/* ==================== Apple 风格设计系统 ==================== */
:root {
    /* 主色调 */
    --bg-primary: #FFFFFF;
    --bg-secondary: #F5F5F7;
    --text-primary: #1D1D1F;
    --text-secondary: #6E6E73;
    --text-tertiary: #86868B;
    --accent: #007AFF;
    --accent-hover: #0051D5;

    /* 状态色 */
    --success: #34C759;
    --warning: #FF9500;
    --error: #FF3B30;

    /* 边框与分割 */
    --border: #D2D2D7;
    --divider: #E8E8ED;

    /* 卡片 */
    --card-bg: #FFFFFF;
    --card-radius: 16px;
    --card-shadow: 0 2px 8px rgba(0,0,0,0.04);
    --card-shadow-hover: 0 8px 24px rgba(0,0,0,0.12);

    /* 字体 */
    --font: -apple-system, "PingFang SC", "Helvetica Neue", "SF Pro Display", sans-serif;
    --text-hero: 48px;
    --text-title: 28px;
    --text-heading: 22px;
    --text-body: 17px;
    --text-caption: 14px;
    --text-small: 12px;

    /* 动画 */
    --ease: cubic-bezier(0.4, 0, 0.2, 1);
    --duration: 0.3s;

    /* 布局 */
    --sidebar-width: 192px;
    --header-height: 52px;
    --content-max: 980px;
}

/* ==================== 全局重置 ==================== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: var(--text-body);
    line-height: 1.5;
    overflow-x: hidden;
    touch-action: manipulation;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ==================== 侧边栏 ==================== */
.sidebar {
    position: fixed;
    left: calc(-1 * var(--sidebar-width));
    top: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: rgba(255,255,255,0.88);
    backdrop-filter: saturate(180%) blur(24px);
    -webkit-backdrop-filter: saturate(180%) blur(24px);
    border: 1px solid rgba(0,0,0,0.06);
    border-left: none;
    border-radius: 0 18px 18px 0;
    box-shadow: 0 8px 40px rgba(0,0,0,0.12), 0 2px 8px rgba(0,0,0,0.06);
    transition: left var(--duration) var(--ease);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sidebar.active {
    left: 0;
}

.sidebar-header {
    padding: 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.sidebar-header h2 {
    font-size: 17px;
    font-weight: 600;
    color: var(--text-primary);
}

.close-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 6px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--duration) var(--ease);
}

.close-btn:hover {
    background: var(--bg-secondary);
}

.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    padding: 4px 10px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 12px;
    color: var(--text-primary);
    text-decoration: none;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 400;
    transition: all var(--duration) var(--ease);
    margin-bottom: 1px;
}

.nav-item:hover {
    background: rgba(0,0,0,0.04);
}

.nav-item.active {
    background: var(--accent);
    color: #fff;
}

.nav-item.active .nav-icon {
    stroke: #fff;
}

.nav-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    stroke: var(--text-secondary);
    transition: stroke var(--duration) var(--ease);
}

.sidebar-footer {
    padding: 12px 14px;
}

.rebind-btn {
    width: 100%;
    padding: 9px;
    background: none;
    color: var(--error);
    border: 1px solid var(--error);
    border-radius: 10px;
    cursor: pointer;
    font-size: var(--text-caption);
    font-weight: 500;
    margin-bottom: 8px;
    transition: all var(--duration) var(--ease);
}

.rebind-btn:hover {
    background: var(--error);
    color: #fff;
}

.user-info {
    font-size: var(--text-small);
    color: var(--text-tertiary);
    text-align: center;
}

/* ==================== 主内容区域 ==================== */
.main-content {
    min-height: 100vh;
    transition: margin-left var(--duration) var(--ease);
}

/* ==================== 顶部导航栏（毛玻璃） ==================== */
.header {
    background: rgba(255,255,255,0.72);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--divider);
    padding: 0 20px;
    height: var(--header-height);
    display: flex;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

.menu-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    margin-right: 12px;
    display: flex;
    flex-direction: column;
    gap: 5px;
    border-radius: 8px;
    transition: background var(--duration) var(--ease);
}

.menu-btn:hover {
    background: var(--bg-secondary);
}

.menu-btn span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 1px;
    transition: var(--duration) var(--ease);
}

#page-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

/* 登录状态指示器 */
.login-status-indicator {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: var(--text-small);
    padding: 5px 12px;
    background: var(--bg-secondary);
    border-radius: 20px;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
}

.status-dot.status-online {
    background: var(--success);
    box-shadow: 0 0 6px rgba(52,199,89,0.5);
}

