font-weight: 600;
  font-size: var(--font-size-sm);
  padding: var(--spacing-xs) 0;
  margin-bottom: var(--spacing-md);
}

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

.about__toggle::after {
  content: '↓';
  transition: transform var(--transition);
}

.about__toggle.active::after {
  transform: rotate(180deg);
}

.about__full-story {
  display: none;
  padding: var(--spacing-md);
  background-color: var(--card);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--accent);
}

.about__full-story.active {
  display: block;
}

.about__full-story p {
  margin-bottom: var(--spacing-md);
}

.about__themes {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--card-border);
}

.about__themes-title {
  margin-bottom: var(--spacing-sm);
}

.about__themes-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

.about__themes-list li {
  padding: 0.5rem 1rem;
  background-color: var(--card);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  border: 1px solid var(--card-border);
}

/* ---------- EXPERIENCE SECTION ---------- */
.experience__grid {
  display: grid;
  gap: var(--spacing-xl);
}

@media (min-width: 768px) {
  .experience__grid {
    grid-template-columns: 1.2fr 1fr;
  }
}

.experience__subtitle {
  color: var(--accent);
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-xs);
  border-bottom: 2px solid var(--accent);
  display: inline-block;
}

.experience__card {
  background-color: var(--card);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  border: 1px solid var(--card-border);
  margin-bottom: var(--spacing-md);
}

.experience__header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-xs);
}

.experience__role {
  font-size: var(--font-size-lg);
  color: var(--text);
}

.experience__date {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  font-weight: 500;
}

.experience__company {
  color: var(--accent);
  font-weight: 500;
  margin-bottom: var(--spacing-sm);
}

.experience__description {
  color: var(--text-muted);
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-sm);
}

.experience__list {
  margin-bottom: var(--spacing-sm);
  padding-left: var(--spacing-md);
}

.experience__list li {
  position: relative;
  margin-bottom: var(--spacing-xs);
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

.experience__list li::before {
  content: '•';
  color: var(--accent);
  font-weight: bold;
  position: absolute;
  left: -1rem;
}

.experience__list--certs li::before {
  content: '✓';
}

.experience__stack {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

/* ---------- SKILLS SECTION ---------- */
.skills {
  background-color: var(--bg-alt);
}

.skills__grid {
  display: grid;
  gap: var(--spacing-lg);
}

@media (min-width: 640px) {
  .skills__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .skills__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.skills__category {
  background-color: var(--card);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  border: 1px solid var(--card-border);
}

.skills__category-title {
  color: var(--accent);
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-lg);
}

.skills__list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.skills__item {
  padding: var(--spacing-xs) 0;
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  border-bottom: 1px solid var(--card-border);
}

.skills__item:last-child {
  border-bottom: none;
}

/* ---------- PROJECTS SECTION ---------- */
.projects__grid {
  display: grid;
  gap: var(--spacing-lg);
}

@media (min-width: 640px) {
  .projects__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .projects__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.project__card {
  background-color: var(--card);
  border-radius: var(--radius-md);
  border: 1px solid var(--card-border);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
}

.project__card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.project__content {
  padding: var(--spacing-md);
}

.project__title {
  margin-bottom: var(--spacing-xs);
}

.project__company {
  color: var(--accent);
  font-size: var(--font-size-sm);
  font-weight: 500;
  margin-bottom: var(--spacing-sm);
}

.project__description {
  color: var(--text-muted);
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-md);
}

.project__metrics {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

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

.metric strong {
  color: var(--accent);
  font-size: var(--font-size-lg);
  display: block;
}

.project__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

.project__card--placeholder {
  border-style: dashed;
  opacity: 0.7;
}

/* ---------- JOURNEY TIMELINE ---------- */
.journey {
  background-color: var(--bg-alt);
}

.timeline {
  position: relative;
  max-width: 700px;
  margin: 0 auto;
  padding-left: var(--spacing-lg);
}

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

.timeline__item {
  position: relative;
  padding-bottom: var(--spacing-lg);
}

.timeline__item:last-child {
  padding-bottom: 0;
}

.timeline__marker {
  position: absolute;
  left: calc(-1 * var(--spacing-lg) - 6px);
  top: 4px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background-color: var(--accent);
  border: 3px solid var(--bg-alt);
}

.timeline__content {
  background-color: var(--card);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  border: 1px solid var(--card-border);
}

.timeline__date {
  display: inline-block;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--accent);
  margin-bottom: var(--spacing-xs);
}

.timeline__title {
  margin-bottom: var(--spacing-xs);
}

.timeline__text {
  color: var(--text-muted);
  font-size: var(--font-size-sm);
  margin-bottom: 0;
}

/* ---------- CONTACT SECTION ---------- */
.contact__content {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
}

.contact__info {
  display: grid;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

@media (min-width: 500px) {
  .contact__info {
    grid-template-columns: repeat(3, 1fr);
  }
}

.contact__item {
  padding: var(--spacing-md);
  background-color: var(--bg-alt);
  border-radius: var(--radius-md);
}

