/**
 * Help Tutor Styles
 * 引導式學習系統樣式
 *
 * 設計語言：與主聊天介面 (styles.css) 完全一致
 * - 卡片：白底 + border-strong 邊框 + 左側橘色漸層條
 * - 文字：text-primary 正文 / text-primary 標題 / text-tertiary 次要
 * - 按鈕：pill 形 (border-radius: 20px)
 * - 動效：cubic-bezier(0.4, 0, 0.2, 1)
 *
 * Design Token Migration: 2026-02-16
 * 所有硬編碼色碼已遷移至 brand-system.css 定義的 Design Token
 */

/* ========== 基礎樣式 ========== */
.help-tutor-content {
    padding: 0 !important;
}

.help-tutor-message .message-content {
    background: transparent !important;
    padding: 0 !important;
    box-shadow: none !important;
}

/* ========== 歡迎訊息 ========== */
.help-tutor-welcome {
    text-align: center;
    padding: 32px 28px;
    background: var(--color-bg-elevated);
    border-radius: 20px;
    border: 1px solid var(--color-border-strong);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.help-tutor-avatar {
    font-size: 44px;
    display: block;
    margin-bottom: 14px;
    animation: helpTutorBounce 2.5s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}

@keyframes helpTutorBounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-6px); }
}

.help-tutor-welcome p {
    margin: 0 0 8px 0;
    font-size: 15.5px;
    color: var(--color-text-primary);
    line-height: 1.75;
}

.help-tutor-subtitle {
    color: var(--color-text-tertiary) !important;
    font-size: 13.5px !important;
    font-weight: 400;
    letter-spacing: 0.01em;
}

/* ========== 主題選單 ========== */
.help-tutor-menu {
    padding: 20px 20px 20px calc(20px + 12px);
    background: var(--color-bg-elevated);
    border-radius: 20px;
    border: 1px solid var(--color-border-strong);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.help-tutor-menu::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, var(--color-accent) 0%, var(--primitive-orange-300) 100%);
    border-radius: 20px 0 0 20px;
}

.help-tutor-topics {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.help-tutor-topic-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 18px 12px;
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border-strong);
    border-radius: 16px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-family: inherit;
    box-shadow: var(--shadow-xs);
    position: relative;
    overflow: hidden;
}

.help-tutor-topic-btn:hover {
    background: var(--color-bg-elevated);
    border-color: var(--color-accent);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--color-accent-subtle);
}

.help-tutor-topic-btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-xs);
}

.help-tutor-topic-btn .topic-icon {
    font-size: 28px;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.help-tutor-topic-btn:hover .topic-icon {
    transform: scale(1.1);
}

.help-tutor-topic-btn .topic-name {
    font-size: 13.5px;
    font-weight: 600;
    color: var(--color-text-primary);
    transition: color 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.help-tutor-topic-btn:hover .topic-name {
    color: var(--color-accent-hover);
}

/* ========== 主題標題 ========== */
.help-tutor-topic-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.topic-icon-large {
    font-size: 32px;
}

.topic-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-text-primary);
    letter-spacing: -0.01em;
}

/* ========== 簡潔說明（第一層） ========== */
.help-tutor-brief {
    padding: 20px 20px 20px calc(20px + 12px);
    background: var(--color-bg-elevated);
    border-radius: 20px;
    border: 1px solid var(--color-border-strong);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.help-tutor-brief::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, var(--color-accent) 0%, var(--primitive-orange-300) 100%);
    border-radius: 20px 0 0 20px;
}

.help-tutor-description {
    font-size: 15.5px;
    color: var(--color-text-primary);
    line-height: 1.75;
    margin: 0 0 20px 0;
}

/* ========== 詳細教學（第二層） ========== */
.help-tutor-detailed {
    padding: 20px 20px 20px calc(20px + 12px);
    background: var(--color-bg-elevated);
    border-radius: 20px;
    border: 1px solid var(--color-border-strong);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.help-tutor-detailed::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, var(--color-accent) 0%, var(--primitive-orange-300) 100%);
    border-radius: 20px 0 0 20px;
}

.help-tutor-section {
    margin-bottom: 20px;
}

.help-tutor-section:last-child {
    margin-bottom: 0;
}

.help-tutor-section h4 {
    font-size: 15.5px;
    font-weight: 700;
    color: var(--color-text-primary);
    margin: 0 0 10px 0;
    letter-spacing: -0.01em;
}

.help-tutor-steps {
    margin: 0;
    padding-left: 24px;
    color: var(--color-text-primary);
    font-size: 15px;
    line-height: 1.75;
}

