/* ==========================================================================
   tahaderouiche.com — Style
   Single-file CSS: variables, reset, layout, components, responsive
   ========================================================================== */

/* ---------- Design Tokens ---------- */
:root {
  /* Colors — Apple-inspired palette */
  --color-primary: #007AFF;
  --color-primary-hover: #0066d6;
  --color-text: #1d1d1f;
  --color-text-secondary: #86868b;
  --color-bg: #ffffff;
  --color-bg-secondary: #f5f5f7;
  --color-border: #d2d2d7;
  --color-surface: #ffffff;
  --color-hero-bg: #f5f5f7;
  --color-footer-bg: #1d1d1f;
  --color-footer-text: #f5f5f7;
  --color-success: #00cd98;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Inter', 'SF Pro Display', system-ui, sans-serif;
  --font-size-base: 1rem;
  --line-height: 1.7;

  /* Spacing */
  --section-padding: clamp(3rem, 8vw, 6rem);
  --container-max: 960px;
  --container-padding: 1.5rem;

  /* Effects */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
  --transition: 0.3s ease;
}

/* ---------- Dark Mode ---------- */
@media (prefers-color-scheme: dark) {
  :root {
    --color-text: #f5f5f7;
    --color-text-secondary: #a1a1a6;
    --color-bg: #1d1d1f;
    --color-bg-secondary: #2c2c2e;
    --color-border: #3a3a3c;
    --color-surface: #2c2c2e;
    --color-hero-bg: #1d1d1f;
    --color-footer-bg: #000000;
    --color-footer-text: #f5f5f7;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.3);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.4);
  }
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

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

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

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

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

ul, ol {
  list-style: none;
}

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

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

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

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

/* ---------- Typography ---------- */
h1, h2, h3, h4 {
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  margin-bottom: 2rem;
  color: var(--color-text);
}

/* ---------- Navigation ---------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  will-change: backdrop-filter;
}

@media (prefers-color-scheme: dark) {
  .nav {
    background: rgba(29,29,31,0.8);
  }
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.nav__logo {
  font-weight: 600;
  font-size: 1rem;
  color: var(--color-text);
  text-decoration: none;
}

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

.nav__links {
  display: none;
  gap: 2rem;
}

.nav__links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--transition);
}

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

.nav__toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: none;
  background: none;
  cursor: pointer;
  border-radius: var(--radius-sm);
  color: var(--color-text);
}

.nav__toggle:hover {
  background: var(--color-bg-secondary);
}

.nav__toggle svg {
  width: 24px;
  height: 24px;
  fill: currentColor;
}

.nav__cta {
  display: none;
  padding: 0.5rem 1.25rem;
  background: var(--color-primary);
  color: #fff;
  border-radius: 980px;
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  transition: background var(--transition), opacity var(--transition);
}

.nav__cta:hover {
  background: var(--color-primary-hover);
  color: #fff;
}

/* Mobile menu */
.nav__mobile {
  display: none;
  flex-direction: column;
  padding: 1rem var(--container-padding) 1.5rem;
  border-top: 1px solid var(--color-border);
  background: var(--color-bg);
}

.nav__mobile.is-open {
  display: flex;
}

.nav__mobile a {
  padding: 0.75rem 0;
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text);
  border-bottom: 1px solid var(--color-border);
}

.nav__mobile a:last-child {
  border-bottom: none;
}

@media (min-width: 768px) {
  .nav__links {
    display: flex;
  }
  .nav__cta {
    display: inline-block;
  }
  .nav__toggle {
    display: none;
  }
}

/* ---------- Hero ---------- */
.hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: calc(56px + 5rem) var(--container-padding) 5rem;
  background: var(--color-hero-bg);
}

.hero__avatar {
  width: 220px;
  height: 220px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 2.5rem;
  box-shadow:
    0 0 0 6px var(--color-hero-bg),
    0 0 0 9px #11998e,
    0 12px 40px rgba(0,0,0,0.1);
}

.hero__name {
  font-size: clamp(2.5rem, 7vw, 4.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 0.75rem;
}

.hero__title {
  font-size: clamp(1.0625rem, 2.5vw, 1.5rem);
  font-weight: 400;
  color: var(--color-text-secondary);
  margin-bottom: 2rem;
}

.hero__intro {
  max-width: 560px;
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

/* ---------- About ---------- */
.about__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: center;
}

.about__text p {
  color: var(--color-text-secondary);
  font-size: 1.0625rem;
  line-height: 1.8;
  margin-bottom: 1rem;
}

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

.about__image {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.about__image img {
  width: 100%;
  display: block;
}

