/* ============================================================
   默认主题 — 暗色模式
   深蓝灰底 + 紫蓝强调色，增强毛玻璃效果
   兼容 Chrome 70+，不使用 :where() / :is()
   ============================================================ */

#return-btn {
    position: absolute;
    top: 20px;
    left: 20px;
    padding: 12px 24px;
    font-size: 1rem;
    cursor: pointer;
    background: rgba(64, 64, 64, 0.7);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
    color: #E6E1E5;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 20px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    transition: all 0.25s ease;
    z-index: 1001;
}

#return-btn:hover {
    background: rgba(74, 74, 74, 0.85);
    -webkit-transform: translateY(-1px);
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
    border-color: rgba(255, 255, 255, 0.15);
}

body {
    font-family: 'Roboto', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, sans-serif;
    margin: 0;
    padding: 0;
    min-height: 100vh;
    background: linear-gradient(135deg, #0f1923 0%, #1a1a2e 50%, #16213e 100%);
    color: #E6E1E5;
    overflow: auto;
}

body::-webkit-scrollbar {
    display: none;
}

#fullscreen-btn, #settings-btn {
    position: absolute;
    top: 20px;
    padding: 12px 24px;
    font-size: 1rem;
    cursor: pointer;
    background: rgba(64, 64, 64, 0.7);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
    color: #E6E1E5;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 20px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    transition: all 0.25s ease;
    z-index: 1001;
    display: -webkit-flex;
    display: flex;
    -webkit-align-items: center;
    align-items: center;
}

#fullscreen-btn::before {
    content: "fullscreen";
    font-family: 'Material Icons';
    font-size: 20px;
    margin-right: 4px;
}

#settings-btn::before {
    content: "settings";
    font-family: 'Material Icons';
    font-size: 20px;
    margin-right: 4px;
}

#fullscreen-btn { right: 20px; }
#settings-btn { right: 140px; }

#settings-btn:hover, #fullscreen-btn:hover {
    background: rgba(74, 74, 74, 0.85);
    -webkit-transform: translateY(-1px);
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
    border-color: rgba(255, 255, 255, 0.15);
}

.container {
    padding: 24px;
    max-width: min(95vw, 1600px);
    margin: 24px auto;
    background: rgba(18, 18, 18, 0.75);
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 24px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    display: -webkit-flex;
    display: flex;
    -webkit-flex-direction: column;
    flex-direction: column;
    min-height: calc(100vh - 48px);
}

h1 {
    font-size: clamp(2.4rem, 5vw, 3.5rem);
    font-weight: 400;
    text-align: left;
    margin-bottom: 16px;
    color: #E6E1E5;
    display: -webkit-flex;
    display: flex;
    -webkit-align-items: center;
    align-items: center;
    -webkit-justify-content: space-between;
    justify-content: space-between;
}

#room {
    font-size: clamp(2.4rem, 5vw, 3.5rem);
    font-weight: 400;
    color: #8a9bb5;
    margin-left: 20px;
}

#message {
    font-size: clamp(1.4rem, 2.2vw, 1.8rem);
    color: #8a9bb5;
    margin-bottom: 24px;
    opacity: 0.85;
}

.content {
    display: -webkit-flex;
    display: flex;
    -webkit-justify-content: space-between;
    justify-content: space-between;
    -webkit-align-items: stretch;
    align-items: stretch;
    gap: 24px;
    -webkit-flex-wrap: wrap;
    flex-wrap: wrap;
    -webkit-flex: 1 1 auto;
    flex: 1 1 auto;
}

.left-column, .right-column {
    display: -webkit-flex;
    display: flex;
    -webkit-flex-direction: column;
    flex-direction: column;
    gap: 24px;
    -webkit-flex: 1 1 520px;
    flex: 1 1 520px;
    min-width: 320px;
}

.left-column { -webkit-flex: 1 1 520px; flex: 1 1 520px; }
.right-column { -webkit-flex: 1.2 1 640px; flex: 1.2 1 640px; }

.clock-section, .info-section, .right-column {
    background: rgba(33, 33, 33, 0.6);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.06);
    padding: 24px;
    border-radius: 20px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