.contact__label {
  display: block;
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  margin-bottom: var(--spacing-xs);
}

.contact__link {
  font-weight: 500;
  word-break: break-word;
}

.contact__text {
  font-weight: 500;
  color: var(--text);
}

.contact__links {
  display: flex;
  justify-content: center;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

/* ---------- FOOTER ---------- */
.footer {
  background-color: var(--bg-alt);
  padding: var(--spacing-lg) 0;
  border-top: 1px solid var(--card-border);
}

.footer .container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xs);
}

.footer__text {
  text-align: center;
  color: var(--text-muted);
  font-size: var(--font-size-sm);
}

.footer__credit {
  text-align: center;
  color: var(--text-muted);
  font-size: var(--font-size-sm);
  opacity: 0.7;
}

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

/* ============================================
   DARK THEME
   ============================================ */
[data-theme="dark"] {
  --bg: #0f172a;
  --bg-alt: #1e293b;
  --text: #f1f5f9;
  --text-muted: #94a3b8;
  --accent: #60a5fa;
  --accent-light: #93c5fd;
  --accent-hover: #3b82f6;
  --accent-subtle: rgba(96, 165, 250, 0.15);
  --card: #1e293b;
  --card-border: #334155;
  --header-bg: rgba(15, 23, 42, 0.92);
  --shadow-color: rgba(0, 0, 0, 0.3);
  --gradient-start: #1e293b;
  --gradient-end: #0f172a;
}

/* Dark theme specific adjustments */
[data-theme="dark"] .hero__image-placeholder {
  background-color: var(--bg-alt);
  border-color: var(--card-border);
}

[data-theme="dark"] .theme-toggle__icon::before {
  content: '🌙';
}

[data-theme="dark"] .tag {
  background-color: var(--accent-subtle);
  color: var(--accent-light);
}

[data-theme="dark"] .about__themes-list li {
  background-color: var(--card);
  border-color: var(--card-border);
}

[data-theme="dark"] .timeline__marker {
  border-color: var(--bg-alt);
}

/* ============================================
   ENHANCED VISUAL POLISH
   ============================================ */

/* Gradient backgrounds for visual interest */
.hero {
  background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
}

/* Enhanced card shadows and hover states */
.experience__card,
.skills__category,
.project__card,
.timeline__content {
  box-shadow: 0 1px 3px var(--shadow-color);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.experience__card:hover,
.skills__category:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 12px var(--shadow-color);
}

/* Enhanced button styles */
.btn {
  box-shadow: 0 2px 4px var(--shadow-color);
  position: relative;
  overflow: hidden;
}

.btn--primary {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-hover) 100%);
  border-color: transparent;
}

.btn--primary:hover {
  background: linear-gradient(135deg, var(--accent-hover) 0%, var(--accent) 100%);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow-color);
}

.btn--outline:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow-color);
}

/* Navigation link underline animation */
.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--accent);
  transition: width var(--transition);
}

.nav__link:hover::after {
  width: 100%;
}

/* Enhanced tags */
.tag {
  transition: background-color var(--transition), color var(--transition), transform var(--transition);
}

.tag:hover {
  background-color: var(--accent-subtle);
  color: var(--accent);
  transform: translateY(-1px);
}

/* Section title decoration */
.section__title::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-light));
  margin: var(--spacing-sm) auto 0;
  border-radius: var(--radius-full);
}

/* Enhanced experience subtitle */
.experience__subtitle {
  background: linear-gradient(90deg, var(--accent), var(--accent-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  border-bottom: none;
  position: relative;
}

.experience__subtitle::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), transparent);
}

/* Enhanced skills category title */
.skills__category-title {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.skills__category-title::before {
  content: '';
  width: 4px;
  height: 1.2em;
  background: linear-gradient(180deg, var(--accent), var(--accent-light));
  border-radius: var(--radius-full);
}

/* Project card hover enhancement */
.project__card:hover {
  border-color: var(--accent);
}

.project__card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-light));
  opacity: 0;
  transition: opacity var(--transition);
}

.project__card:hover::before {
  opacity: 1;
}

.project__card {
  position: relative;
}

/* Metric highlight */
.metric strong {
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Timeline enhancements */
.timeline::before {
  background: linear-gradient(180deg, var(--accent), var(--card-border));
}

.timeline__marker {
  box-shadow: 0 0 0 4px var(--accent-subtle);
}

.timeline__item:hover .timeline__marker {
  transform: scale(1.2);
  box-shadow: 0 0 0 6px var(--accent-subtle);
}

.timeline__marker {
  transition: transform var(--transition), box-shadow var(--transition);
}

.timeline__content:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 12px var(--shadow-color);
}

/* Contact item hover */
.contact__item {
  transition: transform var(--transition), box-shadow var(--transition);
  border: 1px solid transparent;
}

.contact__item:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow-color);
  border-color: var(--accent);
}

/* Hero image placeholder enhancement */
.hero__image-placeholder {
  background: linear-gradient(135deg, var(--bg-alt) 0%, var(--card-border) 100%);
  transition: transform var(--transition), box-shadow var(--transition);
}

