.top-bar {
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 12px 24px;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(56, 64, 58, 0.08);
}
body.dark-mode .top-bar {
    background: rgba(26, 26, 26, 0.85);
    border-bottom-color: rgba(255, 255, 255, 0.06);
}
.top-bar .header-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: flex-end;
    max-width: 1200px;
    margin: 0 auto;
}
.spotlight-panel {
    margin-top: 0;
    padding: 24px;
    border-radius: var(--radius-xl);
    background: linear-gradient(180deg, rgba(255, 251, 245, 0.9), rgba(250, 241, 228, 0.78));
    border: 1px solid rgba(56, 64, 58, 0.08);
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(12px);
    position: relative;
    overflow: hidden;
}
.spotlight-panel::before {
    content: "";
    position: absolute;
    top: 0;
    left: 10%;
    right: 10%;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.8), transparent);
}

.tool-search-wrapper {
    display: grid;
    gap: 16px;
}

.search-copy h2 {
    margin-top: 10px;
    font-size: clamp(1.7rem, 3vw, 2.3rem);
}

.tool-search-input-group {
    position: relative;
}

.tool-search-input-group::before {
    content: "";
    position: absolute;
    top: 50%;
    left: 20px;
    width: 18px;
    height: 18px;
    transform: translateY(-50%);
    border-radius: 50%;
    border: 2px solid rgba(47, 93, 80, 0.48);
    box-sizing: border-box;
}

.tool-search-input-group::after {
    content: "";
    position: absolute;
    top: calc(50% + 6px);
    left: 34px;
    width: 9px;
    height: 2px;
    border-radius: 999px;
    background: rgba(47, 93, 80, 0.48);
    transform: rotate(45deg);
}

.tool-search-input {
    width: 100%;
    min-height: 64px;
    padding: 0 122px 0 58px;
    border-radius: 24px;
    border: 1px solid rgba(56, 64, 58, 0.12);
    background: rgba(255, 251, 245, 0.92);
    color: var(--text);
    outline: none;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.8);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

.tool-search-input:focus {
    border-color: rgba(47, 93, 80, 0.45);
    box-shadow: 0 0 0 5px rgba(47, 93, 80, 0.1), 0 0 24px rgba(47, 93, 80, 0.06);
    background: rgba(255, 252, 246, 1);
}

.tool-search-input::placeholder {
    color: var(--text-tertiary);
}

.tool-search-clear {
    position: absolute;
    top: 50%;
    right: 10px;
    transform: translateY(-50%);
    min-height: 42px;
    padding: 0 16px;
    border: none;
    border-radius: var(--radius-full);
    background: var(--color-primary);
    color: #fff8f0;
    cursor: pointer;
    font-weight: 700;
    transition: transform var(--transition-fast), background var(--transition-fast), box-shadow var(--transition-fast);
}

.tool-search-clear:hover {
    transform: translateY(calc(-50% - 1px));
    background: var(--color-primary-hover);
}

.tool-search-meta,
.tool-search-empty {
    color: var(--text-secondary);
    font-size: 0.92rem;
}

.quick-launch {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 16px;
}

.quick-launch-chip {
    min-height: 40px;
    padding: 0 16px;
    border-radius: var(--radius-full);
    border: 1px solid rgba(56, 64, 58, 0.1);
    background: rgba(255, 250, 242, 0.72);
    color: var(--text);
    cursor: pointer;
    font-weight: 600;
    transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

.quick-launch-chip:hover {
    transform: translateY(-1px);
    border-color: rgba(47, 93, 80, 0.24);
    box-shadow: var(--shadow-xs);
    background: rgba(255, 250, 242, 0.94);
}
.quick-launch-chip:active {
    transform: translateY(0) scale(0.97);
    box-shadow: none;
}

.easter-egg-trigger {
    position: fixed;
    right: 8px;
    bottom: 8px;
    width: 52px;
    height: 52px;
    z-index: 9997;
    cursor: pointer;
}

.student-management-container {
    margin-top: 16px;
}

.student-management {
    padding: 28px;
    border-radius: var(--radius-xl);
    background: linear-gradient(180deg, rgba(255, 251, 245, 0.92), rgba(251, 243, 231, 0.82));
    border: 1px solid rgba(56, 64, 58, 0.08);
    box-shadow: var(--shadow-sm);
}

