/* ==========================================================================
   阿凱簡報系統 (Akai Slide Studio) - 系統核心樣式表 (完整展開版)
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Noto+Sans+TC:wght@400;500;700&display=swap');

/* --- 1. CSS 變數 (Design Tokens) --- */
:root {
    --sys-primary: #4f46e5;
    --sys-primary-hover: #4338ca;
    --sys-secondary: #f1f5f9;
    --sys-secondary-hover: #e2e8f0;
    --sys-danger: #ef4444;
    
    --sys-bg: #f8fafc;
    --sys-surface: #ffffff;
    --sys-sidebar-bg: #1e293b;
    
    --sys-text-main: #0f172a;
    --sys-text-muted: #64748b;
    --sys-text-light: #f8fafc;
    
    --sys-border: #e2e8f0;
    --sys-radius: 8px;
    --sys-radius-lg: 12px;
    --sys-shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --sys-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    
    --sys-font: 'Inter', 'Noto Sans TC', sans-serif;
}

/* --- 2. 基礎重置 (Reset) --- */
* { 
    margin: 0; 
    padding: 0; 
    box-sizing: border-box; 
}

body { 
    font-family: var(--sys-font); 
    background-color: var(--sys-bg); 
    color: var(--sys-text-main); 
    line-height: 1.5; 
    overflow: hidden; 
}

.screen { 
    display: none; 
    height: 100vh; 
    width: 100vw; 
    flex-direction: column; 
}

.screen.active { 
    display: flex; 
}

/* --- 3. 通用按鈕元件 --- */
button { 
    font-family: inherit; 
    cursor: pointer; 
    border: none; 
    border-radius: var(--sys-radius); 
    padding: 8px 16px; 
    font-size: 14px; 
    font-weight: 500; 
    transition: all 0.2s ease; 
}

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

.btn-secondary { background-color: var(--sys-secondary); color: var(--sys-text-main); border: 1px solid var(--sys-border); }
.btn-secondary:hover { background-color: var(--sys-secondary-hover); }

.btn-danger { background-color: transparent; color: var(--sys-danger); border: 1px solid var(--sys-danger); }
.btn-danger:hover { background-color: var(--sys-danger); color: white; }

.btn-icon { background: transparent; border-radius: 4px; padding: 4px 8px; font-size: 16px; }
.btn-icon:hover { background-color: rgba(255,255,255,0.1); }

.btn-text { background: transparent; color: var(--sys-text-muted); padding: 4px 8px; }
.btn-text:hover { color: var(--sys-text-main); }

/* --- 4. 畫面一：密碼驗證區 --- */
#auth-screen { 
    justify-content: center; 
    align-items: center; 
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%); 
}

.auth-box { 
    background: var(--sys-surface); 
    padding: 40px; 
    border-radius: var(--sys-radius-lg); 
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1); 
    text-align: center; 
    width: 100%; 
    max-width: 400px; 
}

.auth-box h2 { margin-bottom: 8px; color: var(--sys-text-main); }
.auth-box p { color: var(--sys-text-muted); font-size: 14px; margin-bottom: 24px; }
.auth-box input { 
    width: 100%; 
    padding: 12px; 
    border: 2px solid var(--sys-border); 
    border-radius: var(--sys-radius); 
    margin-bottom: 16px; 
    font-size: 16px; 
    text-align: center; 
    outline: none; 
}
.auth-box input:focus { border-color: var(--sys-primary); }
.auth-box button { width: 100%; padding: 12px; font-size: 16px; }
.error-text { color: var(--sys-danger) !important; margin-top: 12px; height: 20px; }

/* --- 5. 頂部導覽列 --- */
.sys-header { 
    height: 60px; 
    background-color: var(--sys-surface); 
    border-bottom: 1px solid var(--sys-border); 
    display: flex; 
    align-items: center; 
    justify-content: space-between; 
    padding: 0 24px; 
    flex-shrink: 0; 
}