.help-tutor-steps li {
    margin-bottom: 6px;
}

.help-tutor-steps li:last-child {
    margin-bottom: 0;
}

.help-tutor-examples {
    margin: 0;
    padding: 0;
    list-style: none;
    color: var(--color-text-secondary);
    font-size: 15px;
    line-height: 1.75;
}

.help-tutor-examples li {
    padding: 4px 0;
    transition: color 0.2s ease;
}

.help-tutor-examples li:hover {
    color: var(--color-text-primary);
}

/* ========== 進階問答（第三層） ========== */
.help-tutor-free-ask {
    padding: 20px 20px 20px calc(20px + 12px);
    background: var(--color-bg-elevated);
    border-radius: 20px;
    border: 1px solid var(--color-border-strong);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.help-tutor-free-ask::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, var(--color-accent) 0%, var(--primitive-orange-300) 100%);
    border-radius: 20px 0 0 20px;
}

.help-tutor-prompt {
    font-size: 15.5px;
    color: var(--color-text-primary);
    line-height: 1.75;
    margin: 0 0 16px 0;
}

.help-tutor-suggestions {
    background: var(--color-bg-secondary);
    border-radius: 14px;
    padding: 16px;
    margin-bottom: 16px;
    border: 1px solid var(--color-border-default);
    transition: border-color 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.help-tutor-suggestions:hover {
    border-color: var(--color-border-strong);
}

.suggestions-hint {
    font-size: 12.5px;
    color: var(--color-text-tertiary);
    margin: 0 0 10px 0;
    font-weight: 500;
    letter-spacing: 0.02em;
    text-transform: uppercase;
}

.help-tutor-suggestions ul {
    margin: 0;
    padding: 0;
    list-style: none;
}

.suggestion-item {
    padding: 9px 14px;
    font-size: 14px;
    color: var(--color-text-secondary);
    cursor: pointer;
    border-radius: 12px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.suggestion-item:hover {
    background: var(--color-accent-muted);
    color: var(--color-accent-hover);
    transform: translateX(4px);
}

.suggestion-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 2px;
    height: 0;
    background: var(--color-accent);
    border-radius: 1px;
    transition: height 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.suggestion-item:hover::before {
    height: 60%;
}

/* ========== 操作按鈕 ========== */
.help-tutor-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 18px;
}

.help-tutor-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 500;
    font-family: inherit;
    border: none;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    white-space: nowrap;
    letter-spacing: 0.01em;
}

/* 主要按鈕（品牌橘 CTA） */
.help-tutor-btn.primary {
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-hover));
    color: var(--color-text-on-accent);
    box-shadow: var(--shadow-accent);
    position: relative;
    overflow: hidden;
}

.help-tutor-btn.primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent 0%, rgba(255, 255, 255, 0.15) 50%, transparent 100%);
    transition: left 0.5s ease;
}

.help-tutor-btn.primary:hover::before {
    left: 100%;
}

.help-tutor-btn.primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(249, 115, 22, 0.35);
}

.help-tutor-btn.primary:active {
    transform: translateY(0);
    box-shadow: var(--shadow-accent);
}

/* 次要按鈕（pill 風格，有邊框） — 與 .hint-chip 一致 */
.help-tutor-btn.secondary {
    background: transparent;
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border-strong);
}

.help-tutor-btn.secondary:hover {
    color: var(--color-accent);
    border-color: var(--color-accent);
    background: var(--color-accent-muted);
    transform: translateY(-1px);
    box-shadow: 0 2px 8px var(--color-accent-subtle);
}

.help-tutor-btn.secondary:active {
    transform: translateY(0) scale(0.97);
    box-shadow: none;
}

/* 文字按鈕 */
.help-tutor-btn.text {
    background: transparent;
    color: var(--color-text-tertiary);
    padding: 10px 14px;
}

.help-tutor-btn.text:hover {
    color: var(--color-text-primary);
    background: rgba(0, 0, 0, 0.04);
}

/* ========== 深色模式支援 ========== */
[data-theme="dark"] .help-tutor-welcome {
    background: var(--color-bg-secondary);
    border-color: var(--color-bg-elevated);
    box-shadow: var(--shadow-md);
}

[data-theme="dark"] .help-tutor-welcome p {
    color: var(--color-text-primary);
}

[data-theme="dark"] .help-tutor-subtitle {
    color: var(--color-text-secondary) !important;
}

[data-theme="dark"] .help-tutor-menu,
[data-theme="dark"] .help-tutor-brief,
[data-theme="dark"] .help-tutor-detailed,
[data-theme="dark"] .help-tutor-free-ask {
    background: var(--color-bg-secondary);
    border-color: var(--color-bg-elevated);
    box-shadow: var(--shadow-md);
}

