/* ============================================
   Abdelrahman Seif — Portfolio Styles
   ============================================ */

:root {
  --bg: #0B0F17;
  --bg-alt: #0F1420;
  --surface: rgba(255, 255, 255, 0.04);
  --surface-hover: rgba(255, 255, 255, 0.07);
  --border: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(99, 102, 241, 0.35);
  --text: #E8ECF4;
  --text-muted: #94A3B8;
  --text-subtle: #64748B;
  --primary: #6366F1;
  --primary-soft: #818CF8;
  --secondary: #60A5FA;
  --glow: rgba(99, 102, 241, 0.25);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  --radius: 18px;
  --radius-sm: 12px;
  --font-display: 'Sora', 'Inter', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;
  --nav-height: 72px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --container: min(1140px, calc(100% - 2.5rem));
}

[data-theme="light"] {
  --bg: #F4F6FB;
  --bg-alt: #EEF1F8;
  --surface: rgba(255, 255, 255, 0.75);
  --surface-hover: rgba(255, 255, 255, 0.95);
  --border: rgba(15, 23, 42, 0.08);
  --border-glow: rgba(99, 102, 241, 0.25);
  --text: #0F172A;
  --text-muted: #475569;
  --text-subtle: #64748B;
  --glow: rgba(99, 102, 241, 0.12);
  --shadow: 0 8px 32px rgba(15, 23, 42, 0.08);
}

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

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

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
  transition: background var(--transition), color var(--transition);
}

body.menu-open {
  overflow: hidden;
}

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

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

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

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 3px;
}

.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;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 9999;
  padding: 0.75rem 1.25rem;
  background: var(--primary);
  color: #fff;
  border-radius: var(--radius-sm);
  font-weight: 600;
}

.skip-link:focus {
  top: 1rem;
}

.container {
  width: var(--container);
  margin-inline: auto;
}

/* ========== Navbar ========== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  background: transparent;
  transition: background var(--transition), backdrop-filter var(--transition), box-shadow var(--transition);
}

.navbar.scrolled {
  background: rgba(11, 15, 23, 0.75);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow);
}

[data-theme="light"] .navbar.scrolled {
  background: rgba(244, 246, 251, 0.85);
}

.navbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 1.5rem;
}

.navbar__logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--text);
  font-family: var(--font-display);
  font-weight: 600;
  flex-shrink: 0;
}

.navbar__logo-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  font-size: 0.85rem;
  font-weight: 700;
}

.navbar__logo-text {
  font-size: 1rem;
}

.navbar__nav {
  flex: 1;
  display: flex;
  justify-content: center;
}

.navbar__links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
}

.nav-link {
  padding: 0.5rem 0.85rem;
  border-radius: 10px;
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition), background var(--transition);
}

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

.nav-link.active {
  box-shadow: inset 0 0 0 1px var(--border-glow);
}

.navbar__actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

.icon-btn {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
}

.icon-btn:hover {
  background: var(--surface-hover);
  border-color: var(--border-glow);
}

.icon-btn:active {
  transform: scale(0.96);
}

#langLabel {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}

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

.navbar__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  cursor: pointer;
  padding: 8px;
}

.navbar__toggle span {
  display: block;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.navbar__toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.navbar__toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.navbar__toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ========== Sections ========== */
.section {
  padding: 6rem 0;
  position: relative;
}

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

.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 3.5rem;
}

.section-label {
  display: inline-block;
  padding: 0.35rem 0.9rem;
  margin-bottom: 1rem;
  border-radius: 999px;
  border: 1px solid var(--border-glow);
  background: var(--glow);
  color: var(--primary-soft);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
}

.section-desc {
  color: var(--text-muted);
  font-size: 1.05rem;
}

/* ========== Glass Card ========== */
.glass-card {
  padding: 1.75rem;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.glass-card:hover {
  border-color: var(--border-glow);
  transform: translateY(-2px);
}

/* ========== Buttons ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.6rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

.btn:active {
  transform: scale(0.98);
}

.btn--primary {
  background: linear-gradient(135deg, var(--primary), #4F46E5);
  color: #fff;
  box-shadow: 0 4px 20px var(--glow);
}

.btn--primary:hover {
  box-shadow: 0 6px 28px rgba(99, 102, 241, 0.45);
  color: #fff;
}

.btn--ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn--ghost:hover {
  border-color: var(--border-glow);
  background: var(--surface);
  color: var(--text);
}

.btn--full {
  width: 100%;
}

.btn--sm {
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
}

/* ========== Cover ========== */
.cover {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-height);
  overflow: hidden;
  position: relative;
}

.cover__particles {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  opacity: 0.6;
}

