/* ============================================
   RIDHO NUR ROFIQ — Portfolio Landing Page
   Cloudflare Pages Optimized
   ============================================ */

/* ----- CSS Variables ----- */
:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #111118;
  --bg-card: #16161f;
  --bg-card-hover: #1c1c28;
  --text-primary: #f0f0f5;
  --text-secondary: #a0a0b8;
  --text-muted: #6b6b80;
  --accent: #6c5ce7;
  --accent-light: #a29bfe;
  --accent-glow: rgba(108, 92, 231, 0.15);
  --border: #1e1e2e;
  --border-light: #2a2a3e;
  --gradient-1: linear-gradient(135deg, #6c5ce7, #a29bfe);
  --gradient-2: linear-gradient(135deg, #6c5ce7, #00cec9);
  --gradient-3: linear-gradient(135deg, #fd79a8, #6c5ce7);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --max-width: 1200px;
  --nav-height: 72px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

/* ----- Container ----- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ----- Navigation ----- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  transition: var(--transition);
}

.navbar.scrolled {
  background: rgba(10, 10, 15, 0.95);
  border-bottom-color: var(--border-light);
}

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

.nav-logo {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  background: var(--gradient-1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-1);
  transition: var(--transition);
  border-radius: 1px;
}

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

.nav-link:hover::after {
  width: 100%;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

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

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

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

/* ----- Buttons ----- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
}

.btn-primary {
  background: var(--gradient-1);
  color: #fff;
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(108, 92, 231, 0.3);
}

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

.btn-outline:hover {
  border-color: var(--accent);
  background: var(--accent-glow);
  transform: translateY(-2px);
}

/* ----- Section Shared ----- */
.section {
  padding: 100px 0;
  border-bottom: 1px solid var(--border);
}

.section-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 48px;
}

.section-number {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  opacity: 0.7;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

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

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(108, 92, 231, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

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

.hero-badge {
  display: inline-block;
  padding: 6px 16px;
  background: var(--accent-glow);
  border: 1px solid rgba(108, 92, 231, 0.3);
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--accent-light);
  margin-bottom: 20px;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}

.gradient-text {
  background: var(--gradient-1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-roles {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.role-tag {
  padding: 4px 12px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

.hero-description {
  font-size: 1.15rem;
  color: var(--text-primary);
  line-height: 1.7;
  margin-bottom: 12px;
  max-width: 540px;
}

.hero-sub {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 20px;
  max-width: 500px;
}

.hero-location {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 32px;
}

.hero-location svg {
  color: var(--accent);
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ----- Architecture Diagram ----- */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.architecture-diagram {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 32px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  position: relative;
  width: 100%;
  max-width: 360px;
}

.arch-node {
  padding: 10px 20px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  text-align: center;
  transition: var(--transition);
  width: 100%;
}

.arch-root {
  background: linear-gradient(135deg, rgba(108, 92, 231, 0.2), rgba(0, 206, 201, 0.1));
  border-color: rgba(108, 92, 231, 0.4);
  color: var(--accent-light);
  font-weight: 700;
  font-size: 0.95rem;
}

.arch-child {
  width: 100%;
}

.arch-leaf {
  width: 100%;
  font-size: 0.8rem;
  padding: 8px 16px;
}

.arch-db {
  border-style: dashed;
}

.arch-line {
  width: 2px;
  height: 20px;
  background: var(--border-light);
}

.arch-line-v {
  width: 2px;
  height: 16px;
}

.arch-branch {
  display: flex;
  gap: 12px;
  width: 100%;
}

.arch-branch-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 8px;
}

.arch-caption {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-align: center;
  margin-top: 8px;
  font-style: italic;
}

/* ===== ABOUT ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
  align-items: start;
}

.about-heading {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.about-text {
  color: var(--text-secondary);
  margin-bottom: 16px;
  font-size: 1rem;
  line-height: 1.7;
}

.about-stats {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.stat-card {
  padding: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.stat-card:hover {
  border-color: var(--border-light);
  background: var(--bg-card-hover);
}

.stat-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

.stat-value {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.stat-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag {
  padding: 4px 10px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* ===== EXPERTISE ===== */
.expertise-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.expertise-card {
  padding: 28px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.expertise-card:hover {
  border-color: var(--border-light);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
}

.expertise-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-glow);
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  color: var(--accent-light);
}

.expertise-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.expertise-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.expertise-skills {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.skill-tag {
  padding: 3px 10px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* ===== PROJECTS ===== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.project-card {
  padding: 28px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.project-card:hover {
  border-color: var(--border-light);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
}

.project-card-header {
  margin-bottom: 12px;
}

.project-badge {
  display: inline-block;
  padding: 3px 10px;
  background: var(--accent-glow);
  border: 1px solid rgba(108, 92, 231, 0.2);
  border-radius: 100px;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--accent-light);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 8px;
}

.project-title {
  font-size: 1.15rem;
  font-weight: 700;
}

.project-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.6;
}

.project-highlights {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.highlight-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.highlight-item svg {
  color: var(--accent);
  flex-shrink: 0;
}

