:root {
    --sg-primary: #026f67;
    --sg-primary-dark: #015950;
    --sg-primary-deep: #0b403d;
    --sg-primary-soft: #e8f4f2;
    --sg-primary-faint: #f3f9f8;
    --sg-blue: #1c6f8d;
    --sg-text: #17302e;
    --sg-muted: #71807e;
    --sg-line: #dce8e6;
    --sg-bg: #f5f8f7;
    --sg-card: #ffffff;
    --sg-shadow: 0 12px 34px rgba(21, 78, 73, 0.08);
}

body {
    background: var(--sg-bg);
    color: var(--sg-text);
}

.site-header {
    position: relative;
    background:
        linear-gradient(180deg, rgba(2,111,103,.07), rgba(255,255,255,0) 72%),
        #fff;
    border-bottom: 1px solid var(--sg-line);
}

.site-header::before {
    content: "";
    position: absolute;
    inset: 0 0 auto 0;
    height: 5px;
    background: linear-gradient(90deg, var(--sg-primary-dark), var(--sg-primary), #2b8d87);
}

.header-content,
main {
    max-width: 1240px;
}

.header-content {
    padding-top: 28px;
    padding-bottom: 28px;
}

.top-dashboard {
    grid-template-columns: minmax(0, 1.18fr) minmax(380px, .82fr);
    gap: 22px;
}

.brand-panel {
    min-width: 0;
}

.sg-brand-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.sg-brand-identity {
    display: flex;
    align-items: center;
    gap: 16px;
    min-width: 0;
}

.sg-brand-logo {
    width: 216px;
    max-width: 36vw;
    height: auto;
    display: block;
    mix-blend-mode: multiply;
}

.sg-brand-copy {
    min-width: 0;
    padding-left: 16px;
    border-left: 1px solid var(--sg-line);
}

.sg-brand-copy strong {
    display: block;
    color: var(--sg-primary-dark);
    font-size: 21px;
    letter-spacing: .02em;
}

.sg-brand-copy span {
    display: block;
    margin-top: 4px;
    color: var(--sg-muted);
    font-size: 12px;
}

.brand-panel > .small-title,
.brand-panel > h1,
.brand-panel > .subtitle {
    display: none;
}

.sg-search-wrap {
    position: relative;
    margin-top: 20px;
    z-index: 50;
}

.sg-search-box {
    display: flex;
    align-items: center;
    gap: 10px;
    min-height: 48px;
    padding: 0 14px;
    background: #fff;
    border: 1px solid #cddfdd;
    border-radius: 12px;
    box-shadow: 0 5px 18px rgba(18, 72, 68, .06);
    transition: border-color .18s ease, box-shadow .18s ease;
}

.sg-search-box:focus-within {
    border-color: var(--sg-primary);
    box-shadow: 0 0 0 3px rgba(2,111,103,.10), 0 8px 24px rgba(18,72,68,.08);
}

.sg-search-icon {
    width: 20px;
    height: 20px;
    color: var(--sg-primary);
    flex: 0 0 auto;
}

.sg-search-input {
    width: 100%;
    min-width: 0;
    padding: 0;
    border: 0;
    outline: 0;
    background: transparent;
    color: var(--sg-text);
    font: inherit;
    font-size: 14px;
}

.sg-search-input::placeholder {
    color: #95a3a1;
}

.sg-search-hint {
    flex: 0 0 auto;
    padding: 3px 7px;
    border-radius: 7px;
    background: var(--sg-primary-soft);
    color: var(--sg-primary-dark);
    font-size: 11px;
}

.sg-search-results {
    position: absolute;
    top: calc(100% + 7px);
    left: 0;
    right: 0;
    max-height: 390px;
    overflow: auto;
    padding: 7px;
    background: #fff;
    border: 1px solid var(--sg-line);
    border-radius: 13px;
    box-shadow: 0 18px 44px rgba(21, 65, 62, .16);
}

.sg-search-empty {
    padding: 17px 14px;
    color: var(--sg-muted);
    font-size: 13px;
    text-align: center;
}

.sg-search-result {
    display: block;
    width: 100%;
    padding: 10px 12px;
    border-radius: 9px;
    background: transparent;
    color: var(--sg-text);
    text-align: left;
}

.sg-search-result:hover,
.sg-search-result.is-active {
    background: var(--sg-primary-faint);
}