.status-dot.status-offline {
    background: var(--error);
}

.status-dot.status-checking {
    background: var(--accent);
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.status-text {
    color: var(--text-secondary);
    font-weight: 500;
    white-space: nowrap;
}

/* ==================== 内容区域 ==================== */
.content-wrapper {
    padding: 20px;
    max-width: var(--content-max);
    margin: 0 auto;
}

/* ==================== 页面切换动画 ==================== */
.page {
    display: none;
    animation: fadeInUp var(--duration) var(--ease);
}

.page.active {
    display: block;
}

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

/* ==================== 通用卡片 ==================== */
.card {
    background: var(--card-bg);
    border-radius: var(--card-radius);
    padding: 24px;
    box-shadow: var(--card-shadow);
    transition: box-shadow var(--duration) var(--ease);
}

.card h2 {
    font-size: var(--text-heading);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 20px;
}

/* ==================== 通用按钮 ==================== */
.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0 24px;
    height: 44px;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 12px;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s var(--ease);
    white-space: nowrap;
}

.btn-primary:hover {
    background: var(--accent-hover);
}

.btn-primary:active {
    transform: scale(0.98);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.btn-primary.btn-full {
    width: 100%;
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0 20px;
    height: 44px;
    background: transparent;
    color: var(--accent);
    border: 1px solid var(--border);
    border-radius: 12px;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s var(--ease);
    white-space: nowrap;
}

.btn-secondary:hover {
    background: var(--bg-secondary);
}

.btn-secondary:active {
    transform: scale(0.98);
}

.btn-secondary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-sm {
    height: 36px;
    padding: 0 16px;
    font-size: var(--text-caption);
    border-radius: 10px;
}

/* 图标按钮 */
.icon-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--duration) var(--ease);
    color: var(--text-secondary);
}

.icon-btn:hover {
    background: var(--bg-secondary);
}

.icon-btn svg {
    width: 20px;
    height: 20px;
}

/* 操作栏 */
.action-bar {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-top: 20px;
}

/* ==================== 首页：紧急事项 ==================== */
.urgent-card {
    padding: 24px;
}

.urgent-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.urgent-header h2 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0;
}

.refresh-btn svg {
    transition: transform 0.6s var(--ease);
}

.refresh-btn:active svg {
    transform: rotate(360deg);
}

.urgent-content {
    min-height: 180px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.event-card {
    background: #fff;
    color: var(--text-primary);
    padding: 28px;
    border-radius: 14px;
    text-align: center;
    border: 1px solid var(--border);
}

.event-card-current {
    border-left: 4px solid #2d8cf0;
}

.event-card-next {
    padding: 20px;
    background: var(--bg-secondary, #f8f9fa);
}

.event-card-next .event-title {
    font-size: 18px;
    margin-bottom: 10px;
}

.event-card-next .countdown {
    font-size: 28px;
}

.event-card-next .event-location {
    font-size: 15px;
    padding: 8px 16px;
}

.event-card-upcoming {
    background: var(--bg-secondary, #f8f9fa);
}

.event-card-upcoming .event-title {
    font-size: 20px;
    margin-bottom: 10px;
}

.event-card-upcoming .event-location {
    font-size: 15px;
    padding: 8px 16px;
}

.event-time-label {
    font-size: 22px;
    font-weight: 700;
    color: var(--accent, #2d8cf0);
    margin-top: 10px;
    letter-spacing: 0.3px;
}

.rest-message {
    text-align: center;
    color: var(--text-secondary);
    font-size: 15px;
    padding: 12px 0 4px;
    margin: 0 0 8px;
}

.event-type {
    font-size: var(--text-caption);
    color: var(--text-tertiary);
    margin-bottom: 8px;
    font-weight: 500;
}

.event-title {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 16px;
    letter-spacing: -0.3px;
    color: var(--text-primary);
}

.event-location {
    font-size: 18px;
    margin-bottom: 12px;
    font-weight: 600;
    background: #eef4ff;
    color: #2d8cf0;
    padding: 12px 20px;
    border-radius: 10px;
    display: inline-block;
    letter-spacing: 0.5px;
}

.event-time {
    font-size: var(--text-caption);
    color: var(--text-tertiary);
    margin-bottom: 20px;
}

.countdown {
    font-size: 40px;
    font-weight: 700;
    letter-spacing: -1px;
    margin-bottom: 4px;
    color: #2d8cf0;
}

.countdown-label {
    font-size: var(--text-caption);
    color: var(--text-tertiary);
}

.event-seat {
    margin-top: 16px;
    padding: 12px 20px;
    background: #fff7ed;
    color: #e67e22;
    border-radius: 10px;
    font-size: 18px;
    font-weight: 600;
    display: inline-block;
    letter-spacing: 0.5px;
}

