/* ===== AudioNeo Design System ===== */

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

:root {
  --bg: #0a0a0a;
  --card: #141414;
  --border: #2a2a2a;
  --primary: #00d2a0;
  --primary-hover: #00b88a;
  --text-primary: #f0f0f0;
  --text-secondary: #888888;
  --success: #22c55e;
  --error: #ef4444;
  --warning: #eab308;
  --radius-card: 16px;
  --radius-btn: 8px;
  --max-width: 1400px;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: var(--primary); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--primary-hover); }
img { max-width: 100%; display: block; }

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

/* ===== Navbar ===== */
.navbar {
  position: sticky; top: 0; z-index: 100;
  background: rgba(10,10,10,0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.navbar .container {
  display: flex; align-items: center; justify-content: space-between; height: 64px;
}
.navbar-logo {
  font-size: 24px; font-weight: 700; color: var(--primary); letter-spacing: -0.5px;
  text-decoration: none; display: flex; align-items: center; gap: 10px;
}
.navbar-logo img {
  width: 40px; height: 40px; border-radius: 10px; object-fit: cover;
}
.navbar-nav {
  display: flex; align-items: center; gap: 24px; list-style: none;
}
.navbar-nav a {
  color: var(--text-secondary); font-size: 14px; font-weight: 500; transition: color 0.2s;
}
.navbar-nav a:hover { color: var(--text-primary); }
.lang-switch {
  font-size: 13px; padding: 6px 12px;
  border: 1px solid var(--border); border-radius: var(--radius-btn);
  color: var(--text-secondary); transition: all 0.2s; text-decoration: none;
}
.lang-switch:hover { border-color: var(--primary); color: var(--primary); }
.menu-toggle {
  display: none; background: none; border: none;
  color: var(--text-primary); font-size: 24px; cursor: pointer;
}

/* ===== Hero ===== */
.hero { text-align: center; padding: 80px 0 60px; }
.hero h1 {
  font-size: 48px; font-weight: 800; letter-spacing: -1px;
  margin-bottom: 16px; line-height: 1.1;
}
.hero h1 span { color: var(--primary); }
.hero p { font-size: 18px; color: var(--text-secondary); max-width: 600px; margin: 0 auto; }
.hero-badges { display: flex; justify-content: center; gap: 12px; margin-top: 24px; flex-wrap: wrap; }
.hero-badge {
  font-size: 13px; padding: 6px 14px; border-radius: 20px;
  background: rgba(0,210,160,0.1); color: var(--primary);
  border: 1px solid rgba(0,210,160,0.2);
}

/* ===== Tool Grid ===== */
.tools-section { padding: 40px 0 80px; }
.section-title { font-size: 28px; font-weight: 700; margin-bottom: 32px; }
.tools-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
}
.tool-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius-card); padding: 28px 24px;
  transition: all 0.3s; cursor: pointer;
  display: flex; flex-direction: column; gap: 12px;
  text-decoration: none; color: inherit;
}
.tool-card:hover {
  border-color: var(--primary); transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(0,210,160,0.08);
}
.tool-card.featured { grid-column: span 2; }
.tool-card-icon {
  width: 48px; height: 48px; border-radius: 12px;
  background: rgba(0,210,160,0.1);
  display: flex; align-items: center; justify-content: center;
}
.tool-card-icon svg {
  width: 24px; height: 24px; stroke: var(--primary);
  fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round;
}
.tool-card h3 { font-size: 18px; font-weight: 600; }
.tool-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.5; }

/* ===== Why Section ===== */
.why-section { padding: 60px 0 80px; border-top: 1px solid var(--border); }
.why-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 24px; margin-bottom: 40px; }
.why-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius-card); padding: 32px 28px; text-align: center;
}
.why-card .icon { font-size: 36px; margin-bottom: 16px; color: var(--primary); display: inline-flex; align-items: center; justify-content: center; width: 100%; }
.why-card h3 { font-size: 20px; font-weight: 600; margin-bottom: 8px; }
.why-card p { font-size: 14px; color: var(--text-secondary); }
.tags-row { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; }
.tag {
  font-size: 13px; padding: 8px 18px; border-radius: 20px;
  background: var(--card); border: 1px solid var(--border); color: var(--text-secondary);
}

/* ===== Footer ===== */
.footer { border-top: 1px solid var(--border); padding: 32px 0; text-align: center; }
.footer p { font-size: 14px; color: var(--text-secondary); }
.footer a { color: var(--text-secondary); margin: 0 8px; }
.footer a:hover { color: var(--primary); }

/* ===== Tool Page ===== */
.tool-header { padding: 48px 0 32px; text-align: center; }
.tool-header h1 { font-size: 36px; font-weight: 800; margin-bottom: 12px; }
.tool-header p { font-size: 16px; color: var(--text-secondary); max-width: 600px; margin: 0 auto 12px; }
.tool-header .tutorial-link { font-size: 14px; color: var(--primary); }

