/* ============================================
   DAwithRK - Simple Portfolio Website
   Pure CSS - No Framework
   ============================================ */

/* Variables */
:root {
  --primary: #0071e3;
  --primary-hover: #0077ed;
  --text: #1d1d1f;
  --text-secondary: #86868b;
  --bg: #ffffff;
  --bg-secondary: #f5f5f7;
  --border: #d2d2d7;
  --font: 'Lexend', -apple-system, BlinkMacSystemFont, sans-serif;
  --radius: 12px;
  --shadow: 0 4px 20px rgba(0,0,0,0.08);
}

[data-theme="dark"] {
  --text: #f5f5f7;
  --text-secondary: #a1a1a6;
  --bg: #000000;
  --bg-secondary: #1d1d1f;
  --border: #424245;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
}

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

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

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

/* Container */
.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 24px;
}

.container-wide {
  max-width: 1200px;
}

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

h1 { font-size: clamp(2.5rem, 6vw, 3.5rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.25rem); }
h3 { font-size: 1.25rem; }

/* ============================================
   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(--border);
}

[data-theme="dark"] .nav {
  background: rgba(0,0,0,0.8);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.logo {
  font-size: 1.375rem;
  font-weight: 600;
  color: var(--text);
}

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

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  color: var(--text);
  font-size: 15px;
  opacity: 0.85;
  transition: opacity 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  opacity: 1;
  color: var(--primary);
}

.theme-toggle {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 50%;
  width: 36px;
  height: 36px;
  cursor: pointer;
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

/* Mobile Nav */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text);
  margin: 5px 0;
}

@media (max-width: 768px) {
  .nav-toggle { display: block; }
  
  .nav-links {
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg);
    padding: 24px;
    gap: 16px;
    border-bottom: 1px solid var(--border);
    display: none;
  }
  
  .nav-links.active { display: flex; }
}

/* ============================================
   Animations
   ============================================ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-10px);
  }
}

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 80px;
}

.hero-content {
  max-width: 700px;
  animation: fadeInUp 0.8s ease-out;
}

.hero-eyebrow {
  color: var(--primary);
  font-weight: 500;
  margin-bottom: 16px;
  animation: fadeIn 0.6s ease-out;
}

.hero h1 {
  margin-bottom: 24px;
  animation: fadeInUp 0.8s ease-out 0.2s backwards;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 40px;
  animation: fadeInUp 0.8s ease-out 0.4s backwards;
}

.hero-image {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  margin: 0 auto 32px;
  object-fit: cover;
  border: 4px solid var(--primary);
  box-shadow: 0 8px 24px rgba(0, 113, 227, 0.2);
  animation: fadeIn 1s ease-out, float 3s ease-in-out infinite;
}

.hero-image-placeholder {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  margin: 0 auto 32px;
  background: linear-gradient(135deg, var(--primary), var(--primary-hover));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  color: white;
  border: 4px solid var(--primary);
  box-shadow: 0 8px 24px rgba(0, 113, 227, 0.2);
  animation: fadeIn 1s ease-out, float 3s ease-in-out infinite;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  font-size: 16px;
  font-weight: 500;
  border-radius: 980px;
  cursor: pointer;
  transition: all 0.3s ease;
  border: none;
  font-family: var(--font);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

.btn-primary {
  background: var(--primary);
  color: white;
}

.btn-primary:hover {
  background: var(--primary-hover);
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0, 113, 227, 0.3);
}

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

.btn-secondary:hover {
  background: var(--primary);
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0, 113, 227, 0.3);
}

.btn-group {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease-out 0.6s backwards;
}

/* ============================================
   Sections
   ============================================ */
.section {
  padding: 100px 0;
}

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

.section-header {
  text-align: center;
  margin-bottom: 60px;
  animation: fadeInUp 0.8s ease-out;
}

.section-header h2 {
  margin-bottom: 16px;
  animation: fadeInUp 0.8s ease-out 0.1s backwards;
}

.section-header p {
  color: var(--text-secondary);
  font-size: 1.125rem;
  animation: fadeInUp 0.8s ease-out 0.2s backwards;
}

/* ============================================
   Cards Grid
   ============================================ */
.grid {
  display: grid;
  gap: 24px;
}