.sys-header h1 { font-size: 18px; color: var(--sys-text-main); }
.header-left, .header-actions { display: flex; align-items: center; gap: 12px; }

.project-title-input { 
    border: 1px solid transparent; 
    padding: 4px 8px; 
    font-size: 16px; 
    font-weight: 600; 
    border-radius: 4px; 
    background: transparent; 
    color: var(--sys-text-main); 
    width: 200px; 
}
.project-title-input:focus, .project-title-input:hover { 
    border-color: var(--sys-border); 
    background: var(--sys-surface); 
    outline: none; 
}

/* --- 6. 畫面二：儀表板 --- */
.dashboard-content { 
    padding: 40px; 
    overflow-y: auto; 
    flex: 1; 
}

.project-grid { 
    display: grid; 
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); 
    gap: 24px; 
    max-width: 1200px; 
    margin: 0 auto; 
}

.project-card { 
    background: var(--sys-surface); 
    border: 1px solid var(--sys-border); 
    border-radius: var(--sys-radius-lg); 
    padding: 24px; 
    cursor: pointer; 
    transition: all 0.2s ease; 
    display: flex; 
    flex-direction: column; 
    min-height: 160px; 
    box-shadow: var(--sys-shadow-sm); 
}

.project-card:hover { 
    transform: translateY(-4px); 
    box-shadow: var(--sys-shadow); 
    border-color: var(--sys-primary); 
}

.project-card.add-new { 
    border: 2px dashed #cbd5e1; 
    background: transparent; 
    align-items: center; 
    justify-content: center; 
    color: var(--sys-text-muted); 
}
.project-card.add-new:hover { 
    border-color: var(--sys-primary); 
    color: var(--sys-primary); 
    background: rgba(79, 70, 229, 0.05); 
}

.project-card.add-new .icon { font-size: 32px; margin-bottom: 8px; }
.card-title { font-size: 18px; font-weight: 600; margin-bottom: 8px; color: var(--sys-text-main); }
.card-meta { font-size: 12px; color: var(--sys-text-muted); margin-top: auto; }
.card-actions { 
    display: flex; 
    gap: 8px; 
    margin-top: 12px; 
    border-top: 1px solid var(--sys-border); 
    padding-top: 12px; 
}

/* --- 7. 畫面三：編輯器佈局 --- */
.editor-layout { 
    display: flex; 
    flex: 1; 
    overflow: hidden; 
}

/* 7.1 左側欄：投影片與主題清單 */
.sidebar { 
    width: 260px; 
    background-color: var(--sys-sidebar-bg); 
    color: var(--sys-text-light); 
    display: flex; 
    flex-direction: column; 
    flex-shrink: 0; 
}

.sidebar-header { 
    padding: 16px; 
    display: flex; 
    justify-content: space-between; 
    align-items: center; 
    border-bottom: 1px solid rgba(255,255,255,0.05); 
}

.sidebar-header h3 { 
    font-size: 12px; 
    text-transform: uppercase; 
    letter-spacing: 0.05em; 
    color: #94a3b8; 
}

/* 主題設定區塊 */
.theme-settings { 
    padding: 12px 16px; 
    border-bottom: 1px solid rgba(255,255,255,0.1); 
    background: rgba(0,0,0,0.15); 
}

.color-picker-group { 
    display: flex; 
    justify-content: space-between; 
    align-items: center; 
    margin-bottom: 8px; 
}

.color-picker-group label { font-size: 13px; color: #cbd5e1; }
.color-picker-group input[type="color"] { 
    width: 28px; 
    height: 28px; 
    border: none; 
    border-radius: 4px; 
    cursor: pointer; 
    background: transparent; 
    padding: 0; 
}

.color-picker-group input[type="color"]::-webkit-color-swatch-wrapper { padding: 0; }
.color-picker-group input[type="color"]::-webkit-color-swatch { 
    border: 1px solid rgba(255,255,255,0.2); 
    border-radius: 4px; 
}