.sg-search-result-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
    margin-bottom: 5px;
    color: var(--sg-primary);
    font-size: 11px;
}

.sg-search-result-title {
    display: -webkit-box;
    overflow: hidden;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
    line-height: 1.5;
    font-size: 13px;
    font-weight: 600;
}

.summary-card {
    grid-template-columns: repeat(3, minmax(0, 1fr)) minmax(132px, .95fr);
    gap: 0;
    padding: 0;
    overflow: hidden;
    margin-top: 18px;
    background: #fff;
    border: 1px solid var(--sg-line);
    border-radius: 14px;
    box-shadow: 0 7px 24px rgba(19, 79, 73, .05);
}

.summary-card > div {
    min-height: 106px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 14px 10px;
    border-right: 1px solid #e7efee;
}

.summary-card > div:last-child {
    border-right: 0;
}

.summary-number {
    color: var(--sg-primary-dark);
    font-size: 28px;
    font-weight: 750;
    line-height: 1.05;
}

.summary-label {
    margin-top: 7px;
    color: var(--sg-muted);
    font-size: 11px;
    letter-spacing: .03em;
}

.sg-accuracy-stat {
    flex-direction: row !important;
    gap: 10px;
}

.sg-accuracy-ring {
    --accuracy: 0;
    position: relative;
    width: 68px;
    height: 68px;
    flex: 0 0 auto;
    display: grid;
    place-items: center;
    border-radius: 50%;
    background: conic-gradient(var(--sg-primary) calc(var(--accuracy) * 1%), #e5efed 0);
}

.sg-accuracy-ring::before {
    content: "";
    position: absolute;
    inset: 7px;
    border-radius: 50%;
    background: white;
}

.sg-accuracy-value {
    position: relative;
    z-index: 1;
    color: var(--sg-primary-dark);
    font-size: 17px;
    font-weight: 800;
}

.sg-accuracy-copy {
    min-width: 0;
    text-align: left;
}

.sg-accuracy-copy strong {
    display: block;
    color: var(--sg-text);
    font-size: 12px;
}

.sg-accuracy-copy span {
    display: block;
    margin-top: 5px;
    color: var(--sg-muted);
    font-size: 10px;
    line-height: 1.4;
}

.calendar-card,
.compact-section details,
.review-section-chooser,
.review-major-panel,
.task-card,
.question-inventory-panel {
    border-color: var(--sg-line) !important;
    box-shadow: var(--sg-shadow);
}

.calendar-card {
    background: linear-gradient(145deg, #f3f9f8, #ffffff 68%);
    border-radius: 16px;
}

.calendar-date,
.review-major-panel-title,
.review-pool-category-title,
.review-section-group-title {
    color: var(--sg-primary-deep) !important;
}

.week-day {
    border: 1px solid #e1ecea;
}

.week-day.today {
    background: var(--sg-primary);
    box-shadow: 0 5px 14px rgba(2,111,103,.20);
}

.week-task-dot {
    background: var(--sg-primary);
}

.compact-section details {
    border-radius: 14px;
}

.compact-summary:hover {
    background: var(--sg-primary-faint);
}

.compact-summary strong {
    color: var(--sg-primary-deep);
}

/* 学习打卡只承担“确认完成”功能：桌面端压成紧凑清单，避免挤占复习区空间。 */
#study-checkin .compact-summary {
    padding: 13px 16px;
}

#study-checkin .compact-summary strong {
    font-size: 15px;
}

#study-checkin .compact-summary small {
    margin-top: 2px;
    font-size: 10px;
}

#study-checkin .compact-body {
    padding: 0 10px 10px;
}

#study-checkin #task-list {
    display: grid;
    gap: 5px;
}

#study-checkin .task-card {
    min-height: 0;
    margin: 0;
    padding: 7px 9px 7px 11px;
    gap: 10px;
    border-radius: 9px;
    box-shadow: none;
}

#study-checkin .task-info {
    display: grid;
    grid-template-columns: minmax(170px, .85fr) minmax(260px, 1.55fr) auto;
    align-items: center;
    column-gap: 14px;
    min-width: 0;
}

#study-checkin .task-module,
#study-checkin .task-week {
    margin: 0;
    color: #7e8b88;
    white-space: nowrap;
}

#study-checkin .task-module {
    font-size: 10px;
}

#study-checkin .status-chip {
    margin-left: 5px;
    padding: 1px 5px;
    font-size: 9px;
}

