/* style.css - Design System for Personal Workspace Portal */

/* Base & Typography */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&display=swap');

:root {
  /* Color Palette - Light Mode (Default) */
  --bg-gradient: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 50%, #e2e8f0 100%);
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --accent-color: #4f46e5;
  --accent-secondary: #9333ea;
  --accent-gradient: linear-gradient(135deg, #4f46e5 0%, #9333ea 100%);
  
  --card-bg: rgba(255, 255, 255, 0.7);
  --card-border: rgba(0, 0, 0, 0.06);
  --card-border-hover: rgba(79, 70, 229, 0.3);
  --card-shadow: 0 4px 20px rgba(15, 23, 42, 0.05);
  --card-shadow-hover: 0 20px 25px -5px rgba(79, 70, 229, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  --input-bg: rgba(255, 255, 255, 0.9);
  --input-border: rgba(0, 0, 0, 0.08);
  --input-focus: #4f46e5;
  
  --tag-bg: rgba(0, 0, 0, 0.04);
  --tag-text: #475569;
  --tag-active-bg: linear-gradient(135deg, #4f46e5 0%, #9333ea 100%);
  --tag-active-text: #ffffff;
  
  --header-glow: radial-gradient(circle at 50% -20%, rgba(79, 70, 229, 0.08) 0%, transparent 60%);
  --theme-btn-bg: rgba(0, 0, 0, 0.03);
  --theme-btn-border: rgba(0, 0, 0, 0.08);
  
  --font-sans: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Microsoft YaHei", sans-serif;
  --transition-smooth: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  /* Color Palette - Dark Mode Override */
  --bg-gradient: linear-gradient(135deg, #0b0f19 0%, #111827 50%, #1e1b4b 100%);
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-color: #6366f1; /* Indigo */
  --accent-secondary: #a855f7; /* Purple */
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
  
  --card-bg: rgba(30, 41, 59, 0.45);
  --card-border: rgba(255, 255, 255, 0.08);
  --card-border-hover: rgba(99, 102, 241, 0.4);
  --card-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
  --card-shadow-hover: 0 20px 25px -5px rgba(99, 102, 241, 0.15), 0 10px 10px -5px rgba(0, 0, 0, 0.2);
  
  --input-bg: rgba(15, 23, 42, 0.6);
  --input-border: rgba(255, 255, 255, 0.1);
  --input-focus: #6366f1;
  
  --tag-bg: rgba(255, 255, 255, 0.06);
  --tag-text: #cbd5e1;
  --tag-active-bg: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
  --tag-active-text: #ffffff;
  
  --header-glow: radial-gradient(circle at 50% -20%, rgba(99, 102, 241, 0.15) 0%, transparent 70%);
  --theme-btn-bg: rgba(255, 255, 255, 0.05);
  --theme-btn-border: rgba(255, 255, 255, 0.1);
}

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

body {
  font-family: var(--font-sans);
  background: var(--bg-gradient);
  background-attachment: fixed;
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
  transition: background 0.5s ease, color 0.3s ease;
  line-height: 1.6;
}

/* Background Glow Effects */
body::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 500px;
  background: var(--header-glow);
  z-index: -1;
  pointer-events: none;
  transition: var(--transition-smooth);
}

/* Main Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 24px 60px;
  position: relative;
  z-index: 1;
}

/* Header & Navbar */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 50px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.brand-logo-svg {
  width: 24px;
  height: 24px;
  fill: currentColor;
}

.brand-info h1 {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-info p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 400;
}

/* Theme Toggle Button */
.theme-toggle-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--theme-btn-bg);
  border: 1px solid var(--theme-btn-border);
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-smooth);
  outline: none;
}

.theme-toggle-btn:hover {
  background: var(--accent-color);
  color: white;
  border-color: var(--accent-color);
  transform: rotate(15deg) scale(1.05);
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

.theme-toggle-btn svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* Theme Icons Toggle */
[data-theme="dark"] .sun-icon {
  display: block;
}
[data-theme="dark"] .moon-icon {
  display: none;
}
.sun-icon {
  display: none;
}
.moon-icon {
  display: block;
}