.cover__blobs {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.35;
  animation: float 12s ease-in-out infinite;
}

.blob--1 {
  width: 400px;
  height: 400px;
  background: var(--primary);
  top: 10%;
  left: -5%;
}

.blob--2 {
  width: 350px;
  height: 350px;
  background: var(--secondary);
  bottom: 10%;
  right: -5%;
  animation-delay: -4s;
}

.blob--3 {
  width: 250px;
  height: 250px;
  background: #8B5CF6;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  animation-delay: -8s;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(30px, -30px) scale(1.05); }
  66% { transform: translate(-20px, 20px) scale(0.95); }
}

.cover__grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 4rem;
  align-items: center;
  position: relative;
  z-index: 1;
  padding-block: 4rem;
}

.cover__avatar-wrap {
  display: flex;
  justify-content: center;
  position: relative;
}

.cover__avatar-glow {
  position: absolute;
  width: 280px;
  height: 280px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--glow) 0%, transparent 70%);
  animation: pulse-glow 4s ease-in-out infinite;
}

@keyframes pulse-glow {
  0%, 100% { opacity: 0.6; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.08); }
}

.cover__avatar {
  width: 240px;
  height: 240px;
  border-radius: 50%;
  border: 2px solid var(--border-glow);
  background: linear-gradient(145deg, rgba(99, 102, 241, 0.15), rgba(96, 165, 250, 0.08));
  display: grid;
  place-items: center;
  color: var(--primary-soft);
  box-shadow: 0 0 60px var(--glow), inset 0 0 40px rgba(99, 102, 241, 0.08);
  position: relative;
  z-index: 1;
}

.cover__avatar svg {
  width: 120px;
  height: 120px;
}

.cover__greeting {
  color: var(--primary-soft);
  font-weight: 500;
  margin-bottom: 0.5rem;
  font-size: 1.05rem;
}

.cover__name {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 0.5rem;
  background: linear-gradient(135deg, var(--text) 30%, var(--primary-soft));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.cover__role {
  font-size: 1.25rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.cover__typing {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
  min-height: 1.75rem;
}

.typing-text {
  color: var(--secondary);
  font-weight: 600;
}

.typing-cursor {
  color: var(--primary);
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

.cover__tagline {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 520px;
  margin-bottom: 2rem;
}

.cover__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2rem;
}

.cover__social {
  display: flex;
  gap: 1rem;
}

.cover__social a {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  transition: color var(--transition), border-color var(--transition), transform var(--transition);
}

.cover__social a:hover {
  color: var(--primary-soft);
  border-color: var(--border-glow);
  transform: translateY(-2px);
}

.scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-subtle);
  font-size: 0.8rem;
  z-index: 1;
  animation: bounce 2s ease-in-out infinite;
}

.scroll-indicator__mouse {
  width: 22px;
  height: 34px;
  border: 2px solid var(--text-subtle);
  border-radius: 12px;
  position: relative;
}

.scroll-indicator__mouse::after {
  content: '';
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 8px;
  background: var(--primary-soft);
  border-radius: 4px;
  animation: scroll-dot 2s ease-in-out infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(6px); }
}

@keyframes scroll-dot {
  0% { opacity: 1; top: 6px; }
  100% { opacity: 0; top: 16px; }
}

/* ========== About ========== */
.about__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.about__grid p {
  color: var(--text-muted);
  font-size: 1rem;
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.stat {
  text-align: center;
  padding: 2rem 1rem;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
}

.stat__number {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary-soft);
}

.stat__suffix {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary-soft);
}

.stat__label {
  display: block;
  margin-top: 0.5rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* ========== Services ========== */
.services__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.service-card {
  padding: 2rem;
}

.service-card__icon {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: var(--glow);
  color: var(--primary-soft);
  margin-bottom: 1.25rem;
  border: 1px solid var(--border-glow);
}

.service-card__title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.service-card__desc {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* ========== Resume ========== */
.resume__grid {
  display: flex;
  flex-direction: column;
  gap: 3rem;
}

.resume__block-title {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  padding-inline-start: 0.75rem;
  border-inline-start: 3px solid var(--primary);
}

.resume__cards {
  display: grid;
  gap: 1rem;
}

.resume-card__header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.resume-card__title {
  font-weight: 600;
  font-size: 1.05rem;
}

.resume-card__meta {
  color: var(--text-subtle);
  font-size: 0.85rem;
}

.resume-card__org {
  color: var(--primary-soft);
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.resume-card__desc {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.resume-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.tag {
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  background: var(--glow);
  border: 1px solid var(--border-glow);
  color: var(--primary-soft);
  font-size: 0.78rem;
  font-weight: 500;
}