.hero__image-placeholder:hover {
  transform: scale(1.02);
  box-shadow: 0 8px 24px var(--shadow-color);
}

/* About toggle button enhancement */
.about__toggle {
  background-color: var(--accent-subtle);
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-md);
  transition: background-color var(--transition), transform var(--transition);
}

.about__toggle:hover {
  background-color: var(--accent);
  color: #ffffff;
  transform: translateY(-1px);
}

.about__toggle:hover::after {
  color: #ffffff;
}

/* Full story panel enhancement */
.about__full-story {
  border-left-width: 4px;
  box-shadow: 0 2px 8px var(--shadow-color);
}

/* Theme toggle button enhancement */
.theme-toggle {
  border: 2px solid var(--card-border);
  transition: border-color var(--transition), transform var(--transition), background-color var(--transition);
}

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

/* Smooth theme transition */
html {
  transition: background-color 0.4s ease, color 0.4s ease;
}

body,
.header,
.nav__menu,
.experience__card,
.skills__category,
.project__card,
.timeline__content,
.contact__item,
.about__full-story,
.about__themes-list li {
  transition: background-color 0.4s ease, border-color 0.4s ease, color 0.4s ease, box-shadow 0.4s ease;
}

/* Focus states for accessibility */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.btn:focus-visible {
  outline-offset: 4px;
}

/* Selection color */
::selection {
  background-color: var(--accent);
  color: #ffffff;
}

/* ============================================
   SCROLL REVEAL ANIMATIONS
   ============================================ */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* Staggered delays for timeline items */
.timeline__item.reveal:nth-child(1) { transition-delay: 0.1s; }
.timeline__item.reveal:nth-child(2) { transition-delay: 0.2s; }
.timeline__item.reveal:nth-child(3) { transition-delay: 0.3s; }
.timeline__item.reveal:nth-child(4) { transition-delay: 0.4s; }
.timeline__item.reveal:nth-child(5) { transition-delay: 0.5s; }
.timeline__item.reveal:nth-child(6) { transition-delay: 0.6s; }

/* Staggered delays for cards */
.experience__card.reveal:nth-child(1) { transition-delay: 0.1s; }
.experience__card.reveal:nth-child(2) { transition-delay: 0.2s; }
.experience__card.reveal:nth-child(3) { transition-delay: 0.3s; }

.skills__category.reveal:nth-child(1) { transition-delay: 0.1s; }
.skills__category.reveal:nth-child(2) { transition-delay: 0.2s; }
.skills__category.reveal:nth-child(3) { transition-delay: 0.3s; }

.project__card.reveal:nth-child(1) { transition-delay: 0.1s; }
.project__card.reveal:nth-child(2) { transition-delay: 0.2s; }
.project__card.reveal:nth-child(3) { transition-delay: 0.3s; }

/* ============================================
   HEADER SCROLL STATE
   ============================================ */
.header.scrolled {
  box-shadow: 0 2px 20px var(--shadow-color);
}

/* ============================================
   ACTIVE NAV LINK
   ============================================ */
.nav__link.active {
  color: var(--accent);
}

.nav__link.active::after {
  width: 100%;
}

/* ============================================
   HAMBURGER MENU ANIMATION
   ============================================ */
.nav__toggle.active .hamburger {
  background-color: transparent;
}

.nav__toggle.active .hamburger::before {
  top: 0;
  transform: rotate(45deg);
}

.nav__toggle.active .hamburger::after {
  top: 0;
  transform: rotate(-45deg);
}

/* ============================================
   REDUCED MOTION PREFERENCE
   ============================================ */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  
  .reveal {
    opacity: 1;
    transform: none;
  }
}

/* ============================================
   PRINT STYLES
   ============================================ */
@media print {
  .header,
  .theme-toggle,
  .nav__toggle,
  .hero__cta,
  .about__toggle,
  .contact__links .btn {
    display: none !important;
  }
  
  .section {
    padding: 1rem 0;
    page-break-inside: avoid;
  }
  
  body {
    font-size: 12pt;
    line-height: 1.4;
    color: #000;
    background: #fff;
  }
  
  a {
    color: #000;
    text-decoration: underline;
  }
  
  .hero {
    min-height: auto;
    padding-top: 0;
  }
  
  .about__full-story {
    display: block !important;
  }
}

/* ============================================
   EXTRA SMALL SCREENS (< 360px)
   ============================================ */
@media (max-width: 359px) {
  :root {
    --font-size-4xl: 2rem;
    --font-size-3xl: 1.5rem;
    --container-padding: 1rem;
  }
  
  .hero__name {
    font-size: 1.75rem;
  }
  
  .btn {
    padding: 0.6rem 1rem;
    font-size: 0.8rem;
  }
}

/* ============================================
   LARGE SCREENS (> 1200px)
   ============================================ */
@media (min-width: 1200px) {
  :root {
    --container-max: 1200px;
  }
  
  .hero__bio {
    font-size: var(--font-size-lg);
  }
  
  .about__text {
    font-size: 1.2rem;
  }
}