/* ==================== 课程表 ==================== */
.schedule-container {
    padding: 20px;
}

.week-selector {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 20px;
    padding: 12px 16px;
    background: var(--bg-secondary);
    border-radius: 12px;
}

.current-week {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
}

/* 课程表提示消息 */
.schedule-message {
    text-align: center;
    padding: 10px 16px;
    margin-bottom: 8px;
    border-radius: 8px;
    font-size: 13px;
    background: var(--bg-secondary);
    color: var(--text-secondary);
}

.schedule-message-error {
    background: rgba(239, 68, 68, 0.08);
    color: var(--error);
}

/* 课程表头部 */
.schedule-header {
    display: grid;
    grid-template-columns: 70px repeat(7, 1fr);
    gap: 6px;
    margin-bottom: 8px;
}

.schedule-header-day {
    text-align: center;
    font-weight: 600;
    color: var(--accent);
    padding: 6px 4px;
    background: rgba(0,122,255,0.06);
    border-radius: 8px;
    font-size: var(--text-caption);
}

.schedule-day-name {
    line-height: 1.2;
}

.schedule-day-date {
    font-size: 10px;
    font-weight: 400;
    color: var(--text-tertiary);
    line-height: 1.2;
    margin-top: 1px;
}

.schedule-day-today {
    background: var(--accent);
    color: #fff;
}

.schedule-day-today .schedule-day-date {
    color: rgba(255,255,255,0.75);
}

/* 周选择下拉框 */
.week-select {
    appearance: none;
    -webkit-appearance: none;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 8px;
    padding: 6px 28px 6px 12px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    outline: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 8px center;
}

/* 课程表网格 */
.schedule-grid {
    display: grid;
    grid-template-columns: 70px 1fr;
    gap: 8px;
}

.schedule-timeline {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.timeline-item {
    height: 76px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background: var(--bg-secondary);
    border-radius: 8px;
    padding: 4px;
}

.timeline-section {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.timeline-time-start,
.timeline-time-end {
    font-size: 10px;
    color: var(--text-tertiary);
    white-space: nowrap;
}

.schedule-days {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 6px;
    position: relative;
}

.schedule-day-column {
    position: relative;
    min-height: 660px;
}

.timeline-item-evening {
    display: none;
}

.schedule-grid.has-evening .timeline-item-evening {
    display: flex;
}

.schedule-grid.has-evening .schedule-day-column {
    min-height: 814px;
}

/* 隐藏周末 */
.schedule-header.no-weekend {
    grid-template-columns: 70px repeat(5, 1fr);
}

.schedule-header.no-weekend .schedule-header-weekend {
    display: none;
}

.no-weekend .schedule-days {
    grid-template-columns: repeat(5, 1fr);
}

.no-weekend .schedule-day-weekend {
    display: none;
}

/* 课程卡片 */
.course-card {
    border-radius: 10px;
    padding: 8px 6px;
    color: #fff;
    font-size: 12px;
    cursor: pointer;
    transition: all 0.2s var(--ease);
    box-shadow: 0 1px 4px rgba(0,0,0,0.1);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    justify-content: center;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.course-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--card-shadow-hover);
}

.course-card-name {
    font-weight: 600;
    font-size: 13px;
    margin-bottom: 3px;
    line-height: 1.3;
    word-break: break-all;
}

.course-card-location {
    font-size: 11px;
    opacity: 0.85;
}

.course-card-sections {
    font-size: 10px;
    opacity: 0.7;
    position: absolute;
    bottom: 4px;
    right: 6px;
}

/* 课程卡片颜色 — 苹果风格柔和色系 */
.course-card-color-0 { background: #007AFF; }
.course-card-color-1 { background: #5856D6; }
.course-card-color-2 { background: #AF52DE; }
.course-card-color-3 { background: #FF2D55; }
.course-card-color-4 { background: #FF9500; }
.course-card-color-5 { background: #34C759; }
.course-card-color-6 { background: #00C7BE; }
.course-card-color-7 { background: #30B0C7; }
.course-card-color-8 { background: #FF6482; }
.course-card-color-9 { background: #AC8E68; }
.course-card-color-10 { background: #5E5CE6; }
.course-card-color-11 { background: #BF5AF2; }
.course-card-color-12 { background: #64D2FF; color: #1c1c1e; }
.course-card-color-13 { background: #FFD60A; color: #1c1c1e; }
.course-card-color-14 { background: #FF375F; }

/* 课程详情弹窗 */
.course-detail-row {
    display: flex;
    justify-content: space-between;
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
    font-size: 14px;
    color: var(--text-primary);
}

