/* ============================================================
   shenhonglei.com - Multi-Theme Design System
   Supports: dark (default) | light | custom
   ============================================================ */

/* ---------- Theme Variables ---------- */

/* DARK (default) */
:root,
[data-theme="dark"] {
  --canvas: #0a0a0f;
  --canvas-gradient: radial-gradient(ellipse at 50% 0%, rgba(94, 106, 210, 0.08) 0%, transparent 60%);
  --surface-1: #131318;
  --surface-2: #1a1a22;
  --surface-3: #22222c;
  --surface-4: #2a2a36;
  --hairline: #2e2e3a;
  --hairline-strong: #3e3e4e;
  --primary: #5e6ad2;
  --primary-hover: #828fff;
  --primary-focus: #5e69d1;
  --primary-soft: rgba(94, 106, 210, 0.12);
  --ink: #f0f0f5;
  --ink-muted: #b0b0c0;
  --ink-subtle: #7a7a8a;
  --ink-tertiary: #555565;
  --success: #27a644;
  --warning: #d4a017;
  --error: #e53e3e;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
  --shadow-md: 0 8px 24px rgba(0,0,0,0.4);
  --shadow-lg: 0 16px 48px rgba(0,0,0,0.5);
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-pill: 9999px;
}

/* LIGHT */
[data-theme="light"] {
  --canvas: #f8f9fa;
  --canvas-gradient: radial-gradient(ellipse at 50% 0%, rgba(94, 106, 210, 0.04) 0%, transparent 60%);
  --surface-1: #ffffff;
  --surface-2: #f1f3f5;
  --surface-3: #e9ecef;
  --surface-4: #dee2e6;
  --hairline: #e0e0e6;
  --hairline-strong: #d0d0d8;
  --primary: #4f5bc4;
  --primary-hover: #3d48a8;
  --primary-focus: #4a55b8;
  --primary-soft: rgba(79, 91, 196, 0.08);
  --ink: #1a1a2e;
  --ink-muted: #4a4a5e;
  --ink-subtle: #7a7a8e;
  --ink-tertiary: #a0a0b0;
  --success: #2b8a3e;
  --warning: #c4840e;
  --error: #c92a2a;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
  --shadow-lg: 0 16px 48px rgba(0,0,0,0.1);
}

/* CUSTOM (purple-cyan gradient vibe) */
[data-theme="custom"] {
  --canvas: #0d0d1a;
  --canvas-gradient: radial-gradient(ellipse at 30% 20%, rgba(120, 60, 200, 0.12) 0%, transparent 50%),
                     radial-gradient(ellipse at 70% 80%, rgba(60, 180, 200, 0.1) 0%, transparent 50%);
  --surface-1: #151528;
  --surface-2: #1e1e38;
  --surface-3: #282848;
  --surface-4: #323258;
  --hairline: #3a3a60;
  --hairline-strong: #4a4a70;
  --primary: #a855f7;
  --primary-hover: #c084fc;
  --primary-focus: #9333ea;
  --primary-soft: rgba(168, 85, 247, 0.15);
  --ink: #f0eaff;
  --ink-muted: #c4b5e0;
  --ink-subtle: #9080b0;
  --ink-tertiary: #605080;
  --success: #22c55e;
  --warning: #eab308;
  --error: #ef4444;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.4);
  --shadow-md: 0 8px 24px rgba(0,0,0,0.5);
  --shadow-lg: 0 16px 48px rgba(0,0,0,0.6);
}

/* ---------- Global ---------- */
html, body {
  background-color: var(--canvas) !important;
  color: var(--ink) !important;
  font-family: 'Inter', -apple-system, system-ui, 'Segoe UI', Roboto, sans-serif !important;
  transition: background-color 0.3s ease, color 0.3s ease;
}

body {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: var(--primary); transition: color 0.2s ease; }
a:hover { color: var(--primary-hover); text-decoration: none; }