.skills__wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.skill-pill {
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.9rem;
  transition: border-color var(--transition), color var(--transition);
}

.skill-pill:hover {
  border-color: var(--border-glow);
  color: var(--text);
}

/* ========== Contact ========== */
.contact__grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 2rem;
  align-items: start;
}

.contact__info {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.contact__item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.contact__item svg {
  flex-shrink: 0;
  color: var(--primary-soft);
  margin-top: 0.15rem;
}

.contact__label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-subtle);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
}

.contact__item a,
.contact__item span:last-child {
  color: var(--text);
  font-weight: 500;
}

.contact__social {
  display: flex;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.contact__social-link {
  flex: 1;
  text-align: center;
  padding: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.9rem;
}

.contact__social-link:hover {
  color: var(--primary-soft);
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.85rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.15);
  color: var(--text);
  font-family: inherit;
  font-size: 0.95rem;
  transition: border-color var(--transition);
  resize: vertical;
}

[data-theme="light"] .form-group input,
[data-theme="light"] .form-group textarea {
  background: rgba(255, 255, 255, 0.6);
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--primary);
  outline: none;
}

.form-group input.error,
.form-group textarea.error {
  border-color: #EF4444;
}

.form-status {
  margin-top: 1rem;
  font-size: 0.9rem;
  text-align: center;
  min-height: 1.4rem;
}

.form-status.success { color: #34D399; }
.form-status.error { color: #F87171; }

/* ========== Footer ========== */
.footer {
  padding: 2rem 0;
  border-top: 1px solid var(--border);
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.footer__copy {
  color: var(--text-subtle);
  font-size: 0.9rem;
}

.footer__social {
  display: flex;
  gap: 0.75rem;
}

.footer__social a {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  border: 1px solid var(--border);
  color: var(--text-muted);
  transition: color var(--transition), border-color var(--transition);
}

.footer__social a:hover {
  color: var(--primary-soft);
  border-color: var(--border-glow);
}

.back-to-top {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity var(--transition), visibility var(--transition), transform var(--transition), border-color var(--transition);
}

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

.back-to-top:hover {
  border-color: var(--border-glow);
}

/* ========== Reveal Animations ========== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  filter: blur(4px);
  transition: opacity 0.7s ease, transform 0.7s ease, filter 0.7s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
  filter: blur(0);
}

.reveal--delay-1 { transition-delay: 0.1s; }
.reveal--delay-2 { transition-delay: 0.2s; }
.reveal--delay-3 { transition-delay: 0.3s; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { transition: opacity 0.3s ease; filter: none; transform: none; }
  .blob, .scroll-indicator, .typing-cursor, .cover__avatar-glow { animation: none; }
}

/* ========== RTL ========== */
[dir="rtl"] .navbar__inner { flex-direction: row-reverse; }
[dir="rtl"] .navbar__links { flex-direction: row-reverse; }
[dir="rtl"] .cover__grid { direction: rtl; }
[dir="rtl"] .resume__block-title { border-inline-start: none; border-inline-end: 3px solid var(--primary); padding-inline-start: 0; padding-inline-end: 0.75rem; }

/* ========== Responsive ========== */
@media (max-width: 1024px) {
  .cover__grid {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 2.5rem;
  }

  .cover__tagline { margin-inline: auto; }
  .cover__actions { justify-content: center; }
  .cover__social { justify-content: center; }

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

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

@media (max-width: 768px) {
  .navbar__toggle { display: flex; }

  .navbar__nav {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(11, 15, 23, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    justify-content: flex-start;
    padding: 2rem;
    transform: translateX(100%);
    transition: transform var(--transition);
    z-index: 999;
  }

  [data-theme="light"] .navbar__nav {
    background: rgba(244, 246, 251, 0.97);
  }

  [dir="rtl"] .navbar__nav {
    transform: translateX(-100%);
  }

  .navbar__nav.open {
    transform: translateX(0);
  }

  .navbar__links {
    flex-direction: column;
    width: 100%;
    gap: 0.25rem;
  }

  .nav-link {
    display: block;
    width: 100%;
    padding: 1rem;
    font-size: 1.05rem;
  }

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

  .footer__inner {
    flex-direction: column;
    text-align: center;
  }

  .cover__avatar {
    width: 200px;
    height: 200px;
  }

  .cover__avatar-glow {
    width: 240px;
    height: 240px;
  }
}

@media (max-width: 480px) {
  .section { padding: 4rem 0; }
  .cover__actions { flex-direction: column; }
  .cover__actions .btn { width: 100%; }
  .contact__social { flex-direction: column; }
}