#current-time {
    font-size: clamp(4rem, 10vw, 8rem);
    text-align: center;
    color: #FFFFFF;
    margin: 0;
    font-weight: 300;
    letter-spacing: 4px;
    text-shadow: 0 0 40px rgba(138, 155, 181, 0.15);
}

#current-subject, #exam-timing, #remaining-time, #status, #paper-info {
    font-size: clamp(1.6rem, 3vw, 3rem);
    margin: 16px 0;
    text-align: left;
    color: #FFFFFF;
}

table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin-top: 24px;
    background: rgba(33, 33, 33, 0.6);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 16px;
    overflow: hidden;
}

th, td {
    padding: 3px;
    font-size: clamp(1.2rem, 1.6vw, 1.8rem);
    text-align: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

th {
    background: rgba(138, 155, 181, 0.1);
    color: #8a9bb5;
    font-weight: 500;
}

tr:hover { background: inherit; }

.exam-status-tag {
    padding: 2px 8px;
    border-radius: 6px;
    font-size: clamp(1rem, 1.3vw, 1.2rem);
    font-weight: 500;
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
}

.exam-status-进行中 { background: rgba(93, 168, 56, 0.2); color: #5ba838; }
.exam-status-即将开始 { background: rgba(255, 185, 96, 0.2); color: #FFB960; }
.exam-status-已结束 { background: rgba(255, 75, 75, 0.2); color: #ff4b4b; }
.exam-status-未开始 { background: rgba(234, 238, 91, 0.2); color: #eaee5b; }

#settings-modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
}

#settings-modal-content {
    background: rgba(64, 64, 64, 0.85);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.08);
    padding: 32px 48px 32px 32px;
    margin: 32px auto;
    border-radius: 28px;
    width: 600px;
    max-height: 60vh;
    overflow-y: auto;
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.4);
}

#settings-modal-content::-webkit-scrollbar { width: 16px; }
#settings-modal-content::-webkit-scrollbar-track { background: transparent; margin: 4px; }
#settings-modal-content::-webkit-scrollbar-thumb {
    background: rgba(74, 68, 88, 0.8);
    border-radius: 8px;
    border: 3px solid rgba(43, 41, 48, 0.8);
    min-height: 40px;
}
#settings-modal-content::-webkit-scrollbar-thumb:hover { background: rgba(99, 91, 112, 0.9); }

#settings-modal-content h3 {
    margin: 0 0 24px;
    color: #E6E1E5;
    font-size: 24px;
    font-weight: 400;
}

#settings-modal-content label {
    display: -webkit-flex;
    display: flex;
    -webkit-align-items: center;
    align-items: center;
    gap: 16px;
    margin: 16px 0;
    font-size: 16px;
    color: #E6E1E5;
}

#settings-modal-content input[type="number"],
#settings-modal-content input[type="text"] {
    font-size: 1.8rem;
    padding: 12px 16px;
    margin: 8px 0 24px;
    width: 100%;
    box-sizing: border-box;
    border: 1px solid rgba(74, 68, 88, 0.6);
    border-radius: 12px;
    background: rgba(51, 45, 65, 0.6);
    color: #E6E1E5;
    transition: all 0.25s ease;
}

#settings-modal-content input:focus {
    outline: none;
    border-color: #8a9bb5;
    background: rgba(74, 68, 88, 0.8);
    box-shadow: 0 0 0 3px rgba(138, 155, 181, 0.15);
}

.button-group {
    display: -webkit-flex;
    display: flex;
    -webkit-justify-content: flex-end;
    justify-content: flex-end;
    gap: 16px;
    margin-top: 32px;
    padding: 16px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}

#save-settings-btn, #close-settings-btn {
    padding: 12px 24px;
    border-radius: 20px;
    font-size: 16px;
    font-weight: 500;
    border: none;
    cursor: pointer;
    transition: all 0.25s ease;
    display: -webkit-flex;
    display: flex;
    -webkit-align-items: center;
    align-items: center;
    gap: 8px;
}

#save-settings-btn { background: rgba(138, 155, 181, 0.8); color: #1C1B1F; }
#save-settings-btn::before { content: "✓"; font-size: 18px; }
#close-settings-btn { background: rgba(74, 68, 88, 0.6); color: #E6E1E5; }
#close-settings-btn::before { content: "✕"; font-size: 18px; }