.course-detail-row:last-child {
    border-bottom: none;
}

.course-detail-label {
    color: var(--text-secondary);
    flex-shrink: 0;
    margin-right: 16px;
}

/* ==================== 考试安排 ==================== */
.exams-container {
    padding: 24px;
}

.exam-group {
    margin-bottom: 28px;
}

.exam-group-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--divider);
}

.exam-card {
    background: var(--bg-secondary);
    padding: 16px 16px 16px 20px;
    border-radius: 12px;
    margin-bottom: 12px;
    border-left: 4px solid var(--accent);
    transition: all var(--duration) var(--ease);
}

.exam-card:hover {
    box-shadow: var(--card-shadow-hover);
    transform: translateY(-2px);
}

/* 考试紧急程度颜色 */
.exam-card.exam-urgent { border-left-color: var(--error); }
.exam-card.exam-soon { border-left-color: var(--warning); }
.exam-card.exam-normal { border-left-color: var(--accent); }

.exam-course {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.exam-info {
    display: flex;
    flex-direction: column;
    gap: 6px;
    font-size: var(--text-caption);
    color: var(--text-secondary);
}

.exam-info-item {
    display: flex;
    align-items: center;
}

.exam-info-item strong {
    min-width: 70px;
    color: var(--text-primary);
    font-weight: 500;
}

.exam-countdown {
    font-size: var(--text-small);
    font-weight: 600;
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px solid var(--divider);
}

/* ==================== 成绩查询 ==================== */
.grades-container {
    padding: 24px;
}

.grades-table {
    width: 100%;
    border-collapse: collapse;
}

.grades-table th,
.grades-table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--divider);
    font-size: 15px;
}

.grades-table th {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-weight: 500;
    font-size: var(--text-caption);
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.grades-table tr:hover {
    background: var(--bg-secondary);
}

.score-high { color: var(--success); font-weight: 600; }
.score-medium { color: var(--warning); font-weight: 600; }
.score-low { color: var(--error); font-weight: 600; }

/* 绩点信息卡片 */
.gpa-info-card {
    margin-top: 24px;
    background: var(--card-bg);
    border-radius: 14px;
    padding: 24px;
    border: 1px solid var(--border);
}

.gpa-title {
    color: var(--text-primary);
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 16px;
    text-align: center;
}

.gpa-items {
    display: flex;
    justify-content: space-around;
    gap: 16px;
    flex-wrap: wrap;
}

.gpa-item {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 16px 24px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    min-width: 130px;
    flex: 1;
}

.gpa-label {
    color: var(--text-secondary);
    font-size: var(--text-caption);
}

.gpa-value {
    color: var(--accent);
    font-size: 28px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

/* ==================== 教务评价 ==================== */
.evaluation-container {
    padding: 24px;
}

.evaluation-result {
    margin-top: 16px;
    border-radius: 12px;
}

.result-success {
    background: rgba(52,199,89,0.08);
    color: var(--success);
    padding: 16px;
    border-radius: 12px;
}

.result-error {
    background: rgba(255,59,48,0.08);
    color: var(--error);
    padding: 16px;
    border-radius: 12px;
}

.eval-btn {
    padding: 12px 32px;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 12px;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s var(--ease);
}

.eval-btn:hover {
    background: var(--accent-hover);
}

.eval-btn:active {
    transform: scale(0.98);
}

/* ==================== 弹窗 ==================== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.4);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 2000;
    justify-content: center;
    align-items: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--card-bg);
    padding: 28px;
    border-radius: 20px;
    max-width: 420px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    box-shadow: 0 20px 60px rgba(0,0,0,0.15);
    animation: modalIn var(--duration) var(--ease);
}

@keyframes modalIn {
    from { opacity: 0; transform: scale(0.95) translateY(10px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-content h2 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.modal-desc {
    color: var(--text-secondary);
    font-size: var(--text-caption);
    margin-bottom: 20px;
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    background: var(--bg-secondary);
    border: none;
    font-size: 20px;
    color: var(--text-secondary);
    cursor: pointer;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--duration) var(--ease);
    line-height: 1;
}

.modal-close:hover {
    background: var(--divider);
    color: var(--text-primary);
}

/* ==================== 表单 ==================== */
.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    color: var(--text-primary);
    font-weight: 500;
    font-size: 15px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 11px 14px;
    border: 1px solid var(--border);
    border-radius: 10px;
    font-size: 15px;
    font-family: var(--font);
    color: var(--text-primary);
    background: var(--card-bg);
    transition: border-color var(--duration) var(--ease);
    outline: none;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: #C7C7CC;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--accent);
}

