:root {
    --surface: rgba(255, 255, 255, 0.92);
    --text: #1f2937;
    --muted: #6b7280;
    --line: rgba(148, 163, 184, 0.24);
    --primary: #0f766e;
    --primary-light: #14b8a6;
    --success: #059669;
    --danger: #dc2626;
    --shadow: 0 24px 60px rgba(15, 23, 42, 0.14);
    --radius-xl: 28px;
    --radius-lg: 20px;
    --radius-md: 14px;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at top left, rgba(15, 118, 110, 0.18), transparent 28%),
        radial-gradient(circle at bottom right, rgba(245, 158, 11, 0.16), transparent 20%),
        linear-gradient(180deg, #f8fbff 0%, #eef4f8 100%);
}

button,
input,
select {
    font: inherit;
}

.hidden {
    display: none !important;
}

.auth-page {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 32px 20px;
}

.auth-shell {
    width: min(1180px, 100%);
    display: grid;
    gap: 24px;
}

.login-shell {
    grid-template-columns: 1.2fr 0.9fr;
}

.register-shell {
    grid-template-columns: 1.1fr 0.8fr;
}

.auth-hero,
.auth-panel,
.register-side-card,
.topbar,
.sidebar,
.content-card {
    background: var(--surface);
    border: 1px solid rgba(255, 255, 255, 0.55);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow);
    backdrop-filter: blur(18px);
}

.auth-hero,
.auth-panel,
.register-side-card,
.content-card {
    padding: 32px;
}

.auth-badge,
.topbar-tag,
.pill {
    display: inline-flex;
    align-items: center;
    padding: 8px 14px;
    border-radius: 999px;
    background: rgba(15, 118, 110, 0.12);
    color: #115e59;
    font-size: 13px;
    font-weight: 700;
}

.auth-hero h1,
.register-side-card h1 {
    margin: 18px 0 12px;
    line-height: 1.08;
    font-size: clamp(32px, 4vw, 52px);
}

.auth-subtitle,
.panel-head p,
.register-side-card p,
.notice-card li,
.field span,
.content-header p,
.info-meta,
.empty-state p {
    color: var(--muted);
}

.notice-card {
    margin-top: 24px;
    padding: 24px;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, rgba(15, 118, 110, 0.08), rgba(255, 255, 255, 0.85));
    border: 1px solid rgba(15, 118, 110, 0.14);
}

.notice-card h2,
.panel-head h2,
.content-header h2 {
    margin: 0 0 10px;
}

.notice-card ul {
    margin: 0;
    padding-left: 18px;
    display: grid;
    gap: 10px;
}

.panel-head {
    margin-bottom: 24px;
}

.form-grid {
    display: grid;
    gap: 18px;
}

.single-column {
    grid-template-columns: 1fr;
}

.two-columns {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.field {
    display: grid;
    gap: 10px;
}

.field span {
    font-size: 14px;
    font-weight: 700;
}

.field input,
.field select {
    width: 100%;
    border: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.95);
    border-radius: 16px;
    padding: 10px 16px;
    outline: none;
}

/* 下拉列表通用样式 */
select {
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    background-image: url('data:image/svg+xml;charset=US-ASCII,<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24"><path fill="%236b7280" d="M7 10l5 5 5-5z"/></svg>');
    background-repeat: no-repeat;
    background-position: right 16px center;
    background-size: 16px;
}

/* 学院下拉列表选项样式 */
select[name="college"] option {
    padding: 6px 16px;
    line-height: 1.3;
}

/* 学院下拉列表占位符样式 */
select[name="college"] option[value=""] {
    color: var(--muted);
    display: none;
}

/* 未选择时显示占位符颜色 */
select[name="college"]:invalid {
    color: var(--muted);
}

/* 选择后显示正常颜色 */
select[name="college"]:valid {
    color: var(--text);
}

.form-actions {
    display: flex;
    gap: 14px;
    align-items: center;
}

.form-actions.stacked {
    flex-direction: column;
}

.full-row {
    grid-column: 1 / -1;
}

.primary-btn,
.ghost-btn,
.nav-item,
.tab-item,
.action-btn {
    border: none;
    cursor: pointer;
    transition: transform 0.2s ease, background 0.2s ease;
}