.student-management-header {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    align-items: flex-start;
    margin-bottom: 22px;
}

.student-management-header h2 {
    margin-top: 10px;
    font-size: 2rem;
}

.student-management-note {
    max-width: 320px;
    color: var(--text-secondary);
    font-size: 0.94rem;
}

.student-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.1fr) minmax(300px, 0.9fr);
    gap: 20px;
}

.student-input-section,
.student-side-panel {
    display: grid;
    gap: 16px;
}

.input-group {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) auto;
    gap: 12px;
}

.input-group input,
.batch-import textarea,
.file-import input {
    width: 100%;
    min-height: 48px;
    padding: 12px 16px;
    border-radius: 18px;
    border: 1px solid rgba(56, 64, 58, 0.12);
    background: rgba(255, 252, 246, 0.88);
    color: var(--text);
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

.input-group input:focus,
.batch-import textarea:focus,
.file-import input:focus {
    border-color: rgba(47, 93, 80, 0.45);
    box-shadow: 0 0 0 4px rgba(47, 93, 80, 0.1), 0 0 16px rgba(47, 93, 80, 0.05);
    background: rgba(255, 252, 246, 1);
}

.batch-import,
.file-import {
    padding: 18px;
    border-radius: 24px;
    background: rgba(255, 247, 236, 0.72);
    border: 1px solid rgba(56, 64, 58, 0.08);
}

.batch-import h3,
.file-import h3 {
    margin-bottom: 10px;
    font-size: 1.05rem;
    font-family: "Segoe UI", "PingFang SC", sans-serif;
    letter-spacing: 0;
}

.batch-import textarea {
    min-height: 132px;
    resize: vertical;
    margin-bottom: 12px;
    font-family: "Cascadia Code", "SFMono-Regular", Consolas, monospace;
    font-size: 0.9rem;
}

.btn.add {
    background: var(--color-primary);
    color: #fff8f0;
}

.btn.import {
    background: var(--color-secondary);
    color: #fff8f0;
}

.btn.clear {
    background: #8d4a41;
    color: #fff8f0;
}

.student-list-container {
    min-height: 320px;
    max-height: 420px;
    overflow: auto;
    padding: 16px;
    border-radius: 28px;
    background: rgba(255, 252, 246, 0.8);
    border: 1px solid rgba(56, 64, 58, 0.08);
}

.empty-list {
    display: grid;
    place-items: center;
    min-height: 180px;
    color: var(--text-tertiary);
    text-align: center;
}

.student-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 14px 16px;
    border-radius: 20px;
    background: rgba(255, 247, 236, 0.58);
    border: 1px solid rgba(56, 64, 58, 0.06);
}

.student-item + .student-item {
    margin-top: 10px;
}
.student-item {
    transition: transform var(--transition-fast), background var(--transition-fast), box-shadow var(--transition-fast);
}
.student-item:hover {
    transform: translateX(4px);
    background: rgba(255, 247, 236, 0.82);
    box-shadow: var(--shadow-xs);
}

.student-info {
    flex: 1;
    color: var(--text);
    word-break: break-all;
}

.student-id {
    color: var(--color-primary);
    font-weight: 700;
}

.remove-student {
    min-height: 38px;
    padding: 0 14px;
    border: none;
    border-radius: var(--radius-full);
    background: #a44f4f;
    color: #fff;
    cursor: pointer;
    font-weight: 700;
    transition: transform var(--transition-fast), opacity var(--transition-fast), box-shadow var(--transition-fast);
}

.remove-student:hover {
    transform: translateY(-1px);
    box-shadow: 0 10px 18px rgba(164, 79, 79, 0.18);
}

.student-summary {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
}

.summary-card {
    padding: 20px 18px;
    border-radius: 24px;
    background: rgba(255, 247, 236, 0.72);
    border: 1px solid rgba(56, 64, 58, 0.08);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}
.summary-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-sm);
}

.summary-value {
    font-family: "Georgia", "Times New Roman", serif;
    font-size: 2rem;
    color: var(--color-primary);
}