.form-group textarea {
    min-height: 100px;
    resize: vertical;
    line-height: 1.6;
}

.form-select {
    width: 100%;
    padding: 11px 14px;
    border: 1px solid var(--border);
    border-radius: 10px;
    font-size: 15px;
    font-family: var(--font);
    color: var(--text-primary);
    background: var(--card-bg);
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236E6E73' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    padding-right: 36px;
    outline: none;
    transition: border-color var(--duration) var(--ease);
}

.form-select:focus {
    border-color: var(--accent);
}

.error-message {
    color: var(--error);
    font-size: var(--text-caption);
    margin-top: 10px;
    text-align: center;
}

.button-group {
    display: flex;
    gap: 12px;
    margin-top: 20px;
    justify-content: flex-end;
}

/* ==================== 论文生成 ==================== */
.paper-container {
    padding: 24px;
}

.paper-warning {
    display: flex;
    align-items: center;
    gap: 10px;
    background: rgba(255,149,0,0.08);
    padding: 12px 16px;
    border-radius: 12px;
    margin-bottom: 20px;
    border-left: 3px solid var(--warning);
}

.warning-icon-svg {
    width: 22px;
    height: 22px;
    flex-shrink: 0;
}

.warning-text {
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 400;
    line-height: 1.5;
}

.paper-mode-tabs {
    display: flex;
    gap: 0;
    margin-bottom: 20px;
    border-radius: 10px;
    overflow: hidden;
    background: var(--bg-secondary);
    padding: 3px;
}

.paper-mode-tab {
    flex: 1;
    padding: 10px 20px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: var(--text-caption);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--duration) var(--ease);
    border-radius: 8px;
}

.paper-mode-tab.active {
    background: var(--card-bg);
    color: var(--text-primary);
    box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}

.paper-mode-tab:hover:not(.active) {
    color: var(--text-primary);
}

.mode-description {
    padding: 14px 16px;
    border-radius: 12px;
    margin-bottom: 20px;
}

.mode-description.simple-desc {
    background: rgba(0,122,255,0.06);
    border-left: 3px solid var(--accent);
}

.mode-description.complex-desc {
    background: rgba(175,82,222,0.06);
    border-left: 3px solid #AF52DE;
}

.desc-title {
    font-weight: 600;
    font-size: 15px;
    margin-bottom: 4px;
    color: var(--text-primary);
}

.desc-content {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.5;
}

.paper-actions {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-top: 20px;
}

.paper-result {
    margin-top: 20px;
}

/* 示例论文下载 */
.sample-paper-box {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-secondary);
    padding: 12px 16px;
    border-radius: 12px;
    margin-bottom: 20px;
    font-size: var(--text-caption);
    color: var(--text-secondary);
}

.sample-paper-link {
    color: var(--accent);
    font-weight: 500;
    text-decoration: none;
    transition: opacity var(--duration) var(--ease);
}

.sample-paper-link:hover {
    opacity: 0.7;
}

/* 进度条 */
.progress-container {
    padding: 20px;
    text-align: center;
}

.progress-bar {
    width: 100%;
    height: 6px;
    background: var(--divider);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 16px;
}

.progress-fill {
    height: 100%;
    background: var(--accent);
    border-radius: 3px;
    transition: width 0.4s var(--ease);
}

.progress-text {
    font-size: var(--text-caption);
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.progress-percent {
    font-size: 24px;
    font-weight: 700;
    color: var(--accent);
    letter-spacing: -0.5px;
}

/* 草稿列表 */
.paper-drafts-list {
    margin-top: 20px;
    padding: 16px;
    background: var(--bg-secondary);
    border-radius: 12px;
}

.paper-drafts-list h4 {
    margin: 0 0 12px 0;
    color: var(--text-primary);
    font-size: 15px;
    font-weight: 600;
}

.draft-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 14px;
    background: var(--card-bg);
    border-radius: 10px;
    margin-bottom: 8px;
    transition: all var(--duration) var(--ease);
}

.draft-item:hover {
    box-shadow: var(--card-shadow);
}

.draft-item:last-child {
    margin-bottom: 0;
}

.draft-info { flex: 1; }

.draft-title {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 3px;
    font-size: 15px;
}

.draft-meta {
    font-size: var(--text-small);
    color: var(--text-tertiary);
}

.draft-actions {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.draft-btn {
    padding: 5px 12px;
    border: none;
    border-radius: 8px;
    font-size: var(--text-small);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s var(--ease);
}

