/* =====================================================
   LEIN-TECH — Main Stylesheet
   Glassmorphism UI | Dark Mode | Responsive
   ===================================================== */

/* Google Fonts — Poppins */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700;800&display=swap');

/* =====================================================
   CSS Custom Properties
   ===================================================== */
:root {
  --bg:           #0f172a;
  --bg-alt:       #1e293b;
  --accent:       #38bdf8;
  --accent-dark:  #0ea5e9;
  --glass-bg:     rgba(255, 255, 255, 0.08);
  --glass-border: rgba(255, 255, 255, 0.2);
  --text:         #e2e8f0;
  --text-muted:   #94a3b8;
  --shadow:       0 8px 32px rgba(0, 0, 0, 0.4);
  --radius:       20px;
  --transition:   0.3s ease;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Poppins', sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
  min-height: 100vh;
}

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

a:hover {
  color: #fff;
}

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

ul {
  list-style: none;
}

button {
  cursor: pointer;
  font-family: 'Poppins', sans-serif;
  border: none;
  outline: none;
}

/* =====================================================
   Typography
   ===================================================== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  color: var(--text);
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.6rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.2rem, 3vw, 1.6rem); }

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

/* =====================================================
   Glass Component
   ===================================================== */
.glass {
  background: var(--glass-bg);
  border-radius: var(--radius);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}

.glass:hover {
  transform: translateY(-5px) scale(1.02);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.5), 0 0 20px rgba(56, 189, 248, 0.1);
}

/* =====================================================
   Layout Utilities
   ===================================================== */
.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
}

.section {
  padding: 80px 0;
}

.section-title {
  text-align: center;
  margin-bottom: 16px;
}

.section-subtitle {
  text-align: center;
  color: var(--text-muted);
  font-size: 1.05rem;
  margin-bottom: 56px;
}

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

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

/* =====================================================
   Buttons
   ===================================================== */
.btn {
  display: inline-block;
  padding: 12px 32px;
  border-radius: 50px;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  transition: all var(--transition);
  cursor: pointer;
  font-family: 'Poppins', sans-serif;
}

.btn-primary {
  background: var(--accent);
  color: #0f172a;
  border: 2px solid var(--accent);
  box-shadow: 0 0 20px rgba(56, 189, 248, 0.4);
}

.btn-primary:hover {
  background: transparent;
  color: var(--accent);
  box-shadow: 0 0 32px rgba(56, 189, 248, 0.7);
  transform: translateY(-2px);
}

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

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 0 20px rgba(56, 189, 248, 0.2);
}

.btn-sm {
  padding: 8px 22px;
  font-size: 0.85rem;
}

/* =====================================================
   Sticky Navbar
   ===================================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 16px 0;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--glass-border);
  transition: padding var(--transition), background var(--transition);
}

.navbar.scrolled {
  padding: 10px 0;
  background: rgba(15, 23, 42, 0.9);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
}

.nav-logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: 1px;
}

.nav-logo span {
  color: var(--accent);
}

.nav-links {
  display: flex;
  gap: 36px;
  align-items: center;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  position: relative;
  transition: color var(--transition);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}

.hamburger span {
  display: block;
  width: 26px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all var(--transition);
}

.hamburger.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger.open span:nth-child(2) {
  opacity: 0;
}

.hamburger.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile nav */
.nav-mobile {
  display: none;
  flex-direction: column;
  gap: 0;
  position: absolute;
  top: 100%;
  left: 0;
  width: 100%;
  background: rgba(15, 23, 42, 0.97);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid var(--glass-border);
  padding: 0;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
}

.nav-mobile.open {
  display: flex;
  max-height: 400px;
  padding: 16px 0;
}

.nav-mobile a {
  color: var(--text-muted);
  font-size: 1rem;
  font-weight: 500;
  padding: 14px 5%;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  transition: color var(--transition), background var(--transition);
}

.nav-mobile a:hover {
  color: var(--accent);
  background: rgba(56, 189, 248, 0.05);
}

/* =====================================================
   Hero Section
   ===================================================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding-top: 80px;
}

/* Animated background blobs */
.blob-container {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.35;
  animation: floatBlob linear infinite;
}

.blob-1 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, #0ea5e9, transparent 70%);
  top: -100px;
  left: -150px;
  animation-duration: 10s;
}

