:root {
    --bg-color: #FDFBF7;
    --text-main: #5D5D5D;
    --text-light: #9CA3AF;
    --color-pink: #FEE2E2; --color-pink-text: #991B1B;
    --color-blue: #E0F2FE; --color-blue-text: #075985;
    --color-yellow: #FEF3C7; --color-yellow-text: #92400E;
    --color-purple: #F3E8FF; --color-purple-text: #6B21A8;
    --color-green: #DCFCE7; --color-green-text: #166534;
    --color-gray: #F3F4F6; --color-gray-text: #9CA3AF;
}

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

body {
    font-family: 'Nunito', 'ZCOOL KuaiLe', cursive, sans-serif;
    background-color: var(--bg-color);
    background-image: radial-gradient(#E5E7EB 2px, transparent 2px);
    background-size: 24px 24px;
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 1200px;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    border-radius: 30px;
    padding: 30px;
    box-shadow: 0 15px 35px rgba(0,0,0,0.05);
    border: 2px solid #fff;
    position: relative;
    min-height: 600px;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    flex-wrap: wrap;
}

.title-group h1 {
    font-size: 2rem;
    color: #F472B6;
    margin-bottom: 5px;
}

.title-group p {
    font-size: 0.9rem;
    color: var(--text-light);
}

.week-selector select {
    padding: 8px 20px;
    border-radius: 40px;
    border: 2px solid #FBCFE8;
    background: #fff;
    color: var(--text-main);
    font-family: inherit;
    font-weight: bold;
    cursor: pointer;
    outline: none;
    transition: all 0.3s ease;
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
}

.week-selector select:hover {
    box-shadow: 0 4px 10px rgba(244, 114, 182, 0.2);
    border-color: #F472B6;
}

.timetable {
    display: grid;
    grid-template-columns: 60px repeat(7, 1fr);
    gap: 12px;
}

.day-header {
    text-align: center;
    padding: 10px;
    font-weight: 800;
    color: var(--text-main);
    opacity: 0.7;
}

.time-slot {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    font-size: 0.8rem;
    color: var(--text-light);
    font-weight: bold;
    min-height: 100px;
    text-align: center;
}

/* 核心动画卡片样式 */
.course {
    padding: 12px;
    border-radius: 18px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
    cursor: pointer;
    opacity: 0; /* 初始隐藏 */
    transform: scale(0.8);
    min-height: 100px;
    height: 100%;
    transition: transform 0.2s;
    background: #fff; /* Default fallback */
}

.course:hover {
    transform: translateY(-3px) scale(1.03) !important;
    z-index: 10;
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.course.empty {
    border: 2px dashed #E5E7EB;
    background: transparent;
    box-shadow: none;
    cursor: default;
}

.course.empty:hover {
    transform: none !important;
}

/* 进场动画：果冻回弹 */
@keyframes jellyPopIn {
    0% { opacity: 0; transform: scale(0.5) translateY(20px); }
    60% { opacity: 1; transform: scale(1.05) translateY(-5px); }
    100% { opacity: 1; transform: scale(1) translateY(0); }
}

.course.animate-in {
    animation: jellyPopIn 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

/* 颜色类 */
.pink { background: var(--color-pink); color: var(--color-pink-text); }
.blue { background: var(--color-blue); color: var(--color-blue-text); }
.yellow { background: var(--color-yellow); color: var(--color-yellow-text); }
.purple { background: var(--color-purple); color: var(--color-purple-text); }
.green { background: var(--color-green); color: var(--color-green-text); }

.course-name { font-weight: bold; font-size: 0.95rem; margin-bottom: 4px; line-height: 1.2; }
.course-detail { font-size: 0.75rem; opacity: 0.85; }

/* Tooltip */
.course-tooltip {
    display: none;
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    margin-bottom: 8px;
    padding: 6px 10px;
    background: rgba(0, 0, 0, 0.8);
    color: #fff;
    font-size: 0.75rem;
    border-radius: 10px;
    white-space: nowrap;
    z-index: 100;
    pointer-events: none;
}

.course-tooltip::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 5px solid transparent;
    border-top-color: rgba(0, 0, 0, 0.8);
}

.course:hover .course-tooltip {
    display: block;
}

.error {
    background: #FEE2E2;
    color: #991B1B;
    padding: 20px;
    border-radius: 20px;
    text-align: center;
    animation: jellyPopIn 0.5s ease-out forwards;
    display: none;
}

footer {
    text-align: center;
    margin-top: 30px;
    color: var(--text-light);
    font-size: 0.8rem;
}

/* 桌面端隐藏移动端专用元素 */
.date-strip,
.bottom-nav {
    display: none;
}

/* Loading Overlay */
.loading-overlay {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(255,255,255,0.9);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 20px;
    z-index: 100;
    border-radius: 30px;
    backdrop-filter: blur(8px);
}
.loading-dots {
    display: flex;
    gap: 12px;
    margin-bottom: 10px;
}

.dot-item {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    animation: bounce 0.6s alternate infinite cubic-bezier(0.5, 0.05, 1, 0.5);
}

.dot-item:nth-child(1) { background: #F472B6; animation-delay: 0s; }
.dot-item:nth-child(2) { background: #60A5FA; animation-delay: 0.15s; }
.dot-item:nth-child(3) { background: #FBBF24; animation-delay: 0.3s; }
.dot-item:nth-child(4) { background: #A78BFA; animation-delay: 0.45s; }