/* ===== EXPERIENCE ===== */
.experience-card {
  padding: 32px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.exp-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 12px;
}

.exp-title-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.exp-role {
  font-size: 1.3rem;
  font-weight: 700;
}

.exp-company {
  font-size: 0.9rem;
  color: var(--accent-light);
}

.exp-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.exp-location {
  display: flex;
  align-items: center;
  gap: 4px;
}

.exp-location svg {
  color: var(--accent);
}

.exp-date {
  padding: 4px 12px;
  background: var(--accent-glow);
  border: 1px solid rgba(108, 92, 231, 0.2);
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--accent-light);
}

.exp-responsibilities {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

.exp-responsibilities li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.exp-responsibilities li::before {
  content: '▹';
  color: var(--accent);
  font-size: 0.85rem;
}

/* ===== PHILOSOPHY ===== */
.philosophy {
  text-align: center;
}

.philosophy-content {
  max-width: 720px;
  margin: 0 auto;
}

.philosophy-quote {
  margin-bottom: 32px;
  position: relative;
}

.quote-mark {
  font-size: 4rem;
  line-height: 1;
  color: var(--accent);
  opacity: 0.3;
  display: block;
  margin-bottom: -16px;
}

.quote-text {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -0.02em;
}

.philosophy-body {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

.philosophy-emphasis {
  color: var(--accent-light);
  font-weight: 600;
  font-size: 1.1rem;
}

/* ===== RESEARCH ===== */
.research-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.research-card {
  padding: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: var(--transition);
  text-align: center;
}

.research-card:hover {
  border-color: var(--border-light);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
}

.research-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-glow);
  border-radius: var(--radius-sm);
  margin: 0 auto 12px;
  color: var(--accent-light);
}

.research-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.research-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ===== TECH STACK ===== */
.techstack-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.tech-category {
  padding: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.tech-category:hover {
  border-color: var(--border-light);
}

.tech-category-title {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.tech-items {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tech-item {
  padding: 6px 14px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  transition: var(--transition);
}

.tech-item:hover {
  border-color: var(--accent);
  color: var(--accent-light);
  background: var(--accent-glow);
}

/* ===== VISION ===== */
.vision-content {
  max-width: 720px;
}

.vision-text {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 20px;
}

/* ===== CONTACT ===== */
.contact-content {
  text-align: center;
  max-width: 500px;
  margin: 0 auto;
}

.contact-heading {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 32px;
  letter-spacing: -0.02em;
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 24px;
}

.contact-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
}

.contact-link:hover {
  border-color: var(--accent);
  color: var(--text-primary);
  background: var(--accent-glow);
  transform: translateY(-2px);
}

.contact-location {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.contact-location svg {
  color: var(--accent);
}

/* ===== FOOTER ===== */
.footer {
  padding: 48px 0;
  text-align: center;
}

.footer-content {
  max-width: 500px;
  margin: 0 auto;
}

.footer-name {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 8px;
  background: var(--gradient-1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.footer-role {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.footer-tagline {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-style: italic;
  margin-bottom: 24px;
}

.footer-divider {
  width: 60px;
  height: 2px;
  background: var(--gradient-1);
  margin: 0 auto 16px;
  border-radius: 1px;
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--text-muted);
}

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

/* Tablet */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero-visual {
    order: -1;
  }

  .architecture-diagram {
    max-width: 300px;
  }

  .hero-title {
    font-size: 2.8rem;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

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

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

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

/* Mobile */
@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(10, 10, 15, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
    border-bottom: 1px solid var(--border);
  }

  .nav-links.active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  .nav-toggle {
    display: flex;
  }

  .hero-title {
    font-size: 2.2rem;
  }

  .hero-description {
    font-size: 1rem;
  }

  .section {
    padding: 64px 0;
  }

  .section-title {
    font-size: 1.5rem;
  }

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

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

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

  .exp-responsibilities {
    grid-template-columns: 1fr;
  }

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

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

  .contact-links {
    flex-direction: column;
    align-items: center;
  }

  .hero-buttons {
    flex-direction: column;
  }

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

/* Small Mobile */
@media (max-width: 480px) {
  .hero-title {
    font-size: 1.8rem;
  }

  .container {
    padding: 0 16px;
  }

  .architecture-diagram {
    padding: 20px 16px;
  }

  .arch-branch-3 {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   ANIMATIONS
   ============================================ */

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-content {
  animation: fadeInUp 0.8s ease-out;
}

.hero-visual {
  animation: fadeInUp 0.8s ease-out 0.2s both;
}

/* Scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

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

/* Glow pulse for arch-root */
.arch-root {
  animation: glowPulse 3s ease-in-out infinite;
}

@keyframes glowPulse {
  0%, 100% {
    box-shadow: 0 0 10px rgba(108, 92, 231, 0.1);
  }
  50% {
    box-shadow: 0 0 20px rgba(108, 92, 231, 0.25);
  }
}