#save-settings-btn:hover, #close-settings-btn:hover {
    -webkit-transform: translateY(-1px);
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}

#save-settings-btn:hover { background: rgba(138, 155, 181, 0.95); }
#close-settings-btn:hover { background: rgba(99, 91, 112, 0.8); }

.error-container {
    position: fixed;
    bottom: 24px;
    left: 50%;
    -webkit-transform: translateX(-50%);
    transform: translateX(-50%);
    background: rgba(92, 17, 48, 0.9);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 179, 179, 0.15);
    color: #FFB3B3;
    padding: 16px 24px;
    border-radius: 16px;
    display: none;
    z-index: 10001;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
    -webkit-animation: slideUp 0.3s ease;
    animation: slideUp 0.3s ease;
}

.switch {
    position: relative;
    display: inline-block;
    width: 52px;
    height: 32px;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(74, 68, 88, 0.6);
    transition: all 0.3s ease;
    border-radius: 16px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 24px;
    width: 24px;
    left: 4px;
    bottom: 4px;
    background-color: #E6E1E5;
    transition: all 0.3s ease;
    border-radius: 50%;
}

input:checked + .slider { background: rgba(138, 155, 181, 0.7); }
input:checked + .slider:before {
    -webkit-transform: translateX(20px);
    transform: translateX(20px);
    background-color: #1C1B1F;
}

.config-file-container {
    margin: 24px 0;
    padding: 24px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 20px;
    background: rgba(74, 74, 74, 0.4);
    transition: all 0.25s ease;
}

.config-file-container:hover {
    border-color: rgba(138, 155, 181, 0.4);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

.config-file-container input[type="file"] {
    max-width: 100%;
    width: auto;
    box-sizing: border-box;
    padding: 12px;
    border: 1.5px dashed rgba(74, 68, 88, 0.6);
    border-radius: 16px;
    background: rgba(51, 45, 65, 0.4);
    color: #E6E1E5;
    cursor: pointer;
    transition: all 0.25s ease;
}

.config-file-container input[type="file"]::-webkit-file-upload-button {
    padding: 10px 20px;
    margin-right: 12px;
    background: rgba(138, 155, 181, 0.2);
    color: #8a9bb5;
    border: 1px solid rgba(138, 155, 181, 0.3);
    border-radius: 12px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.25s ease;
}

.config-file-container input[type="file"]::-webkit-file-upload-button:hover {
    background: rgba(138, 155, 181, 0.35);
    -webkit-transform: translateY(-1px);
    transform: translateY(-1px);
}

.file-hint {
    margin-top: 12px;
    font-size: 14px;
    color: #CAC4D0;
    line-height: 1.6;
    opacity: 0.8;
}

.config-control-btn {
    margin-top: 20px;
    padding: 12px 28px;
    background: rgba(138, 155, 181, 0.2);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
    color: #8a9bb5;
    border: 1px solid rgba(138, 155, 181, 0.25);
    border-radius: 24px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.25s ease;
    display: -webkit-inline-flex;
    display: inline-flex;
    -webkit-align-items: center;
    align-items: center;
    -webkit-justify-content: center;
    justify-content: center;
}

.config-control-btn:hover {
    background: rgba(138, 155, 181, 0.35);
    -webkit-transform: translateY(-1px);
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(138, 155, 181, 0.2);
}

.theme-toggle-container {
    margin: 24px 0;
    display: -webkit-flex;
    display: flex;
    -webkit-flex-direction: column;
    flex-direction: column;
    gap: 16px;
}

.theme-toggle-container label {
    font-size: 16px;
    color: #E6E1E5;
    margin-bottom: 8px;
}

#theme-select {
    width: 100%;
    padding: 12px 16px;
    font-size: 1.2rem;
    background: rgba(51, 45, 65, 0.6);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
    color: #E6E1E5;
    border: 1px solid rgba(74, 68, 88, 0.6);
    border-radius: 12px;
    cursor: pointer;
    -webkit-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23E6E1E5' stroke-width='2' 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 16px center;
    background-size: 16px;
    transition: all 0.25s ease;
}

