frontend/static/css/style.css

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --bg: #fff2df;
    --panel: #fffaf2;
    --panel-soft: #fff6e8;
    --line: #6c4328;
    --text: #4a2b1a;
    --muted: #8a654f;
    --primary: #ff7f85;
    --primary-dark: #e7636d;
    --accent: #159947;
    --warning: #ffd84d;
    --shadow: 6px 7px 0 rgba(92, 55, 31, .92);
}

body {
    min-height: 100vh;
    max-width: 1180px;
    margin: 0 auto;
    padding: 28px 20px 44px;
    background:
        linear-gradient(180deg, #ff8a8e 0 128px, var(--bg) 128px);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Pretendard", sans-serif;
    line-height: 1.55;
    position: relative;
    overflow-x: hidden;
}

body::before {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    z-index: -1;
    width: 100%;
    height: 190px;
    pointer-events: none;
    background:
        radial-gradient(36px 80px at 7% 0, #fff2df 45%, transparent 47%),
        radial-gradient(44px 105px at 18% 0, #fff2df 45%, transparent 47%),
        radial-gradient(38px 92px at 33% 0, #fff2df 45%, transparent 47%),
        radial-gradient(48px 112px at 52% 0, #fff2df 45%, transparent 47%),
        radial-gradient(36px 82px at 66% 0, #fff2df 45%, transparent 47%),
        radial-gradient(42px 108px at 82% 0, #fff2df 45%, transparent 47%),
        radial-gradient(34px 78px at 96% 0, #fff2df 45%, transparent 47%),
        linear-gradient(#fff2df 0 84px, transparent 85px);
}

a {
    color: inherit;
    text-decoration: none;
}

[hidden] {
    display: none !important;
}

button,
select,
input {
    font: inherit;
}

button,
.button-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    border: 0;
    border: 2px solid var(--line);
    border-radius: 8px;
    padding: 0 18px;
    background: var(--primary);
    color: #ffffff;
    font-weight: 700;
    cursor: pointer;
    transition: background .18s ease, transform .18s ease, box-shadow .18s ease;
    box-shadow: 3px 4px 0 var(--line);
}

button:hover,
.button-link:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

button:active {
    transform: translateY(0);
}

button:disabled {
    cursor: not-allowed;
    opacity: .55;
    transform: none;
}

.main-ui {
    opacity: 1;
    transform: translateY(0);
    transition: opacity .5s ease, transform .5s ease;
}

.main-ui.is-hidden {
    opacity: 0;
    transform: translateY(12px);
    pointer-events: none;
}

.intro-overlay {
    position: fixed;
    inset: 0;
    z-index: 50;
    display: grid;
    place-items: center;
    background: rgba(245, 247, 251, .9);
    backdrop-filter: blur(12px);
    transition: opacity .45s ease, visibility .45s ease;
}

.intro-overlay.is-done {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.intro-content {
    display: grid;
    place-items: center;
}

.intro-start-btn {
    width: 104px;
    height: 104px;
    border-radius: 999px;
    padding: 0;
    background: var(--primary);
    color: #ffffff;
    box-shadow: 5px 6px 0 var(--line);
}

.intro-overlay.is-bursting .intro-start-btn {
    opacity: 0;
    transform: scale(.86);
}

.intro-dot {
    position: fixed;
    left: 50%;
    top: 50%;
    width: 7px;
    height: 7px;
    border-radius: 999px;
    background: var(--dot-color);
    transform: translate(-50%, -50%) scale(.4);
    animation: dotBurst .78s cubic-bezier(.16, 1, .3, 1) forwards;
    animation-delay: var(--dot-delay);
    pointer-events: none;
}

@keyframes dotBurst {
    0% {
        opacity: 0;
        transform: translate(-50%, -50%) scale(.25);
    }

    18% {
        opacity: 1;
    }

    100% {
        opacity: 0;
        transform:
            translate(calc(-50% + var(--dot-x)), calc(-50% + var(--dot-y)))
            scale(var(--dot-scale));
    }
}

.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    min-height: 64px;
    padding: 10px 14px;
    margin-bottom: 38px;
    background: rgba(255, 250, 242, .94);
    border: 3px solid var(--line);
    border-radius: 8px;
    box-shadow: 4px 5px 0 var(--line);
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
}

.brand-mark {
    display: grid;
    place-items: center;
    width: 34px;
    height: 34px;
    border-radius: 8px;
    background: var(--primary);
    color: #ffffff;
    font-size: 12px;
    letter-spacing: 0;
}