/* ---------- Navigation ---------- */
.navigation {
  background: rgba(10, 10, 15, 0.85) !important;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--hairline);
  transition: background 0.3s;
}
[data-theme="light"] .navigation {
  background: rgba(248, 249, 250, 0.9) !important;
}
.navigation .navbar { background: transparent !important; }
.navigation .navbar-nav > li > a {
  color: var(--ink-muted) !important;
  font-weight: 500;
  font-size: 14px;
  transition: color 0.2s;
}
.navigation .navbar-nav > li > a:hover,
.navigation .navbar-nav > li > a:focus {
  color: var(--ink) !important;
  background: transparent !important;
}
.navbar-toggle { border-color: var(--hairline); }
.navbar-toggle .icon-bar { background-color: var(--ink-muted); }
.dropdown-menu {
  background: var(--surface-2) !important;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
}
.dropdown-menu > li > a { color: var(--ink-muted) !important; }
.dropdown-menu > li > a:hover {
  background: var(--surface-3) !important;
  color: var(--ink) !important;
}

/* Theme Toggle Button */
.theme-toggle-btn {
  display: inline-flex !important;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  padding: 0 !important;
  border-radius: var(--radius-md);
  border: 1px solid var(--hairline) !important;
  color: var(--ink-muted) !important;
  background: var(--surface-1) !important;
  transition: all 0.2s ease;
}
.theme-toggle-btn:hover {
  color: var(--ink) !important;
  border-color: var(--hairline-strong) !important;
  background: var(--surface-2) !important;
}

/* ---------- Hero / Banner ---------- */
.hero-banner {
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: center;
  background: var(--canvas);
  overflow: hidden;
  padding: 120px 0 80px;
}
.hero-banner::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: var(--canvas-gradient);
  pointer-events: none;
}
.hero-content {
  position: relative;
  z-index: 2;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: var(--primary-soft);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-pill);
  font-size: 13px;
  font-weight: 500;
  color: var(--primary);
  margin-bottom: 24px;
}
.hero-title {
  font-size: 56px;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -2px;
  color: var(--ink);
  margin-bottom: 12px;
}
.hero-subtitle {
  font-size: 22px;
  font-weight: 500;
  color: var(--primary);
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}
.hero-desc {
  font-size: 17px;
  line-height: 1.7;
  color: var(--ink-muted);
  max-width: 560px;
  margin-bottom: 32px;
}
.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 32px;
}
.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  background: var(--surface-1);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-pill);
  font-size: 12px;
  font-weight: 500;
  color: var(--ink-subtle);
}
.hero-tag i { font-size: 14px; color: var(--primary); }
.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.hero-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 600;
  transition: all 0.2s ease;
}
.hero-btn-primary {
  background: var(--primary);
  color: #fff !important;
  box-shadow: 0 4px 12px rgba(94, 106, 210, 0.25);
}
.hero-btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(94, 106, 210, 0.35);
}
.hero-btn-secondary {
  background: var(--surface-1);
  color: var(--ink) !important;
  border: 1px solid var(--hairline);
}
.hero-btn-secondary:hover {
  background: var(--surface-2);
  border-color: var(--hairline-strong);
}

/* Hero Canvas Animation */
.hero-canvas {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  z-index: 0;
  opacity: 0.4;
}

/* ---------- Section Common ---------- */
.section-dark { background: var(--canvas); }
.section-surface { background: var(--surface-1); border-top: 1px solid var(--hairline); border-bottom: 1px solid var(--hairline); }
.section-header {
  text-align: center;
  margin-bottom: 64px;
}
.section-header h2 {
  font-size: 36px;
  font-weight: 700;
  letter-spacing: -1px;
  color: var(--ink);
  margin-bottom: 12px;
}
.section-header p {
  font-size: 17px;
  color: var(--ink-subtle);
  max-width: 600px;
  margin: 0 auto;
}

/* ---------- Skills Grid ---------- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}
.skill-card {
  background: var(--surface-1);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}
.skill-card:hover {
  border-color: var(--hairline-strong);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.skill-card i {
  font-size: 32px;
  color: var(--primary);
  margin-bottom: 16px;
  display: block;
}
.skill-card h4 {
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 8px;
}
.skill-card p {
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink-subtle);
  margin: 0;
}

/* ---------- Experience / Industries ---------- */
.industry-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}
.industry-card {
  background: var(--surface-1);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  text-align: center;
  transition: all 0.2s;
}
.industry-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
}
.industry-card h4 {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 10px;
}
.industry-card p {
  font-size: 14px;
  color: var(--ink-subtle);
  line-height: 1.6;
  margin: 0;
}