.draft-btn:active { transform: scale(0.96); }

.draft-btn-load {
    background: var(--accent);
    color: #fff;
}

.draft-btn-delete {
    background: rgba(255,59,48,0.1);
    color: var(--error);
}

.draft-btn-delete:hover {
    background: var(--error);
    color: #fff;
}

.draft-btn-feedback {
    background: rgba(255,149,0,0.1);
    color: var(--warning);
}

.draft-btn-feedback:hover {
    background: var(--warning);
    color: #fff;
}

.draft-btn-confirm {
    background: rgba(52,199,89,0.1);
    color: var(--success);
}

.draft-btn-confirm:hover {
    background: var(--success);
    color: #fff;
}

.no-drafts {
    text-align: center;
    color: var(--text-tertiary);
    padding: 20px;
    font-size: var(--text-caption);
}

/* 文件上传 */
.file-upload-box {
    border: 2px dashed var(--border);
    border-radius: 12px;
    padding: 20px;
    text-align: center;
    background: var(--bg-secondary);
    transition: all var(--duration) var(--ease);
}

.file-upload-box:hover {
    border-color: var(--accent);
}

.file-upload-box input[type="file"] {
    width: 100%;
    padding: 8px;
    cursor: pointer;
    font-size: var(--text-caption);
}

.file-upload-hint {
    margin-top: 8px;
    font-size: var(--text-small);
    color: var(--text-tertiary);
}

.uploaded-file-info {
    margin-top: 10px;
    padding: 10px 14px;
    background: rgba(52,199,89,0.08);
    border-radius: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.uploaded-file-name {
    color: var(--success);
    font-weight: 500;
    font-size: var(--text-caption);
}

.uploaded-file-remove {
    background: rgba(255,59,48,0.1);
    color: var(--error);
    border: none;
    padding: 4px 10px;
    border-radius: 6px;
    cursor: pointer;
    font-size: var(--text-small);
    transition: all 0.2s var(--ease);
}

.uploaded-file-remove:hover {
    background: var(--error);
    color: #fff;
}

/* 反馈弹窗 */
.feedback-info {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 14px;
    background: var(--bg-secondary);
    border-radius: 10px;
    margin-bottom: 16px;
    font-size: var(--text-caption);
}

.feedback-title-text {
    font-weight: 600;
    color: var(--text-primary);
}

.feedback-hint {
    font-size: var(--text-small);
    color: var(--warning);
    margin: 12px 0;
    padding: 10px 14px;
    background: rgba(255,149,0,0.06);
    border-radius: 10px;
    border-left: 3px solid var(--warning);
    line-height: 1.5;
}

/* 签收弹窗警告 */
.receipt-warning {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 14px 16px;
    background: rgba(255,59,48,0.06);
    border-radius: 12px;
    margin: 16px 0;
    border-left: 3px solid var(--error);
}

.receipt-warning .warning-content p {
    margin: 0;
    color: var(--error);
    font-size: var(--text-caption);
    line-height: 1.6;
}

.receipt-warning .warning-content p:first-child {
    margin-bottom: 4px;
}

/* ==================== 公告 ==================== */
.announcements-container {
    padding: 24px;
}

.announcements-list-content {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.announcement-item {
    background: var(--bg-secondary);
    padding: 20px;
    border-radius: 12px;
    border-left: 3px solid var(--accent);
    transition: all var(--duration) var(--ease);
}

.announcement-item:hover {
    box-shadow: var(--card-shadow);
    transform: translateY(-2px);
}

.announcement-item.unread {
    background: rgba(0,122,255,0.04);
    border-left-color: var(--success);
}

.announcement-item-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.announcement-item-header h3 {
    color: var(--text-primary);
    font-size: 16px;
    font-weight: 600;
    margin: 0;
    flex: 1;
}

.read-badge,
.unread-badge {
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 500;
}

.read-badge {
    background: var(--bg-secondary);
    color: var(--text-tertiary);
}

.unread-badge {
    background: rgba(52,199,89,0.12);
    color: var(--success);
}

.announcement-item-content {
    color: var(--text-secondary);
    font-size: var(--text-caption);
    line-height: 1.8;
    margin-bottom: 12px;
}

.announcement-item-footer {
    display: flex;
    justify-content: flex-end;
}

.announcement-item-time {
    color: var(--text-tertiary);
    font-size: var(--text-small);
}

/* 公告弹窗 */
.announcement-popup .modal-content {
    max-width: 560px;
}

.announcement-popup-content {
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.8;
    margin-bottom: 20px;
    padding: 16px;
    background: var(--bg-secondary);
    border-radius: 12px;
    max-height: 400px;
    overflow-y: auto;
}

.announcement-popup-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 16px;
    border-top: 1px solid var(--divider);
}

