:root {
    --bg: #f8f7f2;
    --paper: #fffdf8;
    --ink: #1d2a26;
    --muted: #5f6f68;
    --accent: #256f4e;
    --accent-2: #d67c2d;
    --line: #dde6df;
    --shadow: 0 14px 36px rgba(30, 48, 40, 0.12);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Noto Sans SC", sans-serif;
    color: var(--ink);
    background:
        radial-gradient(1200px 600px at 10% -10%, rgba(37, 111, 78, 0.1), transparent 60%),
        radial-gradient(1000px 500px at 90% 0%, rgba(214, 124, 45, 0.1), transparent 55%),
        var(--bg);
    min-height: 100vh;
}

.bg-orb {
    position: fixed;
    z-index: -1;
    border-radius: 50%;
    filter: blur(40px);
    opacity: 0.35;
}

.orb-a {
    width: 340px;
    height: 340px;
    background: #83b891;
    top: -120px;
    left: -100px;
}

.orb-b {
    width: 300px;
    height: 300px;
    background: #efbc8e;
    right: -80px;
    bottom: 12%;
}

.nav-glass {
    backdrop-filter: blur(8px);
    background: rgba(255, 253, 248, 0.86);
    border-bottom: 1px solid rgba(153, 173, 163, 0.45);
}

.brand-title {
    font-family: "ZCOOL XiaoWei", serif;
    letter-spacing: 0.4px;
    color: var(--accent);
}

.card-soft {
    border: 1px solid var(--line);
    background: var(--paper);
    border-radius: 18px;
    box-shadow: var(--shadow);
}

.hero {
    position: relative;
    overflow: hidden;
    border-radius: 20px;
    border: 1px solid #d8e4dc;
    background: linear-gradient(130deg, #edf6ef, #fff8ef);
    box-shadow: var(--shadow);
}

.hero-title {
    font-size: clamp(1.5rem, 3vw, 2.2rem);
    font-weight: 900;
    line-height: 1.25;
}

.hero-subtitle {
    color: var(--muted);
}

.stat-box {
    border: 1px dashed #cddbd2;
    border-radius: 14px;
    padding: 16px;
    background: rgba(255, 255, 255, 0.7);
}

.stat-value {
    font-size: 1.45rem;
    font-weight: 800;
    color: var(--accent);
}

.btn-main {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

.btn-main:hover {
    background: #1f5c40;
    border-color: #1f5c40;
    color: #fff;
}

.btn-warm {
    background: var(--accent-2);
    border-color: var(--accent-2);
    color: #fff;
}

.btn-warm:hover {
    background: #b86622;
    border-color: #b86622;
    color: #fff;
}

.table thead th {
    white-space: nowrap;
}

.bird-cover {
    width: 100%;
    max-height: 420px;
    object-fit: cover;
    border-radius: 16px;
    border: 1px solid #dde6df;
}

.quiz-option {
    border: 1px solid #d7e0da;
    border-radius: 14px;
    padding: 10px 12px;
    margin-bottom: 10px;
    background: #fff;
    transition: all 0.2s ease;
}

.quiz-option:hover {
    border-color: var(--accent);
    transform: translateY(-1px);
}

.quiz-option input {
    margin-right: 10px;
}

.quiz-image {
    width: 100%;
    max-height: 360px;
    object-fit: cover;
    background: #f4f6f4;
}

.quiz-start-stack,
.quiz-action-stack,
.study-card-actions {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.quiz-score-badge {
    background: rgba(37, 111, 78, 0.1);
    color: var(--accent);
    border: 1px solid rgba(37, 111, 78, 0.14);
    border-radius: 999px;
    padding: 8px 14px;
    font-weight: 700;
}

.quiz-main-stack {
    max-width: 100%;
}

.quiz-media-frame {
    position: relative;
    width: 100%;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: #f3f6f3;
    overflow: hidden;
}

.quiz-media-image {
    display: block;
    width: 100%;
    max-height: min(52vh, 460px);
    object-fit: contain;
    background: #eef3ef;
}

.quiz-reveal-card {
    border: 1px solid var(--line);
    border-radius: 18px;
    padding: 18px;
    background: rgba(255, 255, 255, 0.85);
}