/* ---------- Certifications ---------- */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}
.cert-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 20px;
  background: var(--surface-1);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  transition: all 0.2s;
}
.cert-item:hover {
  border-color: var(--primary);
}
.cert-icon {
  width: 40px;
  height: 40px;
  min-width: 40px;
  border-radius: var(--radius-md);
  background: var(--primary-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: var(--primary);
}
.cert-text h5 {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 4px;
}
.cert-text p {
  font-size: 13px;
  color: var(--ink-subtle);
  margin: 0;
}

/* ---------- Stats ---------- */
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 24px;
}
.stat-card {
  text-align: center;
  padding: 32px 20px;
  background: var(--surface-1);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  transition: all 0.2s;
}
.stat-card:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
}
.stat-card i {
  font-size: 36px;
  color: var(--primary);
  margin-bottom: 12px;
  display: block;
}
.stat-number {
  font-size: 32px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -1px;
  margin-bottom: 4px;
}
.stat-label {
  font-size: 14px;
  color: var(--ink-subtle);
}

/* ---------- GitHub Repos Section ---------- */
.github-repos-section {
  padding: 80px 0;
}
.repo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 16px;
}
.repo-card {
  background: var(--surface-1);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: 22px;
  transition: all 0.2s;
  display: flex;
  flex-direction: column;
  height: 100%;
}
.repo-card:hover {
  border-color: var(--hairline-strong);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}
.repo-card-header {
  display: flex;
  align-items: center;
  margin-bottom: 10px;
}
.repo-icon {
  width: 32px; height: 32px;
  background: var(--surface-2);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-right: 12px;
  flex-shrink: 0;
}
.repo-icon svg { width: 18px; height: 18px; fill: var(--ink-muted); }
.repo-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.repo-name a { color: var(--ink); text-decoration: none; }
.repo-name a:hover { color: var(--primary-hover); }
.repo-desc {
  font-size: 13px;
  line-height: 1.55;
  color: var(--ink-subtle);
  margin-bottom: 14px;
  flex-grow: 1;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.repo-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 12px;
  color: var(--ink-tertiary);
}
.repo-meta span { display: inline-flex; align-items: center; gap: 4px; }
.repo-lang-dot { width: 8px; height: 8px; border-radius: 50%; display: inline-block; }

/* ---------- CTA ---------- */
.cta-section {
  background: var(--surface-1);
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  padding: 80px 0;
  text-align: center;
}
.cta-section h2 {
  font-size: 32px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 12px;
}
.cta-section p {
  font-size: 17px;
  color: var(--ink-muted);
  max-width: 520px;
  margin: 0 auto 28px;
}

/* ---------- Footer ---------- */
.footer {
  background: var(--canvas) !important;
  border-top: 1px solid var(--hairline);
  padding: 40px 0;
}
.footer p,
.footer a { color: var(--ink-subtle) !important; }
.footer a:hover { color: var(--ink) !important; }

/* ---------- Buttons Override ---------- */
.btn-main {
  background: var(--primary) !important;
  color: #fff !important;
  border: none !important;
  border-radius: var(--radius-md) !important;
  padding: 10px 20px !important;
  font-weight: 600;
  font-size: 14px;
  transition: all 0.2s;
}
.btn-main:hover {
  background: var(--primary-hover) !important;
  transform: translateY(-1px);
}

/* ---------- Auth ---------- */
.auth-user-menu { display: inline-flex !important; align-items: center; }
.auth-user-email { color: var(--primary); font-weight: 500; font-size: 13px; margin-right: 12px; }
.auth-logout-btn {
  color: var(--error) !important;
  font-size: 13px;
  padding: 4px 10px;
  border: 1px solid var(--error);
  border-radius: var(--radius-sm);
  transition: all 0.2s;
}
.auth-logout-btn:hover { background: var(--error); color: #fff !important; }
.auth-login-btn, .auth-register-btn {
  font-size: 13px; padding: 5px 14px; border-radius: var(--radius-sm);
  transition: all 0.2s; font-weight: 500;
}
.auth-login-btn {
  color: var(--ink-muted) !important; border: 1px solid var(--hairline); margin-right: 8px;
}
.auth-login-btn:hover { background: var(--surface-2); color: var(--ink) !important; border-color: var(--hairline-strong); }
.auth-register-btn { background: var(--primary); color: #fff !important; border: 1px solid var(--primary); }
.auth-register-btn:hover { background: var(--primary-hover); }