.summary-label {
    margin-top: 6px;
    color: var(--text-secondary);
}

#fileInfo {
    margin-top: 10px;
    color: var(--text-secondary);
    font-size: 0.88rem;
}

.donation-modal-overlay,
.announcement-modal-overlay {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background: rgba(22, 25, 21, 0.48);
    backdrop-filter: blur(10px);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-fast), visibility var(--transition-fast);
    z-index: 10000;
}

.announcement-modal-overlay {
    z-index: 10001;
}

.donation-modal-overlay.show,
.announcement-modal-overlay.show {
    opacity: 1;
    visibility: visible;
}

.donation-modal,
.announcement-modal {
    width: min(100%, 520px);
    border-radius: 28px;
    background: linear-gradient(180deg, rgba(255, 252, 246, 0.98), rgba(250, 242, 231, 0.94));
    border: 1px solid rgba(56, 64, 58, 0.08);
    box-shadow: var(--shadow-lg);
    transform: translateY(20px) scale(0.98);
    transition: transform var(--transition), opacity var(--transition);
    overflow: hidden;
}

.donation-modal-overlay.show .donation-modal,
.announcement-modal-overlay.show .announcement-modal {
    transform: translateY(0) scale(1);
}

.donation-modal {
    max-width: 430px;
    padding: 26px;
    text-align: center;
    position: relative;
}

.donation-modal-close,
.announcement-modal-close {
    position: absolute;
    top: 14px;
    right: 14px;
    width: 34px;
    height: 34px;
    border: none;
    border-radius: 50%;
    background: rgba(56, 64, 58, 0.08);
    color: var(--text);
    cursor: pointer;
    font-size: 1rem;
    transition: transform var(--transition-fast), background var(--transition-fast);
}
.donation-modal-close:hover,
.announcement-modal-close:hover {
    transform: rotate(90deg);
    background: rgba(56, 64, 58, 0.16);
}

.donation-modal-icon {
    display: inline-grid;
    place-items: center;
    width: 72px;
    height: 72px;
    margin: 10px auto 14px;
    border-radius: 22px;
    background: rgba(201, 107, 69, 0.12);
    color: var(--color-secondary);
    font-family: "Georgia", "Times New Roman", serif;
    font-size: 1.35rem;
    font-weight: 700;
}

.donation-modal h3 {
    font-size: 1.7rem;
}

.donation-modal p {
    margin-top: 12px;
    color: var(--text-secondary);
}

.donation-modal-buttons {
    display: flex;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 20px;
}

.donation-modal-btn,
.announcement-modal-btn {
    min-height: 44px;
    padding: 0 18px;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    font-weight: 700;
}

.donation-modal-btn.primary,
.announcement-modal-btn.primary {
    background: var(--color-primary);
    color: #fff8f0;
}

.announcement-modal-btn.danger {
    background: var(--color-secondary);
    color: #fff8f0;
}

.donation-modal-btn.secondary {
    background: rgba(56, 64, 58, 0.08);
    color: var(--text);
}

.donation-modal-tip {
    margin-top: 14px;
    color: var(--text-tertiary);
    font-size: 0.86rem;
}

.announcement-modal {
    position: relative;
    max-height: min(78vh, 760px);
    display: flex;
    flex-direction: column;
}

.announcement-modal-header {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 24px 24px 18px;
    background: rgba(47, 93, 80, 0.92);
    color: #fff8f0;
}

.announcement-modal-header .icon {
    display: inline-grid;
    place-items: center;
    width: 40px;
    height: 40px;
    border-radius: 14px;
    background: rgba(255, 250, 242, 0.16);
    font-size: 0.95rem;
    font-weight: 700;
}

.announcement-modal-header h3 {
    font-size: 1.4rem;
}

.announcement-modal-content {
    padding: 22px 24px;
    overflow: auto;
    color: var(--text-secondary);
}

.announcement-modal-content h1,
.announcement-modal-content h2,
.announcement-modal-content h3 {
    margin: 16px 0 8px;
    color: var(--text);
}

.announcement-modal-content p,
.announcement-modal-content li {
    line-height: 1.72;
}