#theme-select:hover {
    background: rgba(74, 68, 88, 0.8);
    border-color: rgba(138, 155, 181, 0.4);
}

#theme-select:focus {
    outline: none;
    border-color: #8a9bb5;
    background: rgba(74, 68, 88, 0.8);
    box-shadow: 0 0 0 3px rgba(138, 155, 181, 0.15);
}

#theme-select option {
    background: rgba(43, 41, 48, 0.95);
    color: #E6E1E5;
    padding: 12px;
}

.reminder-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.92);
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
    display: -webkit-flex;
    display: flex;
    -webkit-align-items: center;
    align-items: center;
    -webkit-justify-content: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.5s ease;
    z-index: 9999;
}

.reminder-overlay.show {
    opacity: 1;
    visibility: visible;
}

.reminder-content {
    text-align: center;
    -webkit-animation: fadeIn 0.5s ease;
    animation: fadeIn 0.5s ease;
}

.reminder-title {
    font-size: 5rem;
    color: #FFFFFF;
    margin-bottom: 2rem;
    text-shadow: 0 0 60px rgba(138, 155, 181, 0.2);
}

.reminder-subtitle {
    font-size: 3rem;
    color: #8a9bb5;
}

@-webkit-keyframes fadeIn {
    from {
        opacity: 0;
        -webkit-transform: translateY(-20px);
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        -webkit-transform: translateY(0);
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
        -webkit-transform: translateY(-20px);
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        -webkit-transform: translateY(0);
        transform: translateY(0);
    }
}

.info-section {
    position: relative;
}

.paper-count-container {
    margin: 20px 0;
}

.paper-input-group {
    display: -webkit-flex;
    display: flex;
    -webkit-align-items: center;
    align-items: center;
    gap: 10px;
    margin: 10px 0;
    font-size: 2.5rem;
    color: #E6E1E5;
}

.count-control {
    display: -webkit-flex;
    display: flex;
    -webkit-align-items: center;
    align-items: center;
    gap: 5px;
}

.count-control input {
    width: 60px;
    padding: 8px 12px;
    font-size: 2rem;
    text-align: center;
    background: rgba(33, 33, 33, 0.8);
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
    color: #E6E1E5;
    border: 1px solid rgba(74, 68, 88, 0.6);
    border-radius: 8px;
    transition: all 0.25s ease;
}

.count-control input:focus {
    outline: none;
    border-color: #8a9bb5;
    box-shadow: 0 0 0 2px rgba(138, 155, 181, 0.15);
}

.count-btn {
    display: -webkit-flex;
    display: flex;
    -webkit-align-items: center;
    align-items: center;
    -webkit-justify-content: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border: none;
    border-radius: 50%;
    background: rgba(138, 155, 181, 0.15);
    color: #8a9bb5;
    cursor: pointer;
    transition: all 0.25s ease;
}

.count-btn:hover {
    background: rgba(138, 155, 181, 0.3);
    -webkit-transform: translateY(-1px);
    transform: translateY(-1px);
}

.count-btn .material-icons {
    font-size: 20px;
}

.count-btn-group {
    display: -webkit-flex;
    display: flex;
    -webkit-flex-direction: column;
    flex-direction: column;
    gap: 2px;
    margin-right: 8px;
}

.count-btn-group .count-btn {
    width: 24px;
    height: 24px;
    padding: 0;
    display: -webkit-flex;
    display: flex;
    -webkit-align-items: center;
    align-items: center;
    -webkit-justify-content: center;
    justify-content: center;
}

.count-btn-group .count-btn .material-icons {
    font-size: 16px;
}

@media (max-width: 1200px) {
    .content {
        -webkit-justify-content: center;
        justify-content: center;
    }
    .left-column,
    .right-column {
        -webkit-flex: 1 1 100%;
        flex: 1 1 100%;
        min-width: 0;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 16px;
    }
    h1 {
        -webkit-flex-direction: column;
        flex-direction: column;
        -webkit-align-items: flex-start;
        align-items: flex-start;
        gap: 8px;
    }
    #fullscreen-btn, #settings-btn {
        padding: 8px 16px;
        font-size: 0.85rem;
    }
    #settings-modal-content {
        width: 90%;
        padding: 24px;
        margin: 16px auto;
    }
}