/* 全域重置與變數 */
:root {
    --primary: #6366f1;         /* Indigo 500 */
    --primary-dark: #4f46e5;    /* Indigo 600 */
    --secondary: #64748b;      /* Slate 500 */
    --bg-main: #f8fafc;        /* Slate 50 */
    --bg-sidebar: #0f172a;     /* Slate 900 */
    --bg-card: #ffffff;
    --text-main: #1e293b;      /* Slate 800 */
    --text-muted: #64748b;
    --success: #10b981;        /* Emerald 500 */
    --warning: #f59e0b;        /* Amber 500 */
    --danger: #ef4444;         /* Red 500 */
    --border: #e2e8f0;         /* Slate 200 */
}

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

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

/* 整體佈局 */
.app-wrapper {
    display: flex;
    min-height: 100vh;
}

/* 側邊欄樣式 */
.sidebar {
    width: 260px;
    background: var(--bg-sidebar);
    color: white;
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    z-index: 100;
}

.sidebar-header {
    padding: 40px 24px;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.sidebar-header h2 {
    font-size: 1.25rem;
    font-weight: 800;
    letter-spacing: 0.05em;
    color: #f8fafc;
    display: flex;
    align-items: center;
    gap: 10px;
}

.sidebar-header h2::before {
    content: '⏱️';
}

.sidebar-nav {
    flex-grow: 1;
    padding: 24px 12px;
}

.sidebar-nav ul {
    list-style: none;
}

.sidebar-nav li {
    margin-bottom: 8px;
}

.sidebar-nav a {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    color: #94a3b8;
    text-decoration: none;
    border-radius: 10px;
    transition: all 0.2s;
    font-weight: 500;
}

.sidebar-nav .icon {
    margin-right: 12px;
    font-size: 1.1em;
}

.sidebar-nav li.active a {
    background: rgba(99, 102, 241, 0.15);
    color: var(--primary);
    box-shadow: inset 0 0 0 1px rgba(99, 102, 241, 0.2);
}

.sidebar-nav li:not(.disabled) a:hover {
    background: rgba(255, 255, 255, 0.05);
    color: white;
}

.sidebar-nav li.disabled a {
    opacity: 0.4;
    cursor: not-allowed;
}

/* 主內容區 */
.main-content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px;
    background-image: radial-gradient(at 0% 0%, rgba(99, 102, 241, 0.05) 0px, transparent 50%), 
                      radial-gradient(at 100% 100%, rgba(99, 102, 241, 0.05) 0px, transparent 50%);
}

.container {
    background: var(--bg-card);
    border-radius: 24px;
    padding: 48px;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
    text-align: center;
    width: 100%;
    max-width: 520px;
    border: 1px solid var(--border);
}

h1 {
    color: var(--text-main);
    margin-bottom: 32px;
    font-size: 1.875rem;
    font-weight: 700;
}

/* 設定區 */
.settings {
    margin-bottom: 40px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.input-group {
    display: flex;
    flex-direction: column;
    text-align: left;
    gap: 8px;
}

.input-group label {
    font-weight: 600;
    color: var(--text-muted);
    font-size: 0.875rem;
    padding-left: 4px;
}

.input-group input {
    padding: 12px;
    background: #f1f5f9;
    border: 1px solid var(--border);
    border-radius: 12px;
    width: 100%;
    text-align: center;
    font-size: 1rem;
    font-weight: 600;
    transition: all 0.2s;
    color: var(--text-main);
}

.input-group input:focus {
    outline: none;
    border-color: var(--primary);
    background: white;
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

/* 時間顯示區 */
.timer-display {
    margin: 48px 0;
}

.time {
    font-size: 5rem;
    font-weight: 800;
    color: var(--text-main);
    margin-bottom: 24px;
    font-variant-numeric: tabular-nums;
    letter-spacing: -0.02em;
}

.time.warning {
    color: var(--danger);
}

.progress-bar {
    width: 100%;
    height: 10px;
    background-color: #f1f5f9;
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 8px;
}

.progress {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), #8b5cf6);
    transition: width 0.3s ease;
}

/* 控制按鈕 */
.controls {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin-bottom: 24px;
}

.btn {
    padding: 14px 28px;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    filter: grayscale(1);
}

.btn.start {
    background-color: var(--primary);
    color: white;
    box-shadow: 0 4px 6px -1px rgba(99, 102, 241, 0.2);
}

.btn.start:hover:not(:disabled) {
    background-color: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 10px 15px -3px rgba(99, 102, 241, 0.3);
}

.btn.pause {
    background-color: white;
    color: var(--warning);
    border: 2px solid var(--warning);
}

.btn.pause:hover:not(:disabled) {
    background-color: #fffbeb;
    transform: translateY(-1px);
}