/* Upload Area */
.upload-area {
  border: 2px dashed var(--border); border-radius: var(--radius-card);
  padding: 48px 24px; text-align: center; cursor: pointer;
  transition: all 0.3s; background: var(--card); margin-bottom: 24px; position: relative;
}
.upload-area:hover, .upload-area.dragover {
  border-color: var(--primary); background: rgba(0,210,160,0.03);
}
.upload-area svg {
  width: 48px; height: 48px; stroke: var(--text-secondary);
  fill: none; stroke-width: 1.5; margin: 0 auto 16px;
}
.upload-area h3 { font-size: 16px; font-weight: 500; margin-bottom: 4px; }
.upload-area p { font-size: 13px; color: var(--text-secondary); }
.upload-area input[type="file"] {
  position: absolute; inset: 0; opacity: 0; cursor: pointer;
}

/* Settings Panel */
.settings-panel {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius-card); padding: 24px; margin-bottom: 24px;
}
.settings-panel h3 { font-size: 16px; font-weight: 600; margin-bottom: 20px; }
.setting-row {
  display: flex; align-items: center; gap: 16px; margin-bottom: 16px;
}
.setting-row:last-child { margin-bottom: 0; }
.setting-row label {
  font-size: 14px; color: var(--text-secondary); min-width: 120px; flex-shrink: 0;
}
.setting-row select, .setting-row input[type="number"] {
  background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--radius-btn); color: var(--text-primary);
  padding: 8px 12px; font-size: 14px; font-family: var(--font);
  min-width: 160px; outline: none; transition: border-color 0.2s;
}
.setting-row select:focus, .setting-row input[type="number"]:focus {
  border-color: var(--primary);
}
.setting-row input[type="range"] { flex: 1; accent-color: var(--primary); }
.setting-row .range-value {
  font-size: 14px; color: var(--primary); min-width: 50px;
  text-align: right; font-weight: 600;
}

/* Checkbox */
.checkbox-row { display: flex; align-items: center; gap: 8px; margin-bottom: 16px; }
.checkbox-row input[type="checkbox"] { accent-color: var(--primary); width: 16px; height: 16px; }
.checkbox-row label { font-size: 14px; color: var(--text-secondary); cursor: pointer; }

/* Buttons */
.btn-process {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  background: var(--primary); color: #0a0a0a; border: none;
  border-radius: var(--radius-btn); padding: 14px 32px;
  font-size: 16px; font-weight: 600; font-family: var(--font);
  cursor: pointer; transition: all 0.2s; width: 100%; margin-bottom: 24px;
}
.btn-process:hover { background: var(--primary-hover); }
.btn-process:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-process .spinner {
  width: 18px; height: 18px;
  border: 2px solid rgba(0,0,0,0.2); border-top-color: #0a0a0a;
  border-radius: 50%; animation: spin 0.6s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.btn-download {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--primary); color: #0a0a0a; border: none;
  border-radius: var(--radius-btn); padding: 10px 24px;
  font-size: 14px; font-weight: 600; font-family: var(--font);
  cursor: pointer; transition: all 0.2s;
}
.btn-download:hover { background: var(--primary-hover); }

.btn-play {
  display: inline-flex; align-items: center; gap: 8px;
  background: transparent; color: var(--primary);
  border: 1px solid var(--primary); border-radius: var(--radius-btn);
  padding: 10px 24px; font-size: 14px; font-weight: 600;
  font-family: var(--font); cursor: pointer; transition: all 0.2s;
}
.btn-play:hover { background: rgba(0,210,160,0.1); }

.btn-preview {
  background: transparent; color: var(--primary);
  border: 1px solid var(--primary); border-radius: var(--radius-btn);
  padding: 6px 16px; font-size: 13px; font-weight: 600;
  font-family: var(--font); cursor: pointer; transition: all 0.2s;
}
.btn-preview:hover { background: rgba(0,210,160,0.1); }

/* Progress */
.progress-bar {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius-card); padding: 24px; margin-bottom: 24px; display: none;
}
.progress-bar.active { display: block; }
.progress-bar .progress-track {
  width: 100%; height: 8px; background: var(--border);
  border-radius: 4px; overflow: hidden; margin-bottom: 8px;
}
.progress-bar .progress-fill {
  height: 100%; background: var(--primary); border-radius: 4px;
  transition: width 0.3s; width: 0%;
}
.progress-bar .progress-text { font-size: 14px; color: var(--text-secondary); text-align: center; }

/* Result Area */
.result-area {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius-card); padding: 24px; margin-bottom: 24px; display: none;
}
.result-area.active { display: block; }
.result-info { display: flex; align-items: center; gap: 16px; margin-bottom: 16px; flex-wrap: wrap; }
.result-info .file-name { font-size: 16px; font-weight: 600; }
.result-info .file-size { font-size: 13px; color: var(--text-secondary); }
.result-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.audio-player { width: 100%; margin-top: 16px; }
.audio-player audio { width: 100%; border-radius: var(--radius-btn); outline: none; }