.primary-btn,
.ghost-btn {
    min-height: 48px;
    padding: 0 22px;
    border-radius: 16px;
    font-weight: 700;
}

.primary-btn {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: #fff;
}

.ghost-btn {
    background: rgba(255, 255, 255, 0.8);
    color: var(--text);
    border: 1px solid var(--line);
}

.small {
    min-height: 40px;
    padding: 0 16px;
}

.form-message {
    min-height: 22px;
    margin: 0;
    font-size: 14px;
}

.form-message.success {
    color: var(--success);
}

.form-message.error {
    color: var(--danger);
}

.app-body {
    padding: 24px;
}

.app-layout {
    display: grid;
    gap: 18px;
}

.topbar {
    padding: 22px 28px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.topbar h1 {
    margin: 10px 0 0;
    font-size: 30px;
}

.topbar-user {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
}

.main-layout {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 18px;
}

.sidebar {
    padding: 18px;
    display: grid;
    gap: 10px;
    align-content: start;
}

.nav-item {
    width: 100%;
    text-align: left;
    padding: 16px 18px;
    border-radius: 18px;
    background: transparent;
    color: var(--text);
    font-weight: 700;
}

.nav-item.active,
.tab-item.active {
    background: linear-gradient(135deg, rgba(15, 118, 110, 0.14), rgba(20, 184, 166, 0.24));
    color: #115e59;
}

.content-area {
    display: grid;
    gap: 18px;
}

.content-header,
.section-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.content-tabs {
    display: flex;
    gap: 10px;
}

.tab-item {
    min-width: 110px;
    padding: 12px 18px;
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.72);
    font-weight: 700;
}

.profile-grid,
.summary-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
}

.summary-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    margin-bottom: 22px;
}

.info-card,
.summary-card {
    padding: 18px;
    border-radius: 20px;
    background: rgba(248, 250, 252, 0.96);
    border: 1px solid rgba(226, 232, 240, 0.9);
}

.summary-card strong,
.info-card strong {
    display: block;
    margin-bottom: 8px;
}

.summary-card p,
.info-card p {
    margin: 0;
    font-size: 16px;
}

.section-block+.section-block {
    margin-top: 28px;
}

.section-head {
    margin-bottom: 18px;
}

.event-table {
    width: 100%;
    border-collapse: collapse;
    border-radius: 18px;
    overflow: hidden;
    background: rgba(255, 255, 255, 0.86);
}

.event-table th,
.event-table td {
    padding: 15px 14px;
    text-align: left;
    border-bottom: 1px solid rgba(226, 232, 240, 0.9);
    font-size: 14px;
}

.event-table th:last-child,
.event-table td:last-child {
    text-align: center;
}

.event-table th {
    background: rgba(15, 118, 110, 0.08);
    color: #115e59;
}

.event-table tr:last-child td {
    border-bottom: none;
}

.action-btn {
    padding: 10px 16px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: #fff;
    font-weight: 700;
}

.action-btn[disabled] {
    background: rgba(148, 163, 184, 0.6);
    cursor: not-allowed;
}

.empty-state {
    padding: 32px 20px;
    text-align: center;
    border-radius: 22px;
    background: rgba(248, 250, 252, 0.86);
    border: 1px dashed rgba(148, 163, 184, 0.45);
}

/* 分页样式 */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    margin-top: 20px;
    flex-wrap: wrap;
}

.page-btn {
    min-width: 36px;
    height: 36px;
    padding: 0 12px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.95);
    color: var(--text);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.page-btn:hover:not(:disabled) {
    background: rgba(15, 118, 110, 0.08);
    border-color: var(--primary);
}

.page-btn.active {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: #fff;
    border-color: transparent;
}

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

.page-info {
    text-align: center;
    margin-top: 12px;
    font-size: 14px;
    color: var(--muted);
}

@media (max-width: 960px) {

    .login-shell,
    .register-shell,
    .main-layout,
    .profile-grid,
    .summary-grid,
    .two-columns {
        grid-template-columns: 1fr;
    }

    .topbar,
    .content-header,
    .section-head {
        flex-direction: column;
        align-items: flex-start;
        gap: 14px;
    }
}

@media (max-width: 640px) {

    body,
    .app-body {
        padding: 14px;
    }

    .form-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .event-table {
        display: block;
        overflow-x: auto;
    }
}