.navbar nav {
    display: flex;
    align-items: center;
    gap: 8px;
}

.navbar nav a {
    min-height: 38px;
    display: inline-flex;
    align-items: center;
    padding: 0 13px;
    border-radius: 8px;
    color: var(--muted);
    font-weight: 700;
}

.navbar nav a:hover {
    background: #ffe0e2;
    color: var(--text);
}

.navbar nav a[aria-current="page"] {
    background: var(--primary);
    color: #ffffff;
}

.home-hero {
    display: grid;
    align-items: start;
    min-height: 360px;
}

.home-hero h1 {
    max-width: 1040px;
    margin-top: 8px;
    font-size: 48px;
    line-height: 1.16;
    word-break: keep-all;
    overflow-wrap: break-word;
}

.home-hero p:not(.eyebrow) {
    max-width: 920px;
    margin-top: 16px;
    color: var(--muted);
    font-size: 18px;
    word-break: keep-all;
    overflow-wrap: break-word;
}

.home-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 28px;
}

.secondary-link {
    background: var(--panel);
    color: var(--text);
}

.page-heading {
    max-width: 980px;
    margin: 0 0 28px;
}

.page-heading.compact {
    margin-bottom: 22px;
}

.eyebrow {
    color: var(--primary-dark);
    font-size: 13px;
    font-weight: 800;
    letter-spacing: .06em;
    text-transform: uppercase;
}

.page-heading h1,
.detail-body h1 {
    margin-top: 6px;
    font-size: 42px;
    line-height: 1.18;
    letter-spacing: 0;
    word-break: keep-all;
    overflow-wrap: break-word;
}

.page-heading p:not(.eyebrow) {
    margin-top: 12px;
    color: var(--muted);
    font-size: 17px;
    word-break: keep-all;
    overflow-wrap: break-word;
}

.card,
.toolbar {
    background: var(--panel);
    border: 3px solid var(--line);
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.predict-layout {
    display: grid;
    grid-template-columns: minmax(0, 680px);
    justify-content: center;
    align-items: start;
    gap: 22px;
}

.predict-layout:has(#resultBox:not([hidden])) {
    grid-template-columns: minmax(0, 1.04fr) minmax(330px, .96fr);
}

.upload-box,
.result-card {
    padding: 22px;
}

.section-title {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 18px;
}

.section-title h2 {
    font-size: 21px;
    line-height: 1.25;
}

.section-title span {
    color: var(--muted);
    font-size: 13px;
    font-weight: 700;
    white-space: nowrap;
}

.upload-area {
    display: grid;
    place-items: center;
    min-height: clamp(300px, 35vw, 440px);
    margin-bottom: 16px;
    padding: 28px;
    border: 3px dashed rgba(108, 67, 40, .58);
    border-radius: 8px;
    background: var(--panel-soft);
    cursor: pointer;
    overflow: hidden;
    position: relative;
    transition: border-color .18s ease, background .18s ease;
}

.upload-area:hover,
.upload-area.is-dragging {
    border-color: var(--primary);
    background: #fff0f1;
}

.upload-area.has-image {
    padding: 0;
    border-style: solid;
    background: #ffffff;
}

.upload-area input {
    display: none;
}

.upload-area span {
    color: var(--muted);
    font-weight: 800;
    text-align: center;
}

.upload-area.has-image span {
    display: none;
}

#preview {
    display: none;
    width: 100%;
    height: 100%;
    min-height: clamp(300px, 35vw, 440px);
    padding: 12px;
    object-fit: contain;
}

#preview[src] {
    display: block;
}

#cameraPreview {
    width: 100%;
    height: 100%;
    min-height: clamp(300px, 35vw, 440px);
    object-fit: cover;
}

.upload-area.is-camera {
    padding: 0;
    border-style: solid;
    background: #ffffff;
}

.upload-area.is-camera span,
.upload-area.is-camera #preview {
    display: none;
}

.webcam-controls {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-bottom: 12px;
}

.result-card {
    min-height: clamp(300px, 35vw, 440px);
}

.result-summary {
    display: grid;
    gap: 6px;
    padding: 18px;
    margin-bottom: 16px;
    border-radius: 8px;
    background: #ffe0e2;
    border: 2px solid rgba(108, 67, 40, .2);
}