.grid-2 { grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }

/* Project Card */
.card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.4s ease, box-shadow 0.4s ease, border-color 0.3s ease;
  animation: fadeInUp 0.6s ease-out backwards;
}

.card:nth-child(1) { animation-delay: 0.1s; }
.card:nth-child(2) { animation-delay: 0.2s; }
.card:nth-child(3) { animation-delay: 0.3s; }
.card:nth-child(4) { animation-delay: 0.4s; }
.card:nth-child(5) { animation-delay: 0.5s; }
.card:nth-child(6) { animation-delay: 0.6s; }

.card:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: 0 12px 40px rgba(0, 113, 227, 0.15);
  border-color: var(--primary);
}

.card-image {
  width: 100%;
  aspect-ratio: 16/10;
  object-fit: cover;
  background: var(--bg-secondary);
  transition: transform 0.4s ease;
}

.card:hover .card-image {
  transform: scale(1.05);
}

.card-image-placeholder {
  width: 100%;
  aspect-ratio: 16/10;
  background: linear-gradient(135deg, var(--bg-secondary), var(--border));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
}

.card-body {
  padding: 24px;
}

.card-body h3 {
  margin-bottom: 8px;
}

.card-body h3 a {
  color: var(--text);
}

.card-body h3 a:hover {
  color: var(--primary);
}

.card-body p {
  color: var(--text-secondary);
  font-size: 15px;
  margin-bottom: 16px;
}

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

.tag {
  font-size: 12px;
  padding: 4px 12px;
  background: var(--bg-secondary);
  border-radius: 980px;
  color: var(--text-secondary);
}

/* Blog Card */
.blog-meta {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

/* ============================================
   Portfolio Single Page
   ============================================ */
.page-header {
  padding: 120px 0 60px;
  text-align: center;
  background: var(--bg-secondary);
}

.page-header h1 {
  margin-bottom: 16px;
}

.page-header p {
  color: var(--text-secondary);
  font-size: 1.25rem;
  max-width: 700px;
  margin: 0 auto;
}

/* Embed Container */
.embed-container {
  margin: 40px 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
}

.embed-container iframe {
  width: 100%;
  height: 700px;
  border: none;
}

.embed-fullscreen {
  text-align: center;
  margin-top: 16px;
}

/* Content */
.content {
  max-width: 800px;
  margin: 0 auto;
  padding: 60px 24px;
}

.content h2 {
  margin: 48px 0 24px;
}

.content h3 {
  margin: 32px 0 16px;
}

.content p {
  margin-bottom: 16px;
}

.content ul, .content ol {
  margin: 16px 0;
  padding-left: 24px;
}

.content li {
  margin-bottom: 8px;
}

.content img {
  border-radius: var(--radius);
  margin: 24px 0;
}

.content pre {
  background: var(--bg-secondary);
  padding: 20px;
  border-radius: var(--radius);
  overflow-x: auto;
  margin: 24px 0;
}

.content code {
  font-family: 'SF Mono', monospace;
  font-size: 14px;
}

.content blockquote {
  border-left: 3px solid var(--primary);
  padding-left: 20px;
  margin: 24px 0;
  color: var(--text-secondary);
  font-style: italic;
}

.content table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
}

.content th, .content td {
  padding: 12px;
  border: 1px solid var(--border);
  text-align: left;
}

.content th {
  background: var(--bg-secondary);
  font-weight: 600;
}

/* Assets Links (PDF, PPT, etc) */
.assets-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 24px 0;
}

.asset-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px;
  background: var(--bg-secondary);
  border-radius: var(--radius);
  color: var(--text);
  transition: background 0.2s;
}

.asset-link:hover {
  background: var(--border);
  color: var(--text);
}

.asset-link .icon {
  font-size: 24px;
}

.asset-link .info {
  flex: 1;
}

.asset-link .info span {
  display: block;
  font-size: 13px;
  color: var(--text-secondary);
}

/* ============================================
   About Page
   ============================================ */
.about-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 60px;
  align-items: start;
}

@media (max-width: 768px) {
  .about-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
}

.about-image {
  width: 100%;
  aspect-ratio: 1;
  border-radius: 50%;
  object-fit: cover;
  background: var(--bg-secondary);
}

