/* ===== Design Tokens ===== */
:root {
    /* 抖音配色 - 淺色主題 */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f8f8;
    --bg-tertiary: #f0f0f0;
    --bg-elevated: #ffffff;

    --border-subtle: rgba(0, 0, 0, 0.06);
    --border-default: rgba(0, 0, 0, 0.1);
    --border-strong: rgba(0, 0, 0, 0.15);

    --text-primary: #161823;
    --text-secondary: #5a5a5a;
    --text-tertiary: #8a8a8a;

    /* 抖音紅 Razzmatazz */
    --accent: #FE2C55;
    --accent-hover: #FF5C7C;
    --accent-subtle: rgba(254, 44, 85, 0.15);

    /* 抖音青 Splash */
    --accent-secondary: #25F4EE;
    --accent-secondary-hover: #5FFFF8;
    --accent-secondary-subtle: rgba(37, 244, 238, 0.15);

    /* 用青色表示成功 */
    --success: #25F4EE;
    --success-subtle: rgba(37, 244, 238, 0.15);

    --warning: #FFD700;
    --warning-subtle: rgba(255, 215, 0, 0.15);

    --error: #FE2C55;
    --error-subtle: rgba(254, 44, 85, 0.15);

    /* Spacing */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;

    /* Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;

    /* Transitions */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --duration-fast: 150ms;
    --duration-normal: 250ms;
    --duration-slow: 400ms;
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
}

/* ===== App Layout ===== */
.app {
    max-width: 720px;
    margin: 0 auto;
    padding: var(--space-6);
    min-height: 100vh;
}

/* ===== Header ===== */
.header {
    margin-bottom: var(--space-6);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

/* 抖音故障藝術 Logo */
.logo-icon {
    position: relative;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-d {
    position: absolute;
    font-size: 2.5rem;
    font-weight: 900;
    line-height: 1;
}

.logo-d-red {
    color: var(--accent);
    transform: translate(-2px, 0);
}

.logo-d-cyan {
    color: var(--accent-secondary);
    transform: translate(2px, 0);
    opacity: 0.7;
    mix-blend-mode: screen;
}

.logo-text h1 {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-text p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 2px;
}

/* ===== Guide Section ===== */
.guide-section {
    margin-bottom: var(--space-5);
}

.guide-steps {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-subtle);
}

.guide-step {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.step-number {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-subtle);
    color: var(--accent);
    font-size: 0.75rem;
    font-weight: 700;
    border-radius: 50%;
}

.step-text {
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

.guide-arrow {
    color: var(--text-tertiary);
    font-size: 0.75rem;
    margin: 0 var(--space-1);
}

/* ===== Input Section ===== */
.input-section {
    margin-bottom: var(--space-6);
}

.input-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    padding: var(--space-5);
}

.input-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: var(--space-3);
}

.input-header label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
}

.input-hint {
    font-size: 0.75rem;
    color: var(--text-tertiary);
}

.input-card textarea {
    width: 100%;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: var(--space-3) var(--space-4);
    font-family: inherit;
    font-size: 0.9375rem;
    color: var(--text-primary);
    resize: none;
    transition: border-color var(--duration-fast) var(--ease-out),
                box-shadow var(--duration-fast) var(--ease-out);
}

.input-card textarea::placeholder {
    color: var(--text-tertiary);
}

.input-card textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-subtle);
}

.input-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: var(--space-4);
}

.link-count {
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

.link-count .count-number {
    font-weight: 600;
    color: var(--text-secondary);
}

.link-count.has-links .count-number {
    color: var(--accent);
}

.link-count.over-limit .count-number {
    color: var(--warning);
}

.link-warning {
    display: none;
    font-size: 0.75rem;
    color: var(--warning);
    margin-top: var(--space-2);
}

.link-warning.visible {
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.max-hint {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    margin-left: var(--space-2);
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-out);
    text-decoration: none;
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--accent);
    color: white;
    box-shadow: 0 2px 8px rgba(254, 44, 85, 0.3);
}

.btn-primary:hover:not(:disabled) {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(254, 44, 85, 0.4);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
    box-shadow: 0 2px 8px rgba(254, 44, 85, 0.3);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-default);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--bg-elevated);
    border-color: var(--border-strong);
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
}

.btn-ghost:hover:not(:disabled) {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-icon {
    transition: transform var(--duration-fast) var(--ease-out);
}

.btn:hover .btn-icon {
    transform: translateX(2px);
}

.btn-icon-small {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-tertiary);
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-out);
}

.btn-icon-small:hover {
    background: var(--bg-elevated);
    color: var(--text-primary);
}