.btn.reset {
    background-color: white;
    color: var(--text-muted);
    border: 2px solid var(--border);
}

.btn.reset:hover {
    background-color: #f8fafc;
    border-color: var(--secondary);
    color: var(--text-main);
}

/* 狀態顯示 */
.status {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-muted);
    padding: 12px;
    border-radius: 12px;
    display: inline-block;
    min-width: 180px;
}

.status.running { color: var(--primary); }
.status.paused { color: var(--warning); }
.status.notification { color: var(--danger); }
.status.completed { color: var(--success); }

/* 分頁切換 */
.page-container {
    display: none;
    width: 100%;
    animation: fadeIn 0.3s ease-in-out;
}

.page-container.active {
    display: flex;
    flex-direction: column;
    align-items: center;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* 困拉計時器網格 */
.page-header {
    text-align: center;
    margin-bottom: 40px;
    color: white;
}

.page-header h1 {
    color: white;
    margin-bottom: 10px;
}

.subtitle {
    opacity: 0.8;
    font-weight: 500;
}

.timers-grid {
    display: flex;
    flex-direction: column;
    gap: 24px;
    width: 100%;
    max-width: 850px; /* 增加寬度以避免內容擁擠 */
    padding: 20px;
}

/* 計時器卡片 */
.timer-card {
    background: white;
    border-radius: 20px;
    padding: 32px; /* 增加內距 */
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 40px; /* 增加左右間距 */
    border: 1px solid var(--border);
    transition: all 0.2s;
    width: 100%;
}

.timer-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0,0,0,0.12);
}

/* 左側佈局 */
.timer-card-left {
    width: 200px; /* 稍微增加左側寬度以適應大字體 */
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.timer-card-time {
    font-size: 4rem; /* 稍微調大字體，配合更大的卡片 */
    font-weight: 800;
    font-variant-numeric: tabular-nums;
    color: var(--text-main);
    line-height: 1;
    margin-bottom: 16px;
}

.timer-card-left .progress-bar {
    margin-bottom: 0; /* 在左右佈局中，進度條不需要下方邊距 */
}

/* 右側佈局 */
.timer-card-right {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 16px;
    text-align: left;
}

.timer-card-header {
    border-bottom: none;
    padding-bottom: 0;
}

.timer-card-header h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
}

.timer-card-settings {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.mini-input-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.mini-input-group label {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-muted);
}

.mini-input-group input {
    padding: 8px;
    background: #f1f5f9;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    text-align: center;
    transition: all 0.2s;
}

.mini-input-group input:focus {
    background: white;
    border-color: var(--primary);
    outline: none;
}

.timer-card-text input {
    width: 100%;
    padding: 8px 12px;
    background: #f1f5f9;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.9rem;
    transition: all 0.2s;
}

.timer-card-text input:focus {
    background: white;
    border-color: var(--primary);
    outline: none;
}

.timer-card-controls {
    display: flex;
    gap: 8px;
}

.btn-mini {
    flex: 1;
    padding: 10px;
    border: none;
    border-radius: 10px;
    font-size: 0.875rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-mini.start { background: var(--primary); color: white; }
.btn-mini.pause { background: #fff7ed; color: var(--warning); border: 1px solid #fed7aa; }
.btn-mini.reset { background: white; color: var(--text-muted); border: 1px solid var(--border); }

.btn-mini:hover:not(:disabled) { transform: translateY(-1px); }
.btn-mini:disabled { opacity: 0.4; cursor: not-allowed; }

/* 響應式設計修正 */
@media (max-width: 600px) {
    .settings {
        grid-template-columns: 1fr;
    }

    .timer-card {
        flex-direction: column;
        gap: 20px;
        text-align: center;
        padding: 24px 16px;
    }
    
    .timer-card-left {
        width: 100%;
    }
    
    .timer-card-right {
        width: 100%;
        text-align: center;
    }

    .timer-card-settings {
        grid-template-columns: 1fr;
    }
}

/* 響應式設計 */
@media (max-width: 768px) {
    .app-wrapper {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
    }

    .sidebar-header {
        padding: 20px;
        text-align: left;
    }

    .sidebar-nav {
        padding: 8px;
    }

    .sidebar-nav ul {
        display: flex;
        gap: 8px;
        overflow-x: auto;
    }

    .sidebar-nav li {
        margin-bottom: 0;
        flex-shrink: 0;
    }

    .sidebar-nav a {
        padding: 10px 16px;
        white-space: nowrap;
    }

    .sidebar-nav li.active a {
        border-left: none;
        background: var(--primary);
        color: white;
    }

    .main-content {
        padding: 20px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 32px 20px;
    }

    .time {
        font-size: 4rem;
    }

    .settings {
        grid-template-columns: 1fr;
    }
}