.quiz-form-stack {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.study-pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: rgba(37, 111, 78, 0.08);
    color: var(--accent);
    border-radius: 999px;
    padding: 6px 12px;
    font-size: 0.88rem;
    font-weight: 700;
}

.flip-scene {
    perspective: 1200px;
    width: 100%;
}

.quiz-card-scene {
    height: min(52vh, 420px);
}

.study-card-scene {
    height: clamp(300px, 44vh, 400px);
}

.flip-card {
    position: relative;
    width: 100%;
    height: 100%;
    transform-style: preserve-3d;
    transition: transform 0.65s ease;
}

.flip-card.can-flip {
    cursor: pointer;
}

.flip-card.is-flipped {
    transform: rotateY(180deg);
}

.flip-face {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    border-radius: 22px;
    overflow: hidden;
}

.flip-back {
    transform: rotateY(180deg);
}

.media-card-shell,
.answer-card-back {
    position: relative;
    width: 100%;
    height: 100%;
    border: 1px solid var(--line);
    border-radius: 22px;
    overflow: hidden;
    background: var(--paper);
    box-shadow: var(--shadow);
}

.answer-card-back {
    display: flex;
    align-items: stretch;
    justify-content: center;
    padding: 20px;
    overflow: hidden;
    background:
        radial-gradient(120% 180% at 0% 0%, rgba(37, 111, 78, 0.08), transparent 55%),
        var(--paper);
}

.answer-card-main {
    display: grid;
    grid-template-columns: 1fr;
    grid-template-areas:
        "pill"
        "name"
        "meta"
        "actions"
        "secondary";
    grid-template-rows: auto;
    align-content: stretch;
    align-items: start;
    gap: 12px;
    width: 100%;
    min-height: 0;
}

.answer-card-main > .study-pill {
    grid-area: pill;
    width: fit-content;
}

.answer-name-wrap {
    grid-area: name;
    min-height: 0;
}

.answer-name-wrap h3 {
    font-size: clamp(1.1rem, 1.5vw, 1.45rem);
    line-height: 1.25;
    word-break: break-word;
}

.quiz-media-cover {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
    background: #eef3ef;
}

.media-card-caption {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    padding: 16px 18px;
    color: #fff;
    font-size: 0.95rem;
    background: linear-gradient(180deg, rgba(13, 18, 16, 0), rgba(13, 18, 16, 0.7));
}

.audio-fab {
    position: absolute;
    top: 14px;
    left: 14px;
    z-index: 2;
    width: 44px;
    height: 44px;
    border: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.92);
    color: var(--accent);
    font-size: 1.1rem;
    font-weight: 800;
    box-shadow: 0 10px 24px rgba(0, 0, 0, 0.12);
}

.audio-fab:hover {
    background: #fff;
}

.audio-fab:disabled,
.audio-fab.is-disabled {
    background: rgba(255, 255, 255, 0.7);
    color: #8fa49a;
    cursor: not-allowed;
    box-shadow: none;
}

.latin-name {
    color: var(--accent);
    font-size: 1.05rem;
    font-style: italic;
}

.answer-panel {
    border-radius: 18px;
    padding: 18px;
    border: 1px solid #dce6df;
}

.answer-panel-title {
    font-size: 1.05rem;
    font-weight: 800;
    margin-bottom: 10px;
}

.answer-panel-correct {
    background: rgba(37, 111, 78, 0.08);
    border-color: rgba(37, 111, 78, 0.18);
}

.answer-panel-wrong {
    background: rgba(214, 124, 45, 0.08);
    border-color: rgba(214, 124, 45, 0.18);
}

.map-box {
    width: 100%;
    height: 520px;
    border-radius: 18px;
    border: 1px solid #d4dfd8;
    background: #fff;
}

.small-muted {
    color: var(--muted);
    font-size: 0.92rem;
}

.toast-stack {
    position: fixed;
    top: 84px;
    right: 20px;
    z-index: 1080;
    display: flex;
    flex-direction: column;
    gap: 12px;
    pointer-events: none;
}

.flash-toast {
    min-width: 240px;
    max-width: 320px;
    border-radius: 18px;
    padding: 14px 16px;
    color: #fff;
    box-shadow: 0 16px 30px rgba(18, 28, 23, 0.18);
    opacity: 0;
    transform: translateY(-8px) scale(0.96);
    transition: opacity 0.25s ease, transform 0.25s ease;
}