/* Privacy Note */
.privacy-note {
  text-align: center; font-size: 13px; color: var(--text-secondary); padding: 16px 0;
}
.privacy-note span { margin-right: 4px; }

/* Waveform Canvas */
.waveform-container {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius-card); padding: 24px; margin-bottom: 24px; display: none;
}
.waveform-container.active { display: block; }
.waveform-canvas {
  width: 100%; height: 160px; border-radius: var(--radius-btn);
  background: var(--bg); cursor: crosshair;
}
.waveform-controls {
  display: flex; gap: 16px; margin-top: 16px; flex-wrap: wrap; align-items: center;
}
.waveform-controls label { font-size: 13px; color: var(--text-secondary); }
.waveform-controls input[type="text"] {
  background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--radius-btn); color: var(--text-primary);
  padding: 6px 10px; font-size: 13px; font-family: 'SF Mono','Consolas',monospace;
  width: 100px; outline: none;
}
.waveform-controls input[type="text"]:focus { border-color: var(--primary); }

/* File List */
.file-list {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius-card); margin-bottom: 24px; display: none;
}
.file-list.active { display: block; }
.file-list-header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 16px 24px; border-bottom: 1px solid var(--border);
}
.file-list-header h3 { font-size: 15px; font-weight: 600; }
.file-list-header .btn-clear {
  font-size: 13px; color: var(--error); background: none; border: none;
  cursor: pointer; font-family: var(--font);
}
.file-item {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 24px; border-bottom: 1px solid var(--border);
  cursor: grab; transition: background 0.2s;
}
.file-item:last-child { border-bottom: none; }
.file-item:hover { background: rgba(0,210,160,0.03); }
.file-item .drag-handle { color: var(--text-secondary); font-size: 16px; cursor: grab; }
.file-item .file-name {
  flex: 1; font-size: 14px; overflow: hidden;
  text-overflow: ellipsis; white-space: nowrap;
}
.file-item .file-size { font-size: 13px; color: var(--text-secondary); }
.file-item .btn-remove {
  background: none; border: none; color: var(--text-secondary);
  cursor: pointer; font-size: 16px; padding: 4px; transition: color 0.2s;
}
.file-item .btn-remove:hover { color: var(--error); }

/* Info Table */
.info-table { width: 100%; border-collapse: collapse; }
.info-table tr { border-bottom: 1px solid var(--border); }
.info-table tr:last-child { border-bottom: none; }
.info-table td { padding: 14px 0; font-size: 14px; }
.info-table td:first-child { color: var(--text-secondary); width: 160px; }
.info-table td:last-child { font-weight: 500; }

/* Loading Overlay */
.loading-overlay {
  position: fixed; inset: 0; background: rgba(10,10,10,0.9);
  display: none; flex-direction: column; align-items: center; justify-content: center; z-index: 999;
}
.loading-overlay.active { display: flex; }
.loading-overlay .spinner-large {
  width: 48px; height: 48px;
  border: 3px solid var(--border); border-top-color: var(--primary);
  border-radius: 50%; animation: spin 0.8s linear infinite; margin-bottom: 16px;
}
.loading-overlay p { font-size: 16px; color: var(--text-secondary); }

/* Error */
.error-msg {
  background: rgba(239,68,68,0.1); border: 1px solid rgba(239,68,68,0.3);
  border-radius: var(--radius-btn); padding: 12px 16px;
  font-size: 14px; color: var(--error); margin-bottom: 16px; display: none;
}
.error-msg.active { display: block; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .tools-grid { grid-template-columns: repeat(3,1fr); }
  .tool-card.featured { grid-column: span 2; }
  .hero h1 { font-size: 40px; }
}
@media (max-width: 768px) {
  .tools-grid { grid-template-columns: repeat(2,1fr); }
  .tool-card.featured { grid-column: span 2; }
  .hero h1 { font-size: 32px; }
  .why-grid { grid-template-columns: 1fr; }
  .navbar-nav { display: none; }
  .menu-toggle { display: block; }
  .navbar-nav.open {
    display: flex; flex-direction: column; position: absolute;
    top: 64px; left: 0; right: 0;
    background: rgba(10,10,10,0.95); padding: 16px 24px;
    border-bottom: 1px solid var(--border);
  }
  .setting-row { flex-direction: column; align-items: flex-start; gap: 8px; }
  .setting-row label { min-width: auto; }
  .setting-row select, .setting-row input[type="number"] { width: 100%; min-width: auto; }
  .waveform-controls { flex-direction: column; align-items: flex-start; }
}
@media (max-width: 480px) {
  .tools-grid { grid-template-columns: 1fr; }
  .tool-card.featured { grid-column: span 1; }
  .hero h1 { font-size: 28px; }
  .container { padding: 0 16px; }
}