/* ===========================================
   Tinder Bio Roast - Styles
   Mobile-first, 320px base
   =========================================== */

/* CSS Reset & Variables */
:root {
    --color-bg: #1a1a2e;
    --color-surface: #16213e;
    --color-surface-light: #1f2b47;
    --color-primary: #ff6b6b;
    --color-primary-dark: #e05555;
    --color-secondary: #feca57;
    --color-text: #ffffff;
    --color-text-muted: #a0a0a0;
    --color-success: #2ecc71;
    --color-error: #e74c3c;

    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    --transition-speed: 0.3s;
    --border-radius: 12px;
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
}

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

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    background: var(--color-bg);
    color: var(--color-text);
    min-height: 100vh;
    min-height: 100dvh;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* Container */
.container {
    max-width: 480px;
    margin: 0 auto;
    padding: var(--spacing-md);
    min-height: 100vh;
    min-height: 100dvh;
}

/* Screen System */
.screen {
    display: none;
    flex-direction: column;
    min-height: calc(100vh - var(--spacing-md) * 2);
    min-height: calc(100dvh - var(--spacing-md) * 2);
}

.screen.active {
    display: flex;
}

/* ===========================================
   Input Screen
   =========================================== */

.header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    padding-top: var(--spacing-lg);
}

.title {
    font-size: 1.75rem;
    font-weight: 800;
    margin-bottom: var(--spacing-xs);
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 1rem;
    color: var(--color-text-muted);
    font-style: italic;
}

.input-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    margin-bottom: var(--spacing-md);
}

.input-label {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xs);
}

.bio-textarea {
    width: 100%;
    min-height: 150px;
    padding: var(--spacing-md);
    font-size: 1rem;
    font-family: inherit;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-surface);
    border: 2px solid var(--color-surface-light);
    border-radius: var(--border-radius);
    resize: vertical;
    transition: border-color var(--transition-speed);
}

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

.bio-textarea::placeholder {
    color: var(--color-text-muted);
    opacity: 0.7;
}

.char-counter {
    text-align: right;
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-top: var(--spacing-xs);
    transition: color var(--transition-speed);
}

.char-counter.warning {
    color: var(--color-secondary);
}

.char-counter.error {
    color: var(--color-error);
}

.input-error {
    color: var(--color-error);
    font-size: 0.875rem;
    margin-top: var(--spacing-xs);
    text-align: center;
}

/* ===========================================
   Buttons
   =========================================== */

.btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    width: 100%;
    min-height: 52px;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 1rem;
    font-weight: 700;
    font-family: inherit;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-speed);
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    user-select: none;
}

.btn:active {
    transform: scale(0.98);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: var(--color-text);
    box-shadow: 0 4px 15px rgba(255, 107, 107, 0.3);
}

.btn-primary:hover:not(:disabled) {
    box-shadow: 0 6px 20px rgba(255, 107, 107, 0.4);
}

.btn-secondary {
    background: var(--color-surface);
    color: var(--color-text);
    border: 2px solid var(--color-surface-light);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--color-surface-light);
}

.btn-outline {
    background: transparent;
    color: var(--color-text-muted);
    border: 2px solid var(--color-surface-light);
}

.btn-outline:hover:not(:disabled) {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* Usage Info */
.usage-info {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm);
    font-size: 0.875rem;
    color: var(--color-text-muted);
    background: var(--color-surface);
    border-radius: var(--border-radius);
}

.usage-info strong {
    color: var(--color-secondary);
}

/* ===========================================
   Loading Screen
   =========================================== */

.loading-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
}

.loading-spinner {
    width: 60px;
    height: 60px;
    border: 4px solid var(--color-surface-light);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.loading-message {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    text-align: center;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* ===========================================
   Results Screen
   =========================================== */

.results-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    padding-top: var(--spacing-md);
}

.results-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-secondary);
}

.results-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.result-card {
    background: var(--color-surface);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    border-left: 4px solid var(--color-primary);
}

.roast-card {
    border-left-color: var(--color-primary);
}

.tips-card {
    border-left-color: var(--color-secondary);
}

.rewrite-card {
    border-left-color: var(--color-success);
}

.card-title {
    font-size: 0.875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-muted);
}

.card-content {
    font-size: 1rem;
    line-height: 1.6;
}

.roast-card .card-content {
    font-style: italic;
    color: var(--color-primary);
}

.tips-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.tips-list li {
    padding-left: var(--spacing-lg);
    position: relative;
}

.tips-list li::before {
    content: '•';
    position: absolute;
    left: var(--spacing-xs);
    color: var(--color-secondary);
    font-weight: bold;
}

.rewrite-content {
    background: var(--color-surface-light);
    padding: var(--spacing-md);
    border-radius: calc(var(--border-radius) / 2);
    color: var(--color-success);
}

.results-actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

/* ===========================================
   Error Screen
   =========================================== */

.error-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    text-align: center;
    padding: var(--spacing-lg);
}

.error-icon {
    font-size: 4rem;
}

.error-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-error);
}

.error-message {
    color: var(--color-text-muted);
    max-width: 280px;
}

/* ===========================================
   Limit Screen
   =========================================== */

.limit-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    text-align: center;
    padding: var(--spacing-lg);
}

.limit-icon {
    font-size: 4rem;
}

.limit-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-secondary);
}

.limit-message {
    color: var(--color-text-muted);
}

.limit-countdown {
    font-size: 1.125rem;
    color: var(--color-text);
}

/* ===========================================
   Toast Notification
   =========================================== */

.toast {
    position: fixed;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--color-surface);
    color: var(--color-text);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    transition: transform var(--transition-speed);
    z-index: 1000;
}

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

.toast.success {
    border-left: 4px solid var(--color-success);
}

.toast.error {
    border-left: 4px solid var(--color-error);
}

/* ===========================================
   Responsive - Tablet+
   =========================================== */

@media (min-width: 768px) {
    .container {
        padding: var(--spacing-xl);
    }

    .title {
        font-size: 2.25rem;
    }

    .subtitle {
        font-size: 1.125rem;
    }

    .bio-textarea {
        min-height: 180px;
    }

    .results-actions {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .results-actions .btn {
        flex: 1;
        min-width: 140px;
    }

    .results-actions .btn-outline {
        flex: 0 0 100%;
    }
}