.result-summary span {
    font-size: clamp(34px, 5vw, 52px);
    line-height: 1;
    font-weight: 900;
    color: var(--primary);
}

.result-summary strong {
    color: var(--muted);
    font-size: 16px;
}

.score-list {
    display: grid;
    gap: 10px;
    list-style: none;
    margin-bottom: 18px;
}

.score-list li {
    display: grid;
    grid-template-columns: 44px 1fr 64px;
    align-items: center;
    gap: 10px;
    color: var(--muted);
    font-weight: 700;
}

.score-list .score-track {
    height: 8px;
    border-radius: 999px;
    background: #f1dcc7;
    overflow: hidden;
}

.score-list .score-bar {
    height: 100%;
    border-radius: inherit;
    background: var(--primary);
}

.result-row {
    display: flex;
    justify-content: space-between;
    gap: 18px;
    padding: 14px 0;
    border-bottom: 1px solid var(--line);
}

.result-row span {
    color: var(--muted);
    font-weight: 700;
}

.toolbar {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 14px;
    padding: 16px;
    margin-bottom: 22px;
}

.alphabet-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tab-chip {
    min-width: 42px;
    min-height: 42px;
    padding: 0 14px;
    background: #ffffff;
    color: var(--text);
}

.tab-chip.is-active {
    background: var(--primary);
    color: #ffffff;
}

.post-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 18px;
}

.post-card {
    display: grid;
    overflow: hidden;
    min-height: 100%;
    background: var(--panel);
    border: 3px solid var(--line);
    border-radius: 8px;
    color: inherit;
    box-shadow: 4px 5px 0 rgba(108, 67, 40, .9);
    transition: transform .18s ease, box-shadow .18s ease;
    animation: slideInFromRight .42s cubic-bezier(.16, 1, .3, 1) both;
    animation-delay: var(--card-delay, 0s);
}

.post-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow);
}

.post-card img {
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: cover;
    background: var(--panel-soft);
}

.post-image-link {
    display: block;
}

.post-body {
    display: grid;
    gap: 10px;
    padding: 16px;
}

.post-letter-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.post-letter {
    font-size: 34px;
    line-height: 1;
    font-weight: 900;
    color: var(--primary-dark);
}

.post-body h3 {
    font-size: 17px;
    line-height: 1.3;
}

.title-input {
    min-width: 0;
    height: 40px;
    padding: 0 11px;
    border: 2px solid rgba(108, 67, 40, .38);
    border-radius: 8px;
    background: #ffffff;
    color: var(--text);
    font-weight: 800;
}

.title-input:focus {
    border-color: var(--primary);
    outline: 3px solid rgba(255, 127, 133, .22);
}

.detail-link {
    color: var(--muted);
    font-size: 14px;
    font-weight: 800;
    text-decoration: underline;
    text-underline-offset: 3px;
}

.post-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.post-label {
    display: inline-flex;
    align-items: center;
    min-height: 30px;
    padding: 0 10px;
    border-radius: 999px;
    background: #ffe0e2;
    color: var(--text);
    font-weight: 800;
}

.post-confidence {
    color: var(--muted);
    font-weight: 800;
}

.confidence-badge {
    display: inline-flex;
    align-items: center;
    min-height: 30px;
    padding: 0 10px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 800;
    border: 2px solid rgba(108, 67, 40, .14);
}

.confidence-stable {
    background: #dff4e8;
    color: #1f6b3e;
}

.confidence-review {
    background: #fff1c8;
    color: #8f6510;
}

.confidence-retry {
    background: #ffe0e2;
    color: #a23c47;
}

.word-learning {
    display: grid;
    gap: 22px;
}

.word-input-panel {
    display: grid;
    gap: 8px;
    padding: 18px;
    background: var(--panel);
    border: 3px solid var(--line);
    border-radius: 8px;
    box-shadow: 4px 5px 0 rgba(108, 67, 40, .9);
}

.word-input-panel label {
    color: var(--muted);
    font-size: 13px;
    font-weight: 900;
    text-transform: uppercase;
}

.word-input-panel input {
    width: 100%;
    min-height: 48px;
    padding: 0 14px;
    border: 2px solid rgba(108, 67, 40, .28);
    border-radius: 8px;
    background: #ffffff;
    color: var(--text);
    font-size: 20px;
    font-weight: 900;
    text-transform: uppercase;
}

