/* TTS Service — Clean, modern UI */
:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --success: #16a34a;
    --danger: #dc2626;
    --warning: #f59e0b;
    --bg: #f8fafc;
    --card: #ffffff;
    --text: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --radius: 12px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

.container { max-width: 800px; margin: 0 auto; padding: 20px; }

/* Header */
header {
    background: var(--card);
    border-bottom: 1px solid var(--border);
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo { font-size: 1.4em; font-weight: 700; color: var(--primary); }
.logo span { color: var(--text-muted); font-weight: 400; font-size: 0.7em; }

.user-info {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.9em;
}

.credits-badge {
    background: var(--primary);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.85em;
}

/* Cards */
.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 20px;
}

.card h2 {
    font-size: 1.2em;
    margin-bottom: 16px;
    color: var(--text);
}

.card-muted { color: var(--text-muted); font-size: 0.9em; }

/* Forms */
textarea {
    width: 100%;
    min-height: 100px;
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-family: inherit;
    font-size: 1em;
    resize: vertical;
    transition: border-color 0.2s;
}

textarea:focus { outline: none; border-color: var(--primary); }

.char-count { text-align: right; font-size: 0.8em; color: var(--text-muted); margin-top: 4px; }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 0.95em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

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

.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover:not(:disabled) { background: var(--primary-hover); }

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

.btn-sm { padding: 6px 14px; font-size: 0.85em; }

.btn-group { display: flex; gap: 8px; margin-top: 16px; flex-wrap: wrap; }

/* Language selector */
.lang-selector {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 12px;
}
.lang-btn {
    padding: 6px 14px;
    border: 1px solid var(--border);
    border-radius: 20px;
    background: var(--card);
    cursor: pointer;
    font-size: 0.85em;
    transition: all 0.2s;
}
.lang-btn.active { background: var(--primary); color: white; border-color: var(--primary); }
.lang-btn:hover { border-color: var(--primary); }

/* Audio player */
.audio-result {
    margin-top: 16px;
    padding: 16px;
    background: #f0fdf4;
    border-radius: 8px;
    border: 1px solid #bbf7d0;
}

.audio-result audio { width: 100%; margin-top: 8px; }
.audio-result .meta { font-size: 0.85em; color: var(--text-muted); }

/* Features grid */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    margin-top: 20px;
}
.feature-card {
    padding: 20px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    text-align: center;
}
.feature-card h3 { font-size: 1em; margin-bottom: 8px; }
.feature-card p { font-size: 0.85em; color: var(--text-muted); }

/* Toast notifications */
.toast {
    position: fixed;
    bottom: 20px;
    right: 20px;
    padding: 12px 20px;
    border-radius: 8px;
    color: white;
    font-weight: 500;
    z-index: 1000;
    animation: slideIn 0.3s ease;
}

.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }

@keyframes slideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* Footer */
footer {
    text-align: center;
    padding: 20px;
    color: var(--text-muted);
    font-size: 0.85em;
}

/* Responsive */
@media (max-width: 600px) {
    .features { grid-template-columns: 1fr; }
    header .container { flex-direction: column; gap: 8px; }
}