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

:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --surface2: #242836;
  --border: #2e3348;
  --text: #e4e6f0;
  --text-dim: #8b8fa7;
  --accent: #6c8aff;
  --accent-hover: #8ba3ff;
  --success: #4ade80;
  --danger: #f87171;
  --warning: #fbbf24;
  --radius: 12px;
  --radius-sm: 8px;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  padding: 20px;
}

/* ===== Container ===== */
.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 10px;
}

/* ===== Header ===== */
header {
  text-align: center;
  margin-bottom: 30px;
}

header h1 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.subtitle {
  color: var(--text-dim);
  font-size: 0.95rem;
}

/* ===== Tabs ===== */
.tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
  border-bottom: 2px solid var(--border);
  padding-bottom: 0;
}

.tab {
  background: none;
  border: none;
  color: var(--text-dim);
  font-family: var(--font);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 10px 18px;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: all 0.2s;
}

.tab:hover {
  color: var(--text);
}

.tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ===== Tab Content ===== */
.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* ===== Upload Zone ===== */
.upload-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 50px 20px;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s;
  background: var(--surface);
}

.upload-zone:hover,
.upload-zone.dragover {
  border-color: var(--accent);
  background: rgba(108, 138, 255, 0.05);
}

.upload-icon {
  font-size: 3rem;
  margin-bottom: 12px;
}

.upload-zone p {
  color: var(--text);
  font-size: 1rem;
}

.upload-zone p.small {
  color: var(--text-dim);
  font-size: 0.85rem;
  margin-top: 4px;
}

/* ===== URL Input ===== */
.url-input-group {
  display: flex;
  gap: 10px;
  margin-bottom: 16px;
}

.url-input-group input {
  flex: 1;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  color: var(--text);
  font-family: var(--font);
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.2s;
}

.url-input-group input:focus {
  border-color: var(--accent);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  padding: 12px 24px;
  font-family: var(--font);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
  white-space: nowrap;
}

.btn-primary:hover {
  background: var(--accent-hover);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ===== Progress ===== */
.progress-area {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 20px;
  margin-top: 16px;
}

.file-info {
  font-size: 0.9rem;
  color: var(--text-dim);
  margin-bottom: 12px;
  word-break: break-all;
}

.progress-bar-wrapper {
  display: flex;
  align-items: center;
  gap: 12px;
}

.progress-bar {
  flex: 1;
  height: 10px;
  background: var(--surface2);
  border-radius: 5px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), #a78bfa);
  border-radius: 5px;
  transition: width 0.3s;
  width: 0%;
}

.progress-text {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  min-width: 40px;
  text-align: right;
}

.speed-info {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-top: 8px;
}

.upload-status {
  font-size: 0.85rem;
  margin-top: 8px;
  font-weight: 500;
}

/* ===== Phase Badge ===== */
.phase-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 500;
  margin-bottom: 12px;
  background: rgba(108, 138, 255, 0.15);
  color: var(--accent);
}

.phase-badge.connecting {
  background: rgba(251, 191, 36, 0.15);
  color: var(--warning);
}

.phase-badge.downloading {
  background: rgba(108, 138, 255, 0.15);
  color: var(--accent);
}

.phase-badge.uploading {
  background: rgba(167, 139, 250, 0.15);
  color: #a78bfa;
}

/* ===== Result ===== */
.result-area {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 24px;
  margin-top: 24px;
  border: 1px solid rgba(74, 222, 128, 0.2);
}

.result-area h3 {
  color: var(--success);
  margin-bottom: 12px;
  font-size: 1.1rem;
}

.result-meta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.result-filename,
.result-size {
  font-size: 0.85rem;
  color: var(--text-dim);
}

.result-accounts {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.acc-badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 500;
  background: rgba(74, 222, 128, 0.12);
  color: var(--success);
}

/* ===== Links ===== */
.links-container {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 16px;
}

.link-row {
  display: flex;
  gap: 8px;
  align-items: center;
}

.link-label {
  font-size: 0.8rem;
  color: var(--text-dim);
  min-width: 28px;
  font-weight: 600;
}

.link-row input {
  flex: 1;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 10px;
  color: var(--text);
  font-family: var(--font);
  font-size: 0.82rem;
  outline: none;
}

.copy-btn {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 14px;
  color: var(--text);
  font-family: var(--font);
  font-size: 0.82rem;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

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

.copy-btn.copied {
  border-color: var(--success);
  color: var(--success);
}

.btn-copy-all {
  width: 100%;
  padding: 10px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s;
}

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

/* ===== History ===== */
.history-actions {
  margin-bottom: 16px;
}

.btn-danger {
  background: rgba(248, 113, 113, 0.1);
  border: 1px solid rgba(248, 113, 113, 0.3);
  border-radius: var(--radius-sm);
  padding: 8px 16px;
  color: var(--danger);
  font-family: var(--font);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-danger:hover {
  background: rgba(248, 113, 113, 0.2);
}

.history-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.history-item {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 16px;
  border: 1px solid var(--border);
}

.h-name {
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 4px;
  word-break: break-all;
}

.h-meta {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 10px;
}

.h-links {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.empty-state {
  text-align: center;
  color: var(--text-dim);
  padding: 30px;
  font-size: 0.95rem;
}

/* ===== Toast ===== */
.toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--surface2);
  color: var(--text);
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-family: var(--font);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
  transition: transform 0.3s ease;
  z-index: 1000;
  border: 1px solid var(--border);
}

.toast.show {
  transform: translateX(-50%) translateY(0);
}

.toast.error {
  border-color: rgba(248, 113, 113, 0.4);
  color: var(--danger);
}

/* ===== Responsive ===== */
@media (max-width: 600px) {
  .url-input-group {
    flex-direction: column;
  }

  .link-row {
    flex-wrap: wrap;
  }

  .link-row input {
    min-width: 0;
  }

  header h1 {
    font-size: 1.4rem;
  }
}