.flash-toast.is-visible {
    opacity: 1;
    transform: translateY(0) scale(1);
}

.flash-toast-success,
.flash-toast-info {
    background: linear-gradient(135deg, #256f4e, #338961);
}

.flash-toast-title {
    font-size: 0.85rem;
    opacity: 0.85;
    margin-bottom: 4px;
}

.study-filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.study-filter-main {
    flex: 1 1 280px;
}

.study-filter-side {
    flex: 1 1 360px;
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.study-filter-side .form-select {
    flex: 1 1 150px;
}

.study-deck-shell {
    position: relative;
    overflow: hidden;
}

.study-page-shell {
    width: 100%;
    max-width: min(980px, 100%);
    margin: 0 auto;
}

.study-deck-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
}

.study-round-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
}

.study-round-badge {
    display: inline-flex;
    align-items: center;
    border-radius: 999px;
    padding: 6px 12px;
    font-size: 0.86rem;
    font-weight: 700;
    color: #fff;
    background: linear-gradient(120deg, #256f4e, #d67c2d);
    box-shadow: 0 8px 18px rgba(24, 43, 35, 0.16);
}

.study-counter {
    border-radius: 999px;
    padding: 8px 14px;
    font-weight: 700;
    background: rgba(37, 111, 78, 0.08);
    color: var(--accent);
    white-space: nowrap;
    flex-shrink: 0;
}

.study-progress {
    width: 100%;
    height: 8px;
    border-radius: 999px;
    background: #e7efe9;
    overflow: hidden;
}

.study-progress-bar {
    height: 100%;
    border-radius: inherit;
    background: linear-gradient(90deg, #256f4e, #63a680);
    transition: width 0.28s ease;
}

.study-deck-stage {
    position: relative;
    min-height: 0;
    width: 100%;
}

.study-deck-card {
    display: none;
    width: 100%;
}

.study-deck-card.is-active {
    display: block;
    animation: studyCardEnter 0.28s ease;
}

.study-meta-list {
    grid-area: meta;
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
    font-size: 0.9rem;
    align-content: start;
}

.study-meta-list > div {
    border: 1px solid #d4e0d8;
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.82);
    padding: 10px 12px;
    min-width: 0;
}

.study-card-actions-row {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    margin: 0;
}

.study-card-actions-row form {
    margin: 0;
}

.study-card-actions-row .btn {
    width: 100%;
    min-width: 0;
}

.answer-card-main > .study-card-actions-row:nth-of-type(1) {
    grid-area: actions;
}

.answer-card-main > .study-card-actions-row:nth-of-type(2) {
    grid-area: secondary;
}

.answer-card-main > .study-card-actions-row:nth-of-type(1) form,
.answer-card-main > .study-card-actions-row:nth-of-type(1) > a,
.answer-card-main > .study-card-actions-row:nth-of-type(1) > button {
    width: 100%;
}

.study-remember-inline {
    display: none !important;
}

.study-deck-controls {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
}

.study-deck-controls .btn,
.study-deck-controls a.btn {
    width: 100%;
    min-width: 0;
    min-height: 46px;
}

.study-deck-controls .btn:disabled {
    opacity: 0.55;
    cursor: not-allowed;
}

.study-focus-controls {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

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

.remember-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 14px;
}

.remember-item {
    border: 1px solid var(--line);
    border-radius: 16px;
    background: #fff;
    overflow: hidden;
    box-shadow: 0 8px 20px rgba(18, 33, 27, 0.08);
}

.remember-item img {
    width: 100%;
    height: 150px;
    object-fit: cover;
    background: #eef3ef;
}

.remember-item-body {
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.remember-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.remember-actions form {
    margin: 0;
}

.study-preview-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    max-height: min(56vh, 520px);
    overflow: auto;
}

.study-preview-item {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    padding: 10px;
    border-radius: 16px;
    border: 1px solid #d9e4dd;
    background: #fff;
    transition: all 0.2s ease;
    text-align: left;
}

.study-preview-item img {
    width: 52px;
    height: 52px;
    object-fit: cover;
    border-radius: 12px;
    flex: 0 0 auto;
}