@keyframes bounce {
    0% { transform: translateY(0) scale(1); opacity: 0.8; }
    100% { transform: translateY(-20px) scale(1.1); opacity: 1; }
}

.loading-text {
    font-size: 1.2rem;
    color: #F472B6;
    font-weight: bold;
    display: flex;
    align-items: center;
    gap: 2px;
}

.loading-text .dot {
    animation: blink 1.4s infinite;
    opacity: 0;
}

.loading-text .dot:nth-child(2) { animation-delay: 0.2s; }
.loading-text .dot:nth-child(3) { animation-delay: 0.4s; }
.loading-text .dot:nth-child(4) { animation-delay: 0.6s; }

@keyframes blink {
    0%, 20% { opacity: 0; }
    40% { opacity: 1; }
    100% { opacity: 0; }
}

/* ==================== 移动端布局 ==================== */
@media (max-width: 768px) {
    :root {
        /* 定义统一的列宽比例，确保日期栏和课程表完全对齐 */
        --mobile-time-col: 45px;
        --mobile-day-cols: repeat(7, minmax(0, 1fr));
    }

    body {
        padding: 0;
        align-items: flex-start;
        background: #F5F5F7;
        background-image: none;
    }

    .container {
        max-width: 100%;
        width: 100%;
        min-height: 100vh;
        border-radius: 0;
        padding: 0;
        box-shadow: none;
        border: none;
        background: #F5F5F7;
        display: flex;
        flex-direction: column;
    }

    /* 顶部信息栏 */
    header {
        background: #fff;
        padding: 15px 16px 10px;
        margin-bottom: 0;
        border-bottom: 1px solid #E5E7EB;
        flex-wrap: nowrap;
    }

    .title-group h1 {
        font-size: 1.3rem;
        margin-bottom: 2px;
    }

    .title-group p {
        font-size: 0.75rem;
    }

    .week-selector select {
        padding: 6px 12px;
        font-size: 0.85rem;
    }

    /* 日期导航栏（吸顶）- 使用统一的 CSS 变量确保对齐 */
    .date-strip {
        display: grid !important;
        grid-template-columns: var(--mobile-time-col) var(--mobile-day-cols);
        gap: 2px;
        background: #fff;
        padding: 8px 4px;
        position: sticky;
        top: 0;
        z-index: 40;
        border-bottom: 1px solid #E5E7EB;
        box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    }

    .date-strip .time-label {
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 0.7rem;
        color: var(--text-light);
        font-weight: bold;
    }

    .date-item {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        padding: 6px 2px;
        border-radius: 12px;
        transition: all 0.2s;
        min-width: 0; /* 防止内容溢出 */
    }

    .date-item .weekday {
        font-size: 0.7rem;
        color: var(--text-light);
        margin-bottom: 2px;
        white-space: nowrap;
    }

    .date-item .date-num {
        font-size: 0.9rem;
        font-weight: bold;
        color: var(--text-main);
    }

    .date-item.today {
        background: #1F2937;
        color: #fff;
    }

    .date-item.today .weekday,
    .date-item.today .date-num {
        color: #fff;
    }

    /* 主课程表网格 - 使用相同的 CSS 变量确保列宽一致 */
    .timetable {
        display: grid;
        grid-template-columns: var(--mobile-time-col) var(--mobile-day-cols);
        gap: 2px;
        padding: 0;
        background: #E5E7EB;
        flex: 1;
        align-content: start;
    }

    /* 隐藏原有的 day-header */
    .day-header {
        display: none;
    }

    /* 时间轴 */
    .time-slot {
        background: #fff;
        font-size: 0.65rem;
        padding: 8px 4px;
        min-height: 90px;
        border-radius: 0;
        display: flex;
        flex-direction: column;
        justify-content: flex-start;
        align-items: center;
        gap: 2px;
    }

    /* 课程卡片：不要在移动端强制覆盖背景色，保留颜色类(pink/blue/...)的填充 */
    .course {
        border-radius: 8px;
        padding: 8px;
        min-height: 90px;
        font-size: 0.7rem;
        box-shadow: none;
        border: none;
    }

    .course.empty {
        background: #fff;
        border: none;
        display: block;
    }

    .course:hover {
        transform: none !important;
        box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    }

    .course-name {
        font-size: 0.65rem;
        margin-bottom: 3px;
        line-height: 1.3;
        word-break: break-word;
    }

    .course-detail {
        font-size: 0.6rem;
        line-height: 1.4;
    }

    /* Tooltip 在移动端禁用 */
    .course-tooltip {
        display: none !important;
    }

    /* 底部导航栏 */
    .bottom-nav {
        display: grid !important;
        grid-template-columns: repeat(4, 1fr);
        background: #fff;
        border-top: 1px solid #E5E7EB;
        padding: 8px 0;
        position: sticky;
        bottom: 0;
        z-index: 50;
    }

    .nav-item {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 4px;
        color: var(--text-light);
        text-decoration: none;
        transition: color 0.2s;
        padding: 4px;
    }

    .nav-item.active {
        color: #1F2937;
    }

    .nav-icon {
        font-size: 1.4rem;
    }

    .nav-label {
        font-size: 0.7rem;
        font-weight: 600;
    }

    footer {
        display: none;
    }

    /* Loading 适配 */
    .loading-overlay {
        border-radius: 0;
    }

    /* 错误提示适配 */
    .error {
        margin: 16px;
        border-radius: 12px;
    }
}

/* 周末提示样式 */
.weekend-notification {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 600;
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
    z-index: 1000;
    animation: slideDown 0.3s ease-out;
    display: none;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}