#study-checkin .task-name {
    min-width: 0;
    overflow: hidden;
    color: var(--sg-text);
    font-size: 13px;
    font-weight: 650;
    line-height: 1.35;
    text-overflow: ellipsis;
    white-space: nowrap;
}

#study-checkin .task-week {
    font-size: 9px;
}

#study-checkin .task-card > button {
    flex: 0 0 auto;
    min-height: 30px;
    padding: 5px 10px;
    border-radius: 7px;
    font-size: 11px;
    line-height: 1.2;
}

#study-checkin .task-card.overdue {
    border-left-width: 3px;
}

.eyebrow {
    color: var(--sg-primary) !important;
}

button,
#review-by-section-btn,
#start-review-btn,
.calculator-launcher {
    background: var(--sg-primary);
}

button:hover:not(:disabled),
#review-by-section-btn:hover,
#start-review-btn:hover {
    background: var(--sg-primary-dark);
}

.secondary-review-button,
.review-row-view,
.review-view-module-button,
.view-all-questions-button,
.wrong-view-button {
    background: #fff !important;
    color: var(--sg-primary-dark) !important;
    border: 1px solid #bcd4d1 !important;
}

.secondary-review-button:hover:not(:disabled),
.review-row-view:hover:not(:disabled),
.review-view-module-button:hover:not(:disabled),
.view-all-questions-button:hover:not(:disabled),
.wrong-view-button:hover:not(:disabled) {
    background: var(--sg-primary-faint) !important;
}

.review-card {
    background: var(--sg-primary-faint);
}

.status-chip,
.question-meta span {
    background: var(--sg-primary-soft) !important;
    color: var(--sg-primary-dark) !important;
}

.task-card.overdue {
    border-left-color: #b07b28;
}

.option-btn {
    background: #fff;
    color: var(--sg-text);
    border: 1px solid #d6e3e1;
}

.option-btn:hover:not(:disabled) {
    background: var(--sg-primary-faint);
    border-color: #a8cbc6;
}

.multi-option-btn.is-selected {
    background: #d9efeb !important;
    color: var(--sg-primary-dark) !important;
    outline-color: #68a9a2 !important;
}

.correct-result {
    border-left: 4px solid var(--sg-primary);
}

.wrong-result {
    border-left: 4px solid #b85c4d;
}

.review-chapter-row:hover,
.wrong-row:hover {
    background: var(--sg-primary-faint) !important;
}

.review-chapter-index,
.wrong-row-count,
.review-major-panel-count {
    color: var(--sg-primary) !important;
}

.calculator-launcher {
    box-shadow: 0 9px 24px rgba(2,111,103,.24);
}

@media (max-width: 900px) {
    .top-dashboard {
        grid-template-columns: 1fr;
    }
    .summary-card {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }

    #study-checkin .task-info {
        grid-template-columns: minmax(145px, .8fr) minmax(0, 1.5fr);
        row-gap: 2px;
    }

    #study-checkin .task-week {
        grid-column: 2;
    }
}

@media (max-width: 640px) {
    .header-content,
    main {
        padding-left: 14px;
        padding-right: 14px;
    }
    .sg-brand-row {
        align-items: flex-start;
    }
    .sg-brand-logo {
        width: 180px;
        max-width: 58vw;
    }
    .sg-brand-copy {
        display: none;
    }
    .summary-card {
        grid-template-columns: repeat(2, 1fr);
    }
    .summary-card > div:nth-child(2) {
        border-right: 0;
    }
    .summary-card > div:nth-child(-n+2) {
        border-bottom: 1px solid #e7efee;
    }
    .sg-accuracy-stat {
        justify-content: center;
    }
    .sg-search-hint {
        display: none;
    }

    #study-checkin .compact-body {
        padding: 0 8px 8px;
    }

    #study-checkin .task-card {
        flex-direction: row;
        align-items: center;
        padding: 8px 9px;
    }

    #study-checkin .task-info {
        grid-template-columns: 1fr;
        row-gap: 2px;
    }

    #study-checkin .task-module,
    #study-checkin .task-name,
    #study-checkin .task-week {
        grid-column: 1;
    }

    #study-checkin .task-name {
        white-space: normal;
        font-size: 12px;
    }

    #study-checkin .task-week {
        font-size: 9px;
    }

    #study-checkin .task-card > button {
        width: auto;
        min-width: 66px;
        padding: 5px 8px;
    }
}