.practice-compare {
    display: grid;
    grid-template-columns: minmax(260px, .92fr) minmax(320px, 1.08fr);
    gap: 18px;
    align-items: stretch;
}

.letter-step {
    color: var(--muted);
    font-size: 13px;
    font-weight: 900;
}

.letter-controls {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.love-letters {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 12px;
}

.letter {
    display: grid;
    gap: 10px;
    padding: 18px;
    background: var(--panel);
    border: 3px solid var(--line);
    border-radius: 8px;
    box-shadow: 4px 5px 0 rgba(108, 67, 40, .9);
}

.letter h3 {
    color: var(--primary-dark);
    font-size: 34px;
    line-height: 1;
}

.letter img {
    width: 100%;
    aspect-ratio: 1 / 1;
    object-fit: contain;
    background: var(--panel-soft);
    border: 2px solid rgba(108, 67, 40, .22);
    border-radius: 8px;
}

.letter p,
.practice p,
footer p {
    color: var(--muted);
}

.letter-choice {
    cursor: pointer;
    gap: 8px;
    padding: 12px;
    text-align: left;
}

.letter-choice h3 {
    font-size: 28px;
}

.letter-choice p {
    font-size: 13px;
    font-weight: 800;
}

.letter-choice:hover {
    background: var(--panel-soft);
}

.letter-choice.is-active {
    outline: 3px solid var(--primary);
    outline-offset: 3px;
}

.practice {
    display: grid;
    gap: 14px;
    align-content: start;
    padding: 22px;
    background: var(--panel);
    border: 3px solid var(--line);
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.practice video,
.practice canvas {
    width: 100%;
    max-width: 640px;
    aspect-ratio: 4 / 3;
    object-fit: cover;
    transform: scaleX(-1);
    border-radius: 8px;
    background: var(--panel-soft);
    border: 2px solid rgba(108, 67, 40, .22);
}

.practice canvas {
    display: none;
}

footer {
    margin-top: 28px;
    text-align: center;
}

#loadMoreBtn {
    grid-column: 1 / -1;
    justify-self: center;
    min-width: 150px;
    margin-top: 6px;
}

.empty-state {
    grid-column: 1 / -1;
    padding: 34px 20px;
    text-align: center;
    color: var(--muted);
    background: var(--panel);
    border: 3px solid var(--line);
    border-radius: 8px;
}

.detail-shell {
    max-width: 960px;
    margin: 0 auto;
}

.detail-card {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(300px, .95fr);
    overflow: hidden;
}

.detail-image {
    width: 100%;
    height: 100%;
    min-height: 420px;
    object-fit: contain;
    background: var(--panel-soft);
    border-right: 1px solid var(--line);
}

.detail-body {
    padding: 26px;
}

.detail-body h1 {
    font-size: clamp(26px, 3vw, 38px);
}

.detail-title-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: start;
    gap: 14px;
    margin-bottom: 18px;
}

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

.detail-link-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 20px;
}

.detail-title-editor {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto auto;
    gap: 8px;
    margin-bottom: 18px;
}

.detail-title-editor button {
    min-height: 40px;
    padding: 0 12px;
}

.secondary-btn {
    background: var(--panel);
    color: var(--text);
}

.danger-btn {
    background: #b64040;
}

.danger-btn:hover {
    background: #983333;
}

@keyframes slideInFromRight {
    from {
        opacity: 0;
        transform: translateY(14px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 820px) {
    body {
        padding: 18px 14px 34px;
    }

    .navbar {
        align-items: flex-start;
        flex-direction: column;
        margin-bottom: 28px;
    }

    .home-hero {
        min-height: auto;
    }

    .home-hero h1 {
        font-size: 34px;
    }

    .page-heading h1,
    .detail-body h1 {
        font-size: 30px;
    }

    .predict-layout,
    .predict-layout:has(#resultBox:not([hidden])),
    .detail-card {
        grid-template-columns: 1fr;
    }

    .practice-compare {
        grid-template-columns: 1fr;
    }

    .detail-image {
        min-height: 300px;
        border-right: 0;
        border-bottom: 1px solid var(--line);
    }

    .toolbar {
        flex-direction: column;
        align-items: stretch;
        justify-content: stretch;
    }

    .alphabet-tabs {
        width: 100%;
    }

    .toolbar .button-link,
    .detail-link-row .button-link {
        width: 100%;
    }

    .detail-title-row,
    .detail-title-editor {
        grid-template-columns: 1fr;
    }

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