.never-show-label {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    font-size: var(--text-caption);
    cursor: pointer;
    user-select: none;
}

.never-show-label input[type="checkbox"] {
    cursor: pointer;
    accent-color: var(--accent);
}

/* ==================== 反馈建议 ==================== */
.feedback-container {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.feedback-form {
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding: 16px;
    background: var(--bg-secondary);
    border-radius: 12px;
}

.feedback-textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--divider);
    border-radius: 10px;
    background: var(--card-bg);
    color: var(--text-primary);
    font-size: 14px;
    line-height: 1.6;
    resize: vertical;
    font-family: inherit;
    box-sizing: border-box;
}

.feedback-textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(0,122,255,0.1);
}

.feedback-form-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}

.feedback-visibility-select {
    display: flex;
    gap: 16px;
}

.visibility-option {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--text-secondary);
    cursor: pointer;
    user-select: none;
}

.visibility-option input[type="radio"] {
    cursor: pointer;
    accent-color: var(--accent);
}

.feedback-list-content {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.feedback-section-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-secondary);
    padding: 8px 0 4px;
    border-bottom: 1px solid var(--divider);
    margin-top: 8px;
}

.feedback-card {
    background: var(--bg-secondary);
    padding: 0;
    border-radius: 12px;
    border-left: 3px solid var(--accent);
    overflow: hidden;
}

.feedback-floor {
    padding: 14px 16px;
    border-bottom: 1px solid var(--divider);
}

.feedback-floor:last-of-type {
    border-bottom: none;
}

.feedback-floor-admin {
    background: rgba(52,199,89,0.04);
}

.feedback-floor-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 6px;
}

.feedback-floor-num {
    font-size: 12px;
    font-weight: 700;
    color: var(--accent);
    background: rgba(0,122,255,0.08);
    padding: 2px 8px;
    border-radius: 10px;
}

.feedback-username {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
}

.feedback-username.admin-tag {
    color: var(--success);
}

.feedback-floor-content {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.7;
    padding: 4px 0;
}

.feedback-floor-time {
    font-size: 11px;
    color: var(--text-tertiary);
    text-align: right;
}

.feedback-reply-bar {
    padding: 8px 16px;
    border-top: 1px solid var(--divider);
}

.feedback-reply-btn {
    background: none;
    border: none;
    color: var(--accent);
    font-size: 13px;
    cursor: pointer;
    padding: 4px 0;
    font-weight: 500;
}

.feedback-reply-btn:hover {
    text-decoration: underline;
}

.feedback-reply-box {
    padding: 0 16px 14px;
    display: flex;
    gap: 8px;
    align-items: flex-end;
}

.feedback-reply-textarea {
    flex: 1;
    padding: 8px 12px;
    border: 1px solid var(--divider);
    border-radius: 8px;
    background: var(--card-bg);
    color: var(--text-primary);
    font-size: 13px;
    line-height: 1.5;
    resize: none;
    font-family: inherit;
    box-sizing: border-box;
}

.feedback-reply-textarea:focus {
    outline: none;
    border-color: var(--accent);
}

/* ==================== 空状态 ==================== */
.empty-state {
    text-align: center;
    padding: 48px 20px;
    color: var(--text-tertiary);
}

.empty-state-icon {
    font-size: 48px;
    margin-bottom: 12px;
    opacity: 0.4;
}

.empty-state-text {
    font-size: 15px;
    color: var(--text-secondary);
}

/* ==================== 遮罩层 ==================== */
.overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.3);
    z-index: 999;
    transition: opacity var(--duration) var(--ease);
}

.overlay.active {
    display: block;
}

/* ==================== 加载动画 ==================== */
.loading {
    text-align: center;
    padding: 40px;
    color: var(--text-tertiary);
    font-size: 15px;
}

.loading::after {
    content: '';
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid var(--divider);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-left: 8px;
    vertical-align: middle;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ==================== 响应式 ==================== */
@media (max-width: 768px) {
    :root {
        --header-height: 44px;
    }

    .content-wrapper {
        padding: 12px;
    }

    .card {
        padding: 16px;
        border-radius: 14px;
    }

    .card h2 {
        font-size: 18px;
    }

    /* 课程表移动端 */
    .schedule-container { padding: 12px; }

    .schedule-header {
        grid-template-columns: 50px repeat(7, 1fr);
        gap: 3px;
    }

    .schedule-header.no-weekend {
        grid-template-columns: 50px repeat(5, 1fr);
    }