.blob-2 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, #6366f1, transparent 70%);
  bottom: -80px;
  right: -100px;
  animation-duration: 14s;
  animation-delay: -4s;
}

.blob-3 {
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, #38bdf8, transparent 70%);
  top: 40%;
  left: 55%;
  animation-duration: 12s;
  animation-delay: -7s;
}

@keyframes floatBlob {
  0%, 100% { transform: translateY(0px) scale(1); }
  33%       { transform: translateY(-30px) scale(1.05); }
  66%       { transform: translateY(20px) scale(0.97); }
}

@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50%       { transform: translateY(-20px); }
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 60px 40px;
  max-width: 760px;
  width: 90%;
}

.hero-badge {
  display: inline-block;
  background: rgba(56, 189, 248, 0.15);
  border: 1px solid rgba(56, 189, 248, 0.4);
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 2px;
  padding: 6px 18px;
  border-radius: 50px;
  margin-bottom: 20px;
  text-transform: uppercase;
}

.hero h1 {
  margin-bottom: 16px;
  background: linear-gradient(135deg, #e2e8f0 0%, #38bdf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-sub {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 36px;
  letter-spacing: 1px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* =====================================================
   Services Preview Cards
   ===================================================== */
.service-card {
  padding: 36px 28px;
  text-align: center;
}

.service-icon {
  font-size: 2.8rem;
  margin-bottom: 18px;
  display: block;
}

.service-card h3 {
  margin-bottom: 12px;
  font-size: 1.15rem;
}

.service-card p {
  font-size: 0.92rem;
  line-height: 1.6;
}

/* =====================================================
   Projects Cards
   ===================================================== */
.project-card {
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.project-card h3 {
  font-size: 1.1rem;
}

.project-card p {
  font-size: 0.9rem;
  flex: 1;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 4px;
}

.tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 600;
  background: rgba(56, 189, 248, 0.15);
  color: var(--accent);
  border: 1px solid rgba(56, 189, 248, 0.3);
}

/* =====================================================
   About Page
   ===================================================== */
.about-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.about-text h2 {
  margin-bottom: 20px;
}

.about-text p {
  margin-bottom: 16px;
}

.about-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.about-logo-card {
  padding: 60px 48px;
  text-align: center;
  font-size: 3.5rem;
  font-weight: 800;
  letter-spacing: 2px;
  color: var(--accent);
  position: relative;
}

.about-logo-card::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.3), rgba(99, 102, 241, 0.3));
  z-index: -1;
}

/* Skills grid */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.skill-card {
  padding: 28px 24px;
  text-align: center;
}

.skill-icon {
  font-size: 2.2rem;
  margin-bottom: 12px;
  display: block;
}

.skill-card h3 {
  font-size: 1rem;
  margin-bottom: 8px;
}

.skill-card p {
  font-size: 0.85rem;
}

/* Timeline */
.timeline {
  position: relative;
  padding-left: 32px;
}

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

.timeline-item {
  position: relative;
  padding: 28px 32px;
  margin-bottom: 24px;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -38px;
  top: 36px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent);
}

.timeline-year {
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 1px;
  margin-bottom: 8px;
}

.timeline-item h3 {
  font-size: 1.05rem;
  margin-bottom: 8px;
}

.timeline-item p {
  font-size: 0.88rem;
}

/* =====================================================
   Services Page
   ===================================================== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.service-full-card {
  padding: 44px 36px;
}

.service-full-card .service-icon {
  font-size: 3rem;
  text-align: left;
  margin-bottom: 20px;
}

.service-full-card h3 {
  font-size: 1.3rem;
  margin-bottom: 14px;
}

.service-full-card p {
  line-height: 1.8;
  font-size: 0.95rem;
}

.service-features {
  margin-top: 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* =====================================================
   Projects Page
   ===================================================== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

/* =====================================================
   Modal
   ===================================================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
  padding: 20px;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: all;
}

.modal-box {
  background: rgba(15, 23, 42, 0.95);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.6);
  max-width: 560px;
  width: 100%;
  padding: 40px 36px;
  position: relative;
  transform: scale(0.9);
  transition: transform var(--transition);
}

.modal-overlay.active .modal-box {
  transform: scale(1);
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 20px;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
  transition: color var(--transition);
  line-height: 1;
}