@media (min-width: 768px) {
  .about__grid {
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
  }
}

/* ---------- Work Experience ---------- */
.work {
  background: var(--color-bg-secondary);
}

.work__layout {
  display: flex;
  flex-direction: column;
  gap: 0;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  overflow: hidden;
}

.work__tabs {
  display: flex;
  flex-direction: column;
  border-bottom: 1px solid var(--color-border);
}

.work__tab {
  padding: 1rem 1.5rem;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  background: none;
  border: none;
  border-left: 3px solid transparent;
  cursor: pointer;
  text-align: left;
  transition: all var(--transition);
}

.work__tab:not(:last-child) {
  border-bottom: 1px solid var(--color-border);
}

.work__tab:hover {
  background: var(--color-bg-secondary);
  color: var(--color-text);
}

.work__tab.is-active {
  color: var(--color-primary);
  border-left-color: var(--color-primary);
  background: var(--color-bg);
}

.work__panels {
  padding: 1.5rem;
}

.work__panel {
  display: none;
}

.work__panel.is-active {
  display: block;
}

.work__role {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.375rem;
  color: var(--color-text);
}

.work__company {
  font-size: 1rem;
  color: var(--color-text-secondary);
  margin-bottom: 0.25rem;
}

.work__date {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  font-weight: 500;
}

.work__blurb {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  font-style: italic;
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--color-border);
}

@media (min-width: 768px) {
  .work__layout {
    flex-direction: row;
  }
  .work__tabs {
    flex: 0 0 220px;
    border-bottom: none;
    border-right: 1px solid var(--color-border);
  }
  .work__tab:not(:last-child) {
    border-bottom: 1px solid var(--color-border);
  }
  .work__panels {
    flex: 1;
    padding: 2rem;
    display: flex;
    align-items: center;
  }
}

/* ---------- Education Timeline ---------- */
.timeline {
  position: relative;
  max-width: 700px;
  margin: 0 auto;
  padding-left: 2.5rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--color-border);
}

.timeline__item {
  position: relative;
  padding-bottom: 2.5rem;
}

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

.timeline__dot {
  position: absolute;
  left: -2.5rem;
  top: 4px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-primary);
  border: 3px solid var(--color-bg);
  box-shadow: 0 0 0 2px var(--color-primary);
}

.timeline__content {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  transition: box-shadow var(--transition);
}

.timeline__content:hover {
  box-shadow: var(--shadow-md);
}

.timeline__title {
  font-size: 1.0625rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.timeline__school {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  margin-bottom: 0.25rem;
}

.timeline__school a {
  color: var(--color-primary);
}

.timeline__date {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-secondary);
}

.timeline__end {
  text-align: center;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
  margin-top: 2rem;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

/* ---------- Links / Social ---------- */
.links {
  background: var(--color-bg-secondary);
}

.links__row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
}

.links__btn {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0.75rem 1.5rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 980px;
  font-weight: 500;
  font-size: 0.9375rem;
  color: var(--color-text);
  text-decoration: none;
  transition: all var(--transition);
}

.links__btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  box-shadow: var(--shadow-sm);
  transform: translateY(-2px);
}

.links__btn svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

/* ---------- Contact ---------- */
.contact__form {
  max-width: 640px;
  margin: 0 auto;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-bottom: 1rem;
}

@media (min-width: 480px) {
  .form-row--half {
    grid-template-columns: 1fr 1fr;
  }
}

.form-group {
  position: relative;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: 0.375rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0,122,255,0.15);
}

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

.form-submit {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 2rem;
  margin-top: 0.5rem;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: 980px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
}

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

.form-success {
  display: none;
  padding: 1rem 1.5rem;
  margin-top: 1.5rem;
  background: rgba(0,205,152,0.1);
  border: 1px solid var(--color-success);
  border-radius: var(--radius-sm);
  color: var(--color-success);
  font-weight: 500;
  text-align: center;
}

/* ---------- Footer ---------- */
.footer {
  background: var(--color-footer-bg);
  color: var(--color-footer-text);
  padding: 3rem 0;
}

.footer__inner {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  text-align: center;
}

.footer__text {
  font-size: 0.9375rem;
  line-height: 1.7;
}

.footer__text a {
  color: var(--color-primary);
}

.footer__meta {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
}

@media (min-width: 768px) {
  .footer__inner {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    text-align: left;
  }
}

/* ---------- Scroll Animations ---------- */
.fade-up {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-up.is-visible {
  opacity: 1;
  transform: translateY(0);
}

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

.text-center {
  text-align: center;
}