/* ---------- Login Page ---------- */
.login-page {
  min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  position: relative; overflow: hidden;
  background: var(--canvas);
}
.login-canvas {
  position: absolute; top: 0; left: 0;
  width: 100%; height: 100%; z-index: 0;
}
.login-glow {
  position: absolute;
  width: 600px; height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(94, 106, 210, 0.12) 0%, transparent 70%);
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  z-index: 1;
  animation: pulse-glow 6s ease-in-out infinite;
}
@keyframes pulse-glow {
  0%, 100% { opacity: 0.6; transform: translate(-50%, -50%) scale(1); }
  50% { opacity: 1; transform: translate(-50%, -50%) scale(1.15); }
}
.login-container {
  position: relative; z-index: 2;
  width: 100%; max-width: 420px; padding: 0 20px;
}
.login-box {
  background: rgba(19, 19, 24, 0.9);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-xl);
  padding: 44px 36px;
  box-shadow: var(--shadow-lg);
}
[data-theme="light"] .login-box {
  background: rgba(255, 255, 255, 0.95);
}
.login-box h2 {
  font-size: 26px; font-weight: 700;
  color: var(--ink); text-align: center;
  margin-bottom: 6px; letter-spacing: -0.5px;
}
.login-box .auth-subtitle {
  text-align: center; color: var(--ink-subtle);
  margin-bottom: 28px; font-size: 14px;
}
.login-box .form-group { margin-bottom: 16px; }
.login-box label {
  display: block; margin-bottom: 5px;
  font-size: 13px; font-weight: 500; color: var(--ink-muted);
}
.login-box input {
  width: 100%; padding: 11px 14px;
  background: var(--surface-2);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  color: var(--ink);
  font-size: 15px;
  transition: border-color 0.2s, box-shadow 0.2s;
  box-sizing: border-box;
}
.login-box input::placeholder { color: var(--ink-tertiary); }
.login-box input:focus {
  outline: none;
  border-color: var(--primary-focus);
  box-shadow: 0 0 0 3px var(--primary-soft);
}
.login-box .btn-auth {
  width: 100%; padding: 13px;
  border: none; border-radius: var(--radius-md);
  font-size: 15px; font-weight: 600;
  cursor: pointer; transition: all 0.2s;
  margin-top: 8px;
}
.login-box .btn-auth-primary {
  background: var(--primary); color: #fff;
}
.login-box .btn-auth-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
}
.login-box .auth-error { color: var(--error); font-size: 13px; margin-top: 6px; display: none; }
.login-box .auth-error.show { display: block; }
.login-box .auth-success { color: var(--success); font-size: 13px; margin-top: 6px; display: none; }
.login-box .auth-success.show { display: block; }
.login-box .auth-footer {
  text-align: center; margin-top: 20px;
  font-size: 14px; color: var(--ink-subtle);
}
.login-box .auth-footer a { color: var(--primary); font-weight: 500; }
.login-box .auth-footer a:hover { color: var(--primary-hover); }

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .hero-title { font-size: 36px; letter-spacing: -1px; }
  .hero-subtitle { font-size: 18px; }
  .section-header h2 { font-size: 28px; }
  .skills-grid, .repo-grid { grid-template-columns: 1fr; }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .login-box { padding: 32px 24px; }
}

/* ---------- Content Override Fixes ---------- */
section { background-color: transparent !important; }
.about { background: transparent !important; }
.about .block p { color: var(--ink-muted) !important; }
.about .block .section-title h2 { color: var(--ink) !important; }
.testimonial { background: var(--surface-1) !important; border-top: 1px solid var(--hairline); }
.testimonial .section-title h2 { color: var(--ink) !important; }
.counter-item i { color: var(--primary) !important; }
.counter-item h4 { color: var(--ink) !important; }
.counter-item span { color: var(--ink-subtle) !important; }
.page-title { background: var(--surface-1) !important; border-bottom: 1px solid var(--hairline); }
.page-title h1 { color: var(--ink) !important; }
.widget { background: var(--surface-1); border: 1px solid var(--hairline); border-radius: var(--radius-lg); padding: 24px; }
.widget h2 { color: var(--ink) !important; font-size: 16px; font-weight: 600; }
.post { background: var(--surface-1); border: 1px solid var(--hairline); border-radius: var(--radius-lg); overflow: hidden; }
.post .post-title a { color: var(--ink) !important; }
.post p { color: var(--ink-muted) !important; }