[data-theme="dark"] .help-tutor-topic-btn {
    background: var(--color-bg-tertiary);
    border-color: var(--color-bg-elevated);
    box-shadow: none;
}

[data-theme="dark"] .help-tutor-topic-btn:hover {
    background: var(--color-bg-tertiary);
    border-color: var(--color-accent);
    box-shadow: 0 6px 20px var(--color-accent-subtle);
}

[data-theme="dark"] .help-tutor-topic-btn:hover .topic-name {
    color: var(--color-accent);
}

[data-theme="dark"] .help-tutor-topic-btn .topic-name,
[data-theme="dark"] .topic-title,
[data-theme="dark"] .help-tutor-section h4 {
    color: var(--color-text-primary);
}

[data-theme="dark"] .help-tutor-description,
[data-theme="dark"] .help-tutor-steps,
[data-theme="dark"] .help-tutor-prompt {
    color: var(--primitive-stone-300);
}

[data-theme="dark"] .help-tutor-examples {
    color: var(--color-text-secondary);
}

[data-theme="dark"] .help-tutor-examples li:hover {
    color: var(--primitive-stone-300);
}

[data-theme="dark"] .help-tutor-suggestions {
    background: var(--color-bg-tertiary);
    border-color: var(--color-bg-elevated);
}

[data-theme="dark"] .help-tutor-suggestions:hover {
    border-color: var(--color-text-secondary);
}

[data-theme="dark"] .suggestions-hint {
    color: var(--color-text-secondary);
}

[data-theme="dark"] .suggestion-item {
    color: var(--primitive-stone-300);
}

[data-theme="dark"] .suggestion-item:hover {
    background: var(--color-accent-subtle);
    color: var(--color-accent);
}

[data-theme="dark"] .suggestion-item:hover::before {
    background: var(--color-accent);
}

[data-theme="dark"] .help-tutor-btn.primary {
    box-shadow: 0 2px 8px rgba(249, 115, 22, 0.25);
}

[data-theme="dark"] .help-tutor-btn.primary:hover {
    box-shadow: 0 4px 16px rgba(249, 115, 22, 0.4);
}

[data-theme="dark"] .help-tutor-btn.secondary {
    background: transparent;
    border-color: var(--color-bg-elevated);
    color: var(--primitive-stone-300);
}

[data-theme="dark"] .help-tutor-btn.secondary:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    background: var(--color-accent-subtle);
}

[data-theme="dark"] .help-tutor-btn.text {
    color: var(--color-text-secondary);
}

[data-theme="dark"] .help-tutor-btn.text:hover {
    color: var(--color-text-primary);
    background: var(--color-bg-hover);
}

/* ========== 響應式設計 ========== */
@media (max-width: 480px) {
    .help-tutor-welcome {
        padding: 24px 16px;
    }

    .help-tutor-topics {
        grid-template-columns: repeat(2, 1fr);
        gap: 8px;
    }

    .help-tutor-topic-btn {
        padding: 14px 8px;
    }

    .help-tutor-topic-btn .topic-icon {
        font-size: 24px;
    }

    .help-tutor-topic-btn .topic-name {
        font-size: 12px;
    }

    .help-tutor-menu,
    .help-tutor-brief,
    .help-tutor-detailed,
    .help-tutor-free-ask {
        padding-left: calc(16px + 10px);
        padding-right: 16px;
    }

    .help-tutor-actions {
        flex-direction: column;
    }

    .help-tutor-btn {
        width: 100%;
    }

    .topic-title {
        font-size: 16px;
    }
}

/* ========== 動畫效果 ========== */
.help-tutor-message {
    animation: helpTutorFadeIn 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes helpTutorFadeIn {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 按鈕懸停光暈效果 */
.help-tutor-topic-btn::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at center, var(--color-accent-muted) 0%, transparent 70%);
    opacity: 0;
    transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
}

.help-tutor-topic-btn:hover::after {
    opacity: 1;
}

/* 滾動條（help tutor 內部） */
.help-tutor-content::-webkit-scrollbar {
    width: 5px;
}

.help-tutor-content::-webkit-scrollbar-thumb {
    background: var(--color-scrollbar-thumb);
    border-radius: 3px;
}

.help-tutor-content::-webkit-scrollbar-thumb:hover {
    background: var(--color-scrollbar-thumb-hover);
}

[data-theme="dark"] .help-tutor-content::-webkit-scrollbar-thumb {
    background: var(--color-scrollbar-thumb);
}

[data-theme="dark"] .help-tutor-content::-webkit-scrollbar-thumb:hover {
    background: var(--color-scrollbar-thumb-hover);
}