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

.modal-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
}

.modal-box h2 {
  font-size: 1.4rem;
  margin-bottom: 12px;
}

.modal-box p {
  margin-bottom: 16px;
  font-size: 0.93rem;
}

.modal-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

/* =====================================================
   Contact Page
   ===================================================== */
.contact-wrapper {
  display: grid;
  grid-template-columns: 1fr 1.6fr;
  gap: 48px;
  align-items: start;
}

.contact-info {
  padding: 40px 32px;
}

.contact-info h3 {
  margin-bottom: 16px;
}

.contact-info p {
  margin-bottom: 28px;
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.contact-detail-item {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-muted);
  font-size: 0.92rem;
}

.contact-detail-item span:first-child {
  font-size: 1.2rem;
}

.contact-form-card {
  padding: 44px 40px;
}

.contact-form-card h3 {
  margin-bottom: 28px;
}

.form-group {
  margin-bottom: 22px;
}

.form-group label {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 8px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.form-control {
  width: 100%;
  padding: 14px 18px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  color: var(--text);
  font-size: 0.95rem;
  font-family: 'Poppins', sans-serif;
  transition: border-color var(--transition), background var(--transition), box-shadow var(--transition);
  outline: none;
}

.form-control:focus {
  border-color: var(--accent);
  background: rgba(56, 189, 248, 0.06);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.12);
}

.form-control::placeholder {
  color: rgba(148, 163, 184, 0.5);
}

textarea.form-control {
  resize: vertical;
  min-height: 130px;
}

.form-message {
  margin-top: 16px;
  padding: 12px 18px;
  border-radius: 10px;
  font-size: 0.9rem;
  font-weight: 500;
  display: none;
}

.form-message.success {
  background: rgba(34, 197, 94, 0.15);
  border: 1px solid rgba(34, 197, 94, 0.4);
  color: #4ade80;
  display: block;
}

.form-message.error {
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(239, 68, 68, 0.4);
  color: #f87171;
  display: block;
}

/* =====================================================
   Footer
   ===================================================== */
.footer {
  background: rgba(255, 255, 255, 0.04);
  border-top: 1px solid var(--glass-border);
  padding: 48px 0 28px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand .nav-logo {
  font-size: 1.4rem;
  margin-bottom: 14px;
  display: block;
}

.footer-brand p {
  font-size: 0.88rem;
  max-width: 260px;
}

.footer-col h4 {
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text);
  margin-bottom: 16px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.88rem;
  transition: color var(--transition);
}

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

.footer-social {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.social-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--glass-border);
  transition: all var(--transition);
}

.social-link:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(56, 189, 248, 0.08);
  transform: translateY(-2px);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom p {
  font-size: 0.85rem;
}

/* =====================================================
   Fade-in Animation (Intersection Observer)
   ===================================================== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* Stagger delays */
.fade-in:nth-child(2) { transition-delay: 0.1s; }
.fade-in:nth-child(3) { transition-delay: 0.2s; }
.fade-in:nth-child(4) { transition-delay: 0.3s; }
.fade-in:nth-child(5) { transition-delay: 0.4s; }
.fade-in:nth-child(6) { transition-delay: 0.5s; }

/* =====================================================
   Page Header (inner pages)
   ===================================================== */
.page-header {
  padding: 140px 0 80px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-header h1 {
  margin-bottom: 12px;
}

.page-header p {
  font-size: 1.05rem;
  max-width: 500px;
  margin: 0 auto;
}

/* =====================================================
   Responsive — Tablet (≤ 900px)
   ===================================================== */
@media (max-width: 900px) {
  .grid-3,
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .about-visual {
    order: -1;
  }

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

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

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

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

/* =====================================================
   Responsive — Mobile (≤ 600px)
   ===================================================== */
@media (max-width: 600px) {
  .grid-3,
  .grid-2,
  .projects-grid,
  .services-grid,
  .skills-grid {
    grid-template-columns: 1fr;
  }

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

  .hero-content {
    padding: 40px 24px;
  }

  .nav-links {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .contact-form-card,
  .contact-info {
    padding: 28px 22px;
  }

  .footer-bottom {
    justify-content: center;
    text-align: center;
  }
}

/* =====================================================
   Scrollbar
   ===================================================== */
::-webkit-scrollbar {
  width: 6px;
}

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

::-webkit-scrollbar-thumb {
  background: rgba(56, 189, 248, 0.4);
  border-radius: 4px;
}

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