/* ===== Tasks Section ===== */
.tasks-section {
    display: none;
}

.tasks-section.visible {
    display: block;
}

.tasks-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-4);
}

.tasks-header h2 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.tasks-stats {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 0.75rem;
    color: var(--text-tertiary);
}

.stats-divider {
    opacity: 0.3;
}

.tasks-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

/* ===== Task Card ===== */
.task-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: border-color var(--duration-normal) var(--ease-out);
}

.task-card:hover {
    border-color: var(--border-default);
}

.task-card[data-status="processing"] {
    border-color: var(--accent);
}

.task-card[data-status="completed"] {
    border-color: var(--success);
}

.task-card[data-status="error"] {
    border-color: var(--error);
}

/* Task Header */
.task-header {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-4);
    cursor: pointer;
}

.task-status {
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    font-size: 1rem;
}

.task-card[data-status="pending"] .task-status {
    background: var(--bg-tertiary);
}

.task-card[data-status="processing"] .task-status {
    background: var(--accent-subtle);
}

.task-card[data-status="completed"] .task-status {
    background: var(--success-subtle);
}

.task-card[data-status="error"] .task-status {
    background: var(--error-subtle);
}

.task-card[data-status="pending"] .status-icon::before { content: '⏳'; }
.task-card[data-status="processing"] .status-icon::before { content: '⚡'; }
.task-card[data-status="completed"] .status-icon::before { content: '✅'; }
.task-card[data-status="error"] .status-icon::before { content: '❌'; }

/* Processing animation */
.task-card[data-status="processing"] .task-status {
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

.task-info {
    flex: 1;
    min-width: 0;
}

.task-title {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 2px;
}

.task-url {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.task-toggle {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-tertiary);
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-out);
}

.task-toggle:hover {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
}

.task-toggle svg {
    transition: transform var(--duration-normal) var(--ease-out);
}

.task-card.expanded .task-toggle svg {
    transform: rotate(180deg);
}

/* Task Progress */
.task-progress {
    padding: 0 var(--space-4) var(--space-4);
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

/* 只有完成的卡片才隱藏進度條 */
.task-card[data-status="completed"]:not(.expanded) .task-progress {
    display: none;
}

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

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent) 0%, var(--accent-secondary) 100%);
    border-radius: 2px;
    width: 0%;
    transition: width 0.3s ease-out;
}

/* 當沒有設定寬度時顯示小動畫指示處理中 */
.task-card[data-status="processing"] .progress-fill[style*="width: 0%"],
.task-card[data-status="processing"] .progress-fill:not([style*="width"]) {
    width: 20%;
    animation: pulse-progress 1.5s ease-in-out infinite;
}

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

.progress-text {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    min-width: 60px;
    text-align: right;
}

/* Task Content (Expandable) */
.task-content {
    display: none;
    padding: 0 var(--space-4) var(--space-4);
    border-top: 1px solid var(--border-subtle);
}

.task-card.expanded .task-content {
    display: block;
    animation: slideDown var(--duration-normal) var(--ease-out);
}

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

.task-video {
    margin-top: var(--space-4);
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--bg-primary);
}

.task-video video {
    width: 100%;
    display: block;
}

.task-transcript {
    margin-top: var(--space-4);
}

.transcript-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-2);
}

.transcript-header span {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.transcript-text {
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    padding: var(--space-4);
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.7;
    max-height: 200px;
    overflow-y: auto;
    white-space: pre-wrap;
}

.task-actions {
    display: flex;
    gap: var(--space-2);
    margin-top: var(--space-4);
}

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

/* ===== Empty State ===== */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-8) var(--space-4);
    text-align: center;
}

.empty-state.hidden {
    display: none;
}

.empty-icon {
    font-size: 3rem;
    margin-bottom: var(--space-4);
    opacity: 0.5;
}

.empty-state p {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-2);
}

.empty-hint {
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

/* ===== Toast Notifications ===== */
.toast {
    position: fixed;
    bottom: var(--space-6);
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--bg-elevated);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
    padding: var(--space-3) var(--space-5);
    font-size: 0.875rem;
    color: var(--text-primary);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
    opacity: 0;
    transition: all var(--duration-normal) var(--ease-out);
    z-index: 1000;
}

.toast.visible {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.toast.success {
    border-color: var(--success);
}

/* ===== Responsive ===== */
@media (max-width: 640px) {
    .app {
        padding: var(--space-4);
    }

    .input-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-1);
    }

    .input-footer {
        flex-direction: column;
        gap: var(--space-3);
    }

    .input-footer .btn {
        width: 100%;
    }

    .tasks-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-2);
    }

    .task-actions {
        flex-direction: column;
    }
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border-default);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--border-strong);
}