/* Hero Section */
.hero {
  text-align: center;
  margin-bottom: 48px;
}

.hero h2 {
  font-size: 2.8rem;
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 12px;
  line-height: 1.2;
}

.hero p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 30px;
  font-weight: 300;
}

/* Controls (Search & Tags) */
.controls-bar {
  background: var(--card-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--card-border);
  border-radius: 20px;
  padding: 20px;
  box-shadow: var(--card-shadow);
  margin-bottom: 40px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: var(--transition-smooth);
}

/* Search Wrapper */
.search-wrapper {
  position: relative;
  width: 100%;
}

.search-input {
  width: 100%;
  padding: 14px 18px 14px 46px;
  font-size: 1rem;
  font-family: var(--font-sans);
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: 12px;
  color: var(--text-primary);
  outline: none;
  transition: var(--transition-smooth);
}

.search-input::placeholder {
  color: var(--text-muted);
}

.search-input:focus {
  border-color: var(--input-focus);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.25);
}

.search-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
  width: 20px;
  height: 20px;
}

/* Category Filter Tags */
.tags-wrapper {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.filter-tag {
  padding: 8px 16px;
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: 10px;
  background: var(--tag-bg);
  color: var(--tag-text);
  border: none;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.filter-tag:hover {
  background: rgba(99, 102, 241, 0.15);
  color: var(--accent-color);
}

.filter-tag.active {
  background: var(--tag-active-bg);
  color: var(--tag-active-text);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

/* Grid Layout */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
  transition: var(--transition-smooth);
}

/* Project Card */
.project-card {
  background: var(--card-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--card-border);
  border-radius: 20px;
  padding: 28px;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  height: 100%;
  box-shadow: var(--card-shadow);
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.project-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--accent-gradient);
  opacity: 0;
  transition: var(--transition-smooth);
}

/* Card Hover States */
.project-card:hover {
  transform: translateY(-6px);
  border-color: var(--card-border-hover);
  box-shadow: var(--card-shadow-hover);
}

.project-card:hover::before {
  opacity: 1;
}

/* Card Content Details */
.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 20px;
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(99, 102, 241, 0.1);
  color: var(--accent-color);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-smooth);
}

.project-card:hover .card-icon {
  background: var(--accent-gradient);
  color: white;
  transform: scale(1.05);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.25);
}

.card-icon svg {
  width: 24px;
  height: 24px;
}

.arrow-icon {
  color: var(--text-muted);
  transition: var(--transition-smooth);
}

.project-card:hover .arrow-icon {
  color: var(--accent-color);
  transform: translate(3px, -3px);
}

.arrow-icon svg {
  width: 20px;
  height: 20px;
}

.card-body {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.project-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 10px;
  letter-spacing: -0.3px;
  transition: var(--transition-smooth);
}

.project-card:hover .project-title {
  color: var(--accent-color);
}

.project-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 20px;
  flex-grow: 1;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: auto;
}

.card-tag {
  font-size: 0.75rem;
  padding: 4px 10px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-secondary);
  border: 1px solid var(--card-border);
  transition: var(--transition-smooth);
}

[data-theme="light"] .card-tag {
  background: rgba(0, 0, 0, 0.03);
}

/* Empty/No Results State */
.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 60px 20px;
  background: var(--card-bg);
  border: 1px dashed var(--card-border);
  border-radius: 20px;
  display: none;
}

.empty-state svg {
  width: 48px;
  height: 48px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.empty-state h3 {
  font-size: 1.2rem;
  margin-bottom: 6px;
}

.empty-state p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* Footer Details */
footer {
  margin-top: 80px;
  text-align: center;
  border-top: 1px solid var(--card-border);
  padding-top: 30px;
  transition: var(--transition-smooth);
}

footer p {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Animation Utilities */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
  animation: fadeIn 0.4s ease forwards;
}

/* Responsive Breakpoints */
@media (max-width: 768px) {
  .container {
    padding: 24px 16px 40px;
  }
  
  header {
    margin-bottom: 30px;
  }
  
  .hero h2 {
    font-size: 2.2rem;
  }
  
  .controls-bar {
    padding: 16px;
  }
  
  .project-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
}