/* AAA OS v1.0 Production Release Stylesheet */
:root {
  --bg-primary: #070B14;
  --bg-secondary: #0D1526;
  --bg-card: rgba(15, 23, 42, 0.75);
  --bg-card-hover: rgba(30, 41, 59, 0.85);
  --border-color: rgba(56, 189, 248, 0.18);
  --border-glow: rgba(0, 242, 254, 0.45);
  
  --accent-cyan: #00F2FE;
  --accent-sky: #38BDF8;
  --accent-blue: #2563EB;
  --accent-emerald: #10B981;
  --accent-amber: #F59E0B;
  --accent-rose: #F43F5E;
  
  --text-main: #F8FAFC;
  --text-muted: #94A3B8;
  --text-dim: #64748B;
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.5), 0 0 1px 1px rgba(255, 255, 255, 0.05);
  --shadow-glow: 0 0 25px rgba(0, 242, 254, 0.25);
}

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

body {
  background-color: var(--bg-primary);
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(0, 242, 254, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 85% 65%, rgba(37, 99, 235, 0.08) 0%, transparent 45%),
    linear-gradient(to bottom, #070B14, #0A101D);
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header & Nav */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  background: rgba(7, 11, 20, 0.85);
  border-bottom: 1px solid var(--border-color);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: #fff;
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.brand-badge {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
  color: #070B14;
  font-size: 0.72rem;
  font-weight: 800;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.nav-links {
  display: flex;
  gap: 20px;
  align-items: center;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: all 0.2s;
}

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

/* Hero Section */
.hero {
  padding: 70px 0 50px;
  text-align: center;
  position: relative;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: rgba(0, 242, 254, 0.1);
  border: 1px solid rgba(0, 242, 254, 0.3);
  color: var(--accent-cyan);
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero-pill .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 10px var(--accent-cyan);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.85); }
}

.hero h1 {
  font-size: clamp(2.4rem, 5vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 20px;
  background: linear-gradient(135deg, #FFFFFF 30%, #94A3B8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero h1 span {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-sky));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 760px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

/* Quick Specs Ribbon */
.specs-ribbon {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
  margin-bottom: 48px;
}

.spec-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 8px 16px;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  color: var(--text-main);
  backdrop-filter: blur(8px);
}

.spec-badge .label {
  color: var(--text-dim);
  font-weight: 500;
}

.spec-badge .val {
  font-weight: 600;
  color: var(--accent-cyan);
}

/* ROM Downloader Main Card */
.rom-download-card {
  background: linear-gradient(145deg, rgba(13, 21, 38, 0.95), rgba(7, 11, 20, 0.98));
  border: 1px solid var(--border-glow);
  box-shadow: var(--shadow-card), var(--shadow-glow);
  border-radius: var(--radius-lg);
  padding: 40px;
  max-width: 840px;
  margin: 0 auto 60px;
  position: relative;
  overflow: hidden;
  text-align: left;
}

.rom-download-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-blue), var(--accent-cyan));
}

.rom-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 20px;
  margin-bottom: 24px;
}

.rom-title-grp h3 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.rom-title-grp .meta {
  color: var(--text-muted);
  font-size: 0.92rem;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.btn-primary {
  background: linear-gradient(135deg, #00F2FE 0%, #0284C7 100%);
  color: #070B14;
  border: none;
  font-weight: 700;
  font-size: 1.05rem;
  padding: 14px 28px;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  transition: all 0.25s;
  box-shadow: 0 4px 15px rgba(0, 242, 254, 0.35);
  text-decoration: none;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 242, 254, 0.5);
  filter: brightness(1.1);
}

.btn-secondary {
  background: rgba(30, 41, 59, 0.8);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s;
  text-decoration: none;
}

.btn-secondary:hover {
  background: rgba(51, 65, 85, 0.9);
  border-color: var(--accent-sky);
}

/* Download Progress Bar */
.download-progress-box {
  display: none;
  background: rgba(15, 23, 42, 0.9);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-top: 24px;
}

.progress-header {
  display: flex;
  justify-content: space-between;
  font-size: 0.92rem;
  margin-bottom: 10px;
}

.progress-track {
  width: 100%;
  height: 10px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-full);
  overflow: hidden;
  position: relative;
}

.progress-fill {
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-sky));
  transition: width 0.2s ease;
  box-shadow: 0 0 10px var(--accent-cyan);
}

.progress-status {
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-top: 10px;
  display: flex;
  justify-content: space-between;
}

/* Checksum Display Box */
.checksum-box {
  background: rgba(0, 0, 0, 0.4);
  border: 1px dashed rgba(56, 189, 248, 0.25);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--accent-sky);
  display: flex;
  align-items: center;
  justify-content: space-between;
  word-break: break-all;
  margin-top: 20px;
}

.copy-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px 8px;
  font-size: 0.78rem;
  transition: color 0.2s;
  display: flex;
  align-items: center;
  gap: 4px;
}

.copy-btn:hover {
  color: var(--accent-cyan);
}

/* Section Header */
.section-header {
  text-align: center;
  margin: 60px 0 36px;
}

.section-header h2 {
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.section-header p {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 600px;
  margin: 0 auto;
}

/* Feature Grid */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
  margin-bottom: 60px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all 0.3s;
  backdrop-filter: blur(10px);
}

.card:hover {
  border-color: var(--border-glow);
  transform: translateY(-4px);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-card);
}

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: rgba(0, 242, 254, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
  font-size: 1.6rem;
  margin-bottom: 20px;
  border: 1px solid rgba(0, 242, 254, 0.25);
}

.card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Mockup Showcase */
.showcase-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
  align-items: center;
  margin: 60px 0;
}

.showcase-img {
  width: 100%;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
}

/* Parts Table */
.parts-table-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-bottom: 60px;
}

.parts-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  margin-top: 16px;
}

.parts-table th, .parts-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.parts-table th {
  color: var(--text-dim);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.78rem;
  letter-spacing: 0.05em;
}

.parts-table td.mono {
  font-family: var(--font-mono);
  color: var(--accent-sky);
  font-size: 0.85rem;
}

/* Code Snippet Box */
.code-box {
  background: #04070D;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin: 16px 0;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: #38BDF8;
  overflow-x: auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Checksum Checker Dropzone */
.dropzone {
  border: 2px dashed rgba(56, 189, 248, 0.35);
  border-radius: var(--radius-lg);
  padding: 40px 20px;
  text-align: center;
  background: rgba(15, 23, 42, 0.4);
  cursor: pointer;
  transition: all 0.2s;
  margin: 24px 0;
}

.dropzone:hover, .dropzone.dragover {
  border-color: var(--accent-cyan);
  background: rgba(0, 242, 254, 0.05);
}

/* Footer */
footer {
  border-top: 1px solid var(--border-color);
  padding: 48px 0;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.9rem;
  background: rgba(7, 11, 20, 0.9);
}

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

/* Responsive */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .rom-download-card { padding: 24px; }
  .showcase-grid { grid-template-columns: 1fr; }
  .grid-3 { grid-template-columns: 1fr; }
}