    .schedule-header-day {
        font-size: 11px;
        padding: 4px 2px;
    }

    .schedule-day-date {
        font-size: 9px;
    }

    .schedule-grid {
        grid-template-columns: 50px 1fr;
        gap: 4px;
    }

    .timeline-item {
        height: 56px;
        padding: 2px;
    }

    .schedule-timeline { gap: 3px; }

    .timeline-section { font-size: 14px; }
    .timeline-time-start,
    .timeline-time-end { font-size: 9px; }

    .schedule-days { gap: 3px; }

    .schedule-day-column {
        min-height: 480px;
    }

    .schedule-grid.has-evening .schedule-day-column {
        min-height: 587px;
    }

    .course-card {
        font-size: 10px;
        padding: 4px 3px;
    }

    .course-card-name {
        font-size: 10px;
        line-height: 1.2;
    }

    .course-card-location { font-size: 9px; }

    /* 事件卡片移动端 */
    .event-title { font-size: 20px; }
    .countdown { font-size: 32px; }

    /* 公告移动端 */
    .announcement-popup-content {
        max-height: 280px;
    }

    .announcement-popup-footer {
        flex-direction: column;
        gap: 12px;
        align-items: stretch;
    }

    .announcement-item-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    /* 按钮移动端 */
    .action-bar {
        flex-direction: column;
        align-items: stretch;
    }

    .action-bar .btn-primary,
    .action-bar .btn-secondary {
        width: 100%;
    }

    .draft-actions {
        flex-direction: column;
        gap: 4px;
    }

    .draft-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    .draft-actions {
        width: 100%;
        flex-direction: row;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .content-wrapper {
        padding: 20px;
    }
}

@media (min-width: 1025px) {
    .content-wrapper {
        padding: 24px 40px;
    }
}

/* ==================== 会员页面 ==================== */
.member-status-active {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 4px 0;
}

.member-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
}

.member-badge-basic {
    background: linear-gradient(135deg, #a8edea, #6ec6c6);
    color: #1a5a5a;
}

.member-badge-advanced {
    background: linear-gradient(135deg, #f9d423, #f37335);
    color: #5a2e00;
}

.member-expire {
    font-size: 13px;
    color: var(--text-secondary);
}

.member-status-none,
.member-status-expired {
    font-size: 14px;
    color: var(--text-secondary);
    padding: 4px 0;
}

.member-plans {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 16px;
}

.member-plan-card {
    background: var(--card-bg, #fff);
    border-radius: var(--card-radius);
    box-shadow: var(--card-shadow);
    padding: 20px 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    border: 1.5px solid var(--divider);
    position: relative;
}

.member-plan-advanced {
    border-color: #f37335;
}

.plan-badge {
    font-size: 14px;
    font-weight: 700;
    color: var(--text-primary);
}

.plan-badge-advanced {
    color: #f37335;
}

.plan-price {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
}

.price-num {
    font-size: 32px;
}

.price-unit {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 400;
}

.plan-features {
    list-style: none;
    padding: 0;
    margin: 0;
    flex: 1;
}

.plan-features li {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.plan-features li svg {
    width: 14px;
    height: 14px;
    stroke: var(--success);
    flex-shrink: 0;
}

.plan-feature-extra {
    color: var(--text-tertiary);
    font-size: 11px;
}

.btn-plan {
    width: 100%;
    padding: 10px;
    border: none;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.2s;
}

.btn-plan:active { opacity: 0.7; }

.btn-basic {
    background: linear-gradient(135deg, #a8edea, #6ec6c6);
    color: #1a5a5a;
}

.btn-advanced {
    background: linear-gradient(135deg, #f9d423, #f37335);
    color: #5a2e00;
}

/* 支付类型选择 */
.pay-type-group {
    display: flex;
    gap: 16px;
    margin: 16px 0;
}

.pay-type-option {
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    font-size: 14px;
    color: var(--text-secondary);
}

/* 订单列表 */
.orders-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.order-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 12px;
    background: var(--bg-secondary);
    border-radius: 10px;
}

.order-info {
    display: flex;
    align-items: center;
    gap: 10px;
}

.order-type {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
}

.order-amount {
    font-size: 13px;
    color: var(--text-secondary);
}

.order-status {
    font-size: 11px;
    padding: 2px 8px;
    border-radius: 10px;
}

.order-status-paid {
    background: #d4f5e2;
    color: #1a7a3a;
}

.order-status-pending {
    background: #fff3cd;
    color: #856404;
}

.order-status-failed {
    background: #ffe0de;
    color: var(--error);
}

.order-time {
    font-size: 11px;
    color: var(--text-tertiary);
}

@media (max-width: 480px) {
    .member-plans {
        grid-template-columns: 1fr;
    }
}