.study-preview-item span {
    color: var(--ink);
    font-weight: 600;
}

.study-preview-item:hover,
.study-preview-item.is-active {
    border-color: rgba(37, 111, 78, 0.25);
    transform: translateY(-1px);
    box-shadow: 0 10px 22px rgba(23, 37, 30, 0.08);
}

@keyframes studyCardEnter {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 767.98px) {
    .map-box {
        height: 360px;
    }

    .quiz-card-scene,
    .study-card-scene {
        height: clamp(300px, 50vh, 380px);
    }

    .study-deck-stage {
        min-height: 0;
    }

    .media-card-shell,
    .answer-card-back {
        border-radius: 16px;
    }

    .answer-card-back {
        padding: 12px;
    }

    .answer-name-wrap h3 {
        font-size: 1.12rem;
    }

    .answer-card-main {
        grid-template-columns: 1fr;
        grid-template-areas:
            "pill"
            "name"
            "meta"
            "actions"
            "secondary";
        grid-template-rows: auto;
        gap: 10px;
    }

    .study-meta-list {
        grid-template-columns: 1fr;
        font-size: 0.86rem;
        gap: 8px;
    }

    .study-meta-list > div {
        padding: 8px 10px;
    }

    .answer-card-main > .study-card-actions-row:nth-of-type(1),
    .answer-card-main > .study-card-actions-row:nth-of-type(2) {
        flex-direction: column;
        gap: 8px;
    }

    .media-card-caption {
        padding: 12px 14px;
        font-size: 0.76rem;
    }

    .audio-fab {
        top: 10px;
        left: 10px;
        width: 38px;
        height: 38px;
        font-size: 1rem;
    }

    .remember-grid {
        grid-template-columns: 1fr;
    }

    .study-deck-controls {
        gap: 8px;
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .study-deck-controls .btn,
    .study-deck-controls a.btn {
        min-width: 0;
        padding-left: 10px;
        padding-right: 10px;
    }

    .study-focus-controls {
        grid-template-columns: 1fr;
    }

    .study-round-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: 6px;
    }

    .study-deck-top {
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
    }

    .study-counter {
        align-self: flex-end;
    }

    .quiz-score-badge,
    .study-counter {
        font-size: 0.9rem;
        padding: 6px 10px;
    }

    .quiz-media-image {
        max-height: min(34vh, 240px);
    }

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

    .card-soft {
        border-radius: 14px;
    }

    main.container {
        padding-left: 12px;
        padding-right: 12px;
    }

    .study-filter-side {
        flex: 1 1 100%;
    }

    .toast-stack {
        left: 12px;
        right: 12px;
        top: 76px;
    }

    .flash-toast {
        max-width: none;
    }
}

@media (min-width: 768px) and (max-width: 991.98px) {
    .answer-card-main {
        grid-template-columns: 1fr;
        grid-template-areas:
            "pill"
            "name"
            "meta"
            "actions"
            "secondary";
        grid-template-rows: auto;
    }

    .answer-card-main > .study-card-actions-row:nth-of-type(1),
    .answer-card-main > .study-card-actions-row:nth-of-type(2) {
        flex-direction: column;
        gap: 8px;
    }

    .answer-card-main > .study-card-actions-row:nth-of-type(2) .btn {
        min-height: 40px;
    }

    .study-deck-controls .btn,
    .study-deck-controls a.btn {
        min-width: 0;
    }

    .study-focus-controls {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}

/* Innovation: migration map + share card + passport */
.passport-stat-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(110px, 1fr));
    gap: 8px;
}

.passport-stat-item {
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 8px 10px;
    background: rgba(255, 255, 255, 0.72);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.passport-stat-item span {
    color: var(--muted);
    font-size: 0.86rem;
}

.passport-stat-item strong {
    color: var(--accent);
    font-size: 1.05rem;
}

.achievement-item {
    border: 1px dashed #c4d2c8;
    border-radius: 14px;
    padding: 12px;
    background: #fcfdfb;
}

.achievement-item.is-unlocked {
    border-style: solid;
    border-color: #84b496;
    background: linear-gradient(135deg, #ecf6ef, #fff9f2);
}