.slide-list { 
    list-style: none; 
    overflow-y: auto; 
    flex: 1; 
    padding: 12px; 
}

.slide-item { 
    padding: 12px; 
    background: rgba(255,255,255,0.05); 
    border-radius: var(--sys-radius); 
    margin-bottom: 8px; 
    cursor: pointer; 
    display: flex; 
    justify-content: space-between; 
    align-items: center; 
    border: 1px solid transparent; 
    transition: background 0.2s; 
}

.slide-item:hover { background: rgba(255,255,255,0.1); }
.slide-item.active { background: rgba(79, 70, 229, 0.2); border-color: var(--sys-primary); }
.slide-label { font-size: 14px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.delete-slide-btn { 
    background: none; 
    border: none; 
    color: #ef4444; 
    cursor: pointer; 
    opacity: 0; 
    transition: opacity 0.2s; 
}
.slide-item:hover .delete-slide-btn { opacity: 1; }

/* 7.2 中間欄：編輯表單 */
.editor-panel { 
    width: 360px; 
    background-color: var(--sys-surface); 
    border-right: 1px solid var(--sys-border); 
    display: flex; 
    flex-direction: column; 
    flex-shrink: 0; 
    overflow-y: auto; 
}

.empty-state { 
    padding: 40px 24px; 
    text-align: center; 
    color: var(--sys-text-muted); 
    font-size: 14px; 
}

.editor-form { padding: 24px; }
.form-group { margin-bottom: 20px; }
.form-group label { 
    display: block; 
    font-size: 13px; 
    font-weight: 600; 
    color: var(--sys-text-muted); 
    margin-bottom: 8px; 
}

.form-group input, 
.form-group select, 
.form-group textarea { 
    width: 100%; 
    padding: 10px; 
    border: 1px solid var(--sys-border); 
    border-radius: var(--sys-radius); 
    font-family: inherit; 
    font-size: 14px; 
    outline: none; 
    background: var(--sys-bg); 
}

.form-group input:focus, 
.form-group select:focus, 
.form-group textarea:focus { 
    border-color: var(--sys-primary); 
    background: var(--sys-surface); 
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1); 
}

.form-group textarea { resize: vertical; min-height: 150px; }
.form-group .hint { display: block; font-size: 12px; color: #94a3b8; margin-top: 4px; }

/* 7.3 右側欄：即時預覽區 */
.preview-panel { 
    flex: 1; 
    display: flex; 
    flex-direction: column; 
    background-color: #e2e8f0; 
    transition: all 0.3s ease; 
}

.preview-header { 
    height: 40px; 
    background: var(--sys-surface); 
    border-bottom: 1px solid var(--sys-border); 
    display: flex; 
    align-items: center; 
    padding: 0 16px; 
    font-size: 12px; 
    color: var(--sys-text-muted); 
    font-weight: 600; 
}

.preview-container { 
    flex: 1; 
    padding: 40px; 
    display: flex; 
    justify-content: center; 
    align-items: flex-start; 
    overflow-y: auto; 
}

#preview-frame { 
    width: 100%; 
    max-width: 1280px; 
    aspect-ratio: 16 / 9; 
    border: none; 
    background: white; 
    border-radius: 12px; 
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25); 
    display: block; 
}

/* 8. M 鍵全螢幕模式 */
.preview-panel.fullscreen-mode { 
    position: fixed; 
    top: 0; 
    left: 0; 
    width: 100vw; 
    height: 100vh; 
    z-index: 9999; 
    padding: 0; 
    background: #000; 
}

.preview-panel.fullscreen-mode .preview-header { display: none; }
.preview-panel.fullscreen-mode .preview-container { padding: 0; height: 100%; align-items: center; }
.preview-panel.fullscreen-mode #preview-frame { height: 100%; max-height: none; border-radius: 0; }