.about-image-placeholder {
  width: 100%;
  max-width: 280px;
  aspect-ratio: 1;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--bg-secondary), var(--border));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  color: var(--text-secondary);
  margin: 0 auto;
}

.skills-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
}

.skill-tag {
  padding: 8px 16px;
  background: var(--bg-secondary);
  border-radius: 980px;
  font-size: 14px;
  transition: all 0.3s ease;
  animation: fadeInUp 0.5s ease-out backwards;
}

.skill-tag:nth-child(1) { animation-delay: 0.1s; }
.skill-tag:nth-child(2) { animation-delay: 0.15s; }
.skill-tag:nth-child(3) { animation-delay: 0.2s; }
.skill-tag:nth-child(4) { animation-delay: 0.25s; }
.skill-tag:nth-child(5) { animation-delay: 0.3s; }
.skill-tag:nth-child(6) { animation-delay: 0.35s; }
.skill-tag:nth-child(7) { animation-delay: 0.4s; }
.skill-tag:nth-child(8) { animation-delay: 0.45s; }
.skill-tag:nth-child(9) { animation-delay: 0.5s; }
.skill-tag:nth-child(10) { animation-delay: 0.55s; }

.skill-tag:hover {
  background: var(--primary);
  color: white;
  transform: translateY(-3px) scale(1.05);
  box-shadow: 0 4px 12px rgba(0, 113, 227, 0.2);
}

/* ============================================
   Contact Page
   ============================================ */
.contact-form {
  max-width: 500px;
  margin: 0 auto 40px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 14px 16px;
  font-size: 16px;
  font-family: var(--font);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--text);
}

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

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

.contact-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 400px;
  margin: 0 auto;
}

.contact-link {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 16px;
  background: var(--bg-secondary);
  border-radius: var(--radius);
  color: var(--text);
}

.contact-link:hover {
  background: var(--border);
  color: var(--text);
}

/* ============================================
   Footer
   ============================================ */
.footer {
  padding: 40px 0;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  text-align: center;
}

.footer p {
  color: var(--text-secondary);
  font-size: 14px;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-top: 20px;
}

.footer-links a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
  font-size: 14px;
  padding: 8px 16px;
  border-radius: 8px;
  transition: all 0.3s ease;
}

.footer-links a:hover {
  color: var(--primary);
  background: var(--bg-secondary);
  transform: translateY(-2px);
}

.footer-links a svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

/* ============================================
   Blog List
   ============================================ */
.blog-list {
  max-width: 800px;
  margin: 0 auto;
}

.blog-item {
  padding: 32px 0;
  border-bottom: 1px solid var(--border);
}

.blog-item:last-child {
  border-bottom: none;
}

.blog-item h3 {
  margin-bottom: 8px;
}

.blog-item h3 a {
  color: var(--text);
}

.blog-item h3 a:hover {
  color: var(--primary);
}

.blog-item p {
  color: var(--text-secondary);
  margin-bottom: 12px;
}

/* ============================================
   Utilities
   ============================================ */
.text-center { text-align: center; }
.mt-40 { margin-top: 40px; }
.mb-40 { margin-bottom: 40px; }

/* ============================================
   Social Share Buttons
   ============================================ */
.share-section {
  margin: 40px 0;
  padding: 24px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.share-section h4 {
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

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

.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  transition: transform 0.2s, opacity 0.2s;
  border: none;
  cursor: pointer;
  font-family: var(--font);
}

.share-btn:hover {
  transform: translateY(-2px);
  opacity: 0.9;
  color: white;
}

.share-btn svg {
  width: 18px;
  height: 18px;
}

.share-btn.twitter {
  background: #000000;
  color: white;
}

.share-btn.linkedin {
  background: #0A66C2;
  color: white;
}

.share-btn.facebook {
  background: #1877F2;
  color: white;
}

.share-btn.whatsapp {
  background: #25D366;
  color: white;
}

.share-btn.copy {
  background: var(--bg-secondary);
  color: var(--text);
  border: 1px solid var(--border);
}

.share-btn.copy:hover {
  color: var(--text);
}

.share-btn.copy.copied {
  background: #34c759;
  color: white;
  border-color: #34c759;
}