.achievement-title {
    font-weight: 700;
}

.passport-stamp-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
    gap: 12px;
}

.passport-stamp {
    border: 1px solid #d7e2db;
    border-radius: 12px;
    padding: 12px;
    background: #fff;
}

.passport-stamp-name {
    font-weight: 700;
    color: var(--ink);
}

.passport-date {
    margin-top: 6px;
    color: var(--muted);
    font-size: 0.85rem;
}

.bird-poster {
    border: 1px solid #d8e2db;
    border-radius: 20px;
    overflow: hidden;
    background: linear-gradient(140deg, #f7faf7, #fff7ef);
    box-shadow: var(--shadow);
}

.bird-poster-image-wrap {
    max-height: 420px;
    overflow: hidden;
    border-bottom: 1px solid #dbe5de;
}

.bird-poster-image {
    display: block;
    width: 100%;
    object-fit: cover;
}

.bird-poster-placeholder {
    display: grid;
    place-items: center;
    height: 300px;
    color: var(--muted);
}

.bird-poster-body {
    padding: 16px;
}

.bird-poster-kicker {
    letter-spacing: 0.08em;
    color: var(--accent);
    font-size: 0.82rem;
    font-weight: 700;
    text-transform: uppercase;
}

.bird-poster-quote {
    margin: 0;
    border-left: 3px solid rgba(37, 111, 78, 0.4);
    padding-left: 12px;
    color: #2b443a;
}

.bird-poster-fact {
    font-size: 0.92rem;
    color: var(--muted);
}

.bird-poster-meta {
    font-size: 0.88rem;
    color: #476053;
}

@media (max-width: 768px) {
    #migrationMap {
        height: 320px !important;
    }

    .passport-stat-grid {
        width: 100%;
    }

    #migrationForm .form-label {
        margin-bottom: 4px;
    }

    #migrationForm .btn {
        min-height: 42px;
    }

    .autocomplete-panel {
        max-height: 220px;
    }

    .migration-record-list {
        max-height: 320px;
    }

    .migration-record-item {
        padding: 9px;
    }

    .migration-record-line {
        flex-direction: column;
        align-items: flex-start;
        gap: 2px;
        margin-bottom: 6px;
    }

    .migration-record-line strong {
        text-align: left;
    }
}

#migrationMap {
    width: 100%;
    overflow: hidden;
    touch-action: pan-y;
}

.migration-record-list {
    max-height: 520px;
    overflow: auto;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.migration-record-block {
    margin: 0;
    border: 1px solid #d7e2db;
    border-radius: 10px;
    background: #fbfdfb;
    padding: 10px;
    font-size: 0.78rem;
    line-height: 1.35;
}

.autocomplete-panel {
    position: absolute;
    left: 0;
    right: 0;
    top: calc(100% + 4px);
    z-index: 40;
    border: 1px solid #d7e2db;
    border-radius: 10px;
    background: #fff;
    box-shadow: 0 8px 20px rgba(25, 44, 36, 0.14);
    max-height: 280px;
    overflow: auto;
}

.autocomplete-item {
    width: 100%;
    border: 0;
    border-bottom: 1px solid #eef3ef;
    background: #fff;
    text-align: left;
    padding: 10px 12px;
    font-size: 0.92rem;
    color: var(--ink);
}

.autocomplete-item:last-child {
    border-bottom: 0;
}

.autocomplete-item:hover,
.autocomplete-item.is-active {
    background: #eef6f1;
}

.auto-main {
    font-size: 0.92rem;
    font-weight: 600;
    color: var(--ink);
}

.auto-sub {
    font-size: 0.78rem;
    color: var(--muted);
    margin-top: 2px;
}

.migration-record-item {
    border: 1px solid #d7e2db;
    border-radius: 10px;
    padding: 10px;
    background: #fbfdfb;
}

.migration-record-head {
    font-weight: 700;
    margin-bottom: 6px;
}

.migration-record-line {
    display: flex;
    justify-content: space-between;
    gap: 8px;
    font-size: 0.82rem;
    margin-bottom: 3px;
}

.migration-record-line span {
    color: var(--muted);
    white-space: nowrap;
}

.migration-record-line strong {
    font-weight: 500;
    text-align: right;
    word-break: break-word;
}