.announcement-modal-footer {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: center;
    padding: 0 24px 24px;
}

body.spring-festival-theme .hero-header {
    background: linear-gradient(180deg, rgba(103, 23, 23, 0.28), transparent);
}

body.spring-festival-theme .hero-copy,
body.spring-festival-theme .workspace-intro,
body.spring-festival-theme .tool-category {
    box-shadow: 0 24px 54px rgba(148, 21, 21, 0.12);
}

.spring-festival-decor {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 9998;
    overflow: hidden;
}

.spring-festival-lantern {
    position: absolute;
    top: 12px;
    font-size: 2rem;
    animation: sway 3.4s ease-in-out infinite;
}

.spring-festival-lantern.left {
    left: 14px;
}

.spring-festival-lantern.right {
    right: 14px;
    animation-delay: -1.2s;
}

.spring-festival-couplet {
    position: absolute;
    top: 106px;
    width: 40px;
    height: 210px;
    padding: 12px 0;
    border-radius: 14px;
    background: linear-gradient(180deg, #9e1f1f, #c53030);
    color: #f7d56b;
    border: 1px solid rgba(247, 213, 107, 0.55);
    text-align: center;
    writing-mode: vertical-rl;
    text-orientation: mixed;
    font-weight: 700;
}

.spring-festival-couplet.left {
    left: 12px;
}

.spring-festival-couplet.right {
    right: 12px;
}

.spring-festival-confetti {
    position: absolute;
    top: -16px;
    left: var(--sf-left, 50%);
    width: var(--sf-size, 10px);
    height: calc(var(--sf-size, 10px) * 1.6);
    border-radius: 999px;
    background: var(--sf-color, #f7d56b);
    transform: rotate(var(--sf-rot, 0deg));
    animation: sfFall var(--sf-duration, 6s) linear var(--sf-delay, 0s) infinite;
}

@keyframes sway {
    0%,
    100% {
        transform: translateY(0) rotate(-3deg);
    }
    50% {
        transform: translateY(10px) rotate(3deg);
    }
}

@keyframes sfFall {
    0% {
        transform: translateY(-20px) rotate(var(--sf-rot, 0deg));
    }
    100% {
        transform: translateY(110vh) rotate(calc(var(--sf-rot, 0deg) + 200deg));
    }
}

body.dark-mode .spotlight-panel,
body.dark-mode .student-management,
body.dark-mode .donation-modal,
body.dark-mode .announcement-modal {
    background: linear-gradient(180deg, rgba(31, 37, 33, 0.96), rgba(24, 29, 26, 0.92));
    border-color: rgba(255, 244, 228, 0.06);
}

body.dark-mode .tool-search-input,
body.dark-mode .input-group input,
body.dark-mode .batch-import textarea,
body.dark-mode .file-import input,
body.dark-mode .student-list-container {
    background: rgba(255, 244, 228, 0.03);
    border-color: rgba(255, 244, 228, 0.08);
}

body.dark-mode .quick-launch-chip,
body.dark-mode .student-item,
body.dark-mode .summary-card,
body.dark-mode .batch-import,
body.dark-mode .file-import,
body.dark-mode .donation-modal-btn.secondary,
body.dark-mode .donation-modal-close,
body.dark-mode .announcement-modal-close {
    background: rgba(255, 244, 228, 0.04);
    border-color: rgba(255, 244, 228, 0.08);
}

body.dark-mode .announcement-modal-header {
    background: rgba(19, 23, 19, 0.92);
}

@media (max-width: 980px) {
    .student-layout {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 760px) {
    .spotlight-panel {
        margin-top: -18px;
        padding: 18px;
        border-radius: 24px;
    }

    .tool-search-input {
        min-height: 58px;
        padding-right: 92px;
    }

    .tool-search-clear {
        padding: 0 12px;
    }

    .input-group {
        grid-template-columns: 1fr;
    }

    .student-management-header {
        flex-direction: column;
    }

    .student-management-note {
        max-width: none;
    }

    .student-item {
        flex-direction: column;
        align-items: flex-start;
    }

    .student-summary {
        grid-template-columns: 1fr;
    }

    .donation-modal,
    .announcement-modal {
        border-radius: 24px;
    }
}