/* ============================================================
   2FA 验证码生成器 — 样式表
   ============================================================ */

:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #ef4444;
    --bg: #0f172a;
    --bg-card: #1e293b;
    --bg-input: #334155;
    --text: #f1f5f9;
    --text-muted: #94a3b8;
    --border: #334155;
    --radius: 12px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    min-height: 100vh;
    padding: 20px;
}

/* ---- Layout ---- */

.app {
    max-width: 480px;
    margin: 0 auto;
}

header {
    text-align: center;
    padding: 24px 0 16px;
}

header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.subtitle {
    color: var(--text-muted);
    font-size: 0.875rem;
}

footer {
    text-align: center;
    padding: 24px 0;
    color: var(--text-muted);
    font-size: 0.75rem;
}

/* ---- Buttons ---- */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    border: none;
    border-radius: 8px;
    padding: 10px 20px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    color: #fff;
}

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

.btn-success {
    background: var(--success);
}
.btn-success:hover { background: #16a34a; }

.btn-secondary {
    background: var(--bg-input);
    color: var(--text-muted);
}
.btn-secondary:hover { background: #475569; }

.btn-outline {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-muted);
}
.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.btn-block { width: 100%; }
.btn-sm { padding: 6px 14px; font-size: 0.8rem; }

.icon { font-size: 1.1em; }

/* ---- Add Form ---- */

.add-section {
    margin-bottom: 16px;
}

.add-form {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 20px;
    margin-top: 12px;
    animation: slideDown 0.2s ease;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-8px); }
    to   { opacity: 1; transform: translateY(0); }
}

.form-group {
    margin-bottom: 12px;
}

.form-group label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 4px;
    font-weight: 500;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 10px 12px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-size: 0.9rem;
    outline: none;
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus {
    border-color: var(--primary);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 10px;
}

.form-actions {
    display: flex;
    gap: 10px;
    margin-top: 16px;
}

.form-actions .btn {
    flex: 1;
}

/* ---- Token Cards ---- */

.tokens-container {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 16px;
}

.token-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 16px 20px;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: scale(0.97); }
    to   { opacity: 1; transform: scale(1); }
}

.token-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.token-name {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
}

.token-actions {
    display: flex;
    gap: 4px;
}

.token-actions button {
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 0.9rem;
    transition: background 0.2s;
    color: var(--text-muted);
}

.token-actions button:hover {
    background: var(--bg-input);
}

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

.delete-btn:hover {
    color: var(--danger) !important;
}

/* 验证码数字 */

.token-code {
    font-size: 2.5rem;
    font-weight: 700;
    font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
    letter-spacing: 4px;
    text-align: center;
    padding: 8px 0;
    color: #fff;
    transition: color 0.3s;
}

.token-code.updated {
    color: var(--success);
}

/* 进度条 */

.token-timer {
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 8px 0;
}

.progress-track {
    flex: 1;
    height: 4px;
    background: var(--bg-input);
    border-radius: 2px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: var(--primary);
    border-radius: 2px;
    transition: width 1s linear;
}

.progress-bar.warning {
    background: var(--warning);
}

.progress-bar.danger {
    background: var(--danger);
    animation: pulse 0.5s ease infinite alternate;
}

@keyframes pulse {
    from { opacity: 1; }
    to   { opacity: 0.5; }
}

.timer-text {
    font-size: 0.8rem;
    color: var(--text-muted);
    min-width: 28px;
    text-align: right;
    font-variant-numeric: tabular-nums;
}

.token-meta {
    font-size: 0.7rem;
    color: var(--text-muted);
    opacity: 0.6;
    text-align: right;
}

/* ---- Empty State ---- */

.empty-state {
    text-align: center;
    padding: 48px 20px;
    color: var(--text-muted);
}

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

.empty-hint {
    font-size: 0.8rem;
    opacity: 0.6;
    margin-top: 8px;
}

/* ---- Import / Export ---- */

.io-section {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 8px;
}

/* ---- Shake animation ---- */

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20%  { transform: translateX(-6px); }
    40%  { transform: translateX(6px); }
    60%  { transform: translateX(-4px); }
    80%  { transform: translateX(4px); }
}

.shake {
    animation: shake 0.4s ease;
    border-color: var(--danger) !important;
}

/* ---- Responsive ---- */

@media (max-width: 480px) {
    body { padding: 12px; }

    header h1 { font-size: 1.4rem; }

    .token-code { font-size: 2rem; }

    .form-row {
        grid-template-columns: 1fr;
    }
}