/* ==========================================================
   PROJECT 08 — VISION TRANSFORMER FRONTEND
   ========================================================== */

:root {
    --background: #07111f;
    --background-soft: #0c1a2d;
    --panel: rgba(17, 34, 57, 0.92);
    --panel-strong: #12253d;
    --border: rgba(148, 180, 218, 0.18);
    --text: #f3f7fc;
    --text-soft: #aabbd0;
    --primary: #79a7ff;
    --primary-strong: #4f82e8;
    --accent: #62ddc8;
    --success: #4bd6a0;
    --warning: #f2bd66;
    --danger: #ff7e86;
    --shadow: 0 24px 70px rgba(0, 0, 0, 0.32);
    --radius-large: 24px;
    --radius-medium: 16px;
    --radius-small: 10px;
    --page-width: 1180px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    min-height: 100vh;
    color: var(--text);
    background:
        radial-gradient(
            circle at 10% 0%,
            rgba(79, 130, 232, 0.22),
            transparent 34rem
        ),
        radial-gradient(
            circle at 90% 20%,
            rgba(98, 221, 200, 0.12),
            transparent 30rem
        ),
        var(--background);
    font-family:
        Inter,
        ui-sans-serif,
        system-ui,
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        sans-serif;
    line-height: 1.55;
}

button,
input {
    font: inherit;
}

button,
a {
    -webkit-tap-highlight-color: transparent;
}

button {
    color: inherit;
}

a {
    color: inherit;
}

img {
    display: block;
    max-width: 100%;
}

.hidden {
    display: none !important;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    border-bottom: 1px solid var(--border);
    background: rgba(7, 17, 31, 0.82);
    backdrop-filter: blur(18px);
}

.header-content {
    width: min(
        calc(100% - 40px),
        var(--page-width)
    );
    min-height: 72px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.brand-badge {
    display: grid;
    place-items: center;
    width: 42px;
    height: 42px;
    border-radius: 12px;
    color: #06101e;
    background:
        linear-gradient(
            135deg,
            var(--primary),
            var(--accent)
        );
    font-weight: 900;
}

.brand strong,
.brand small {
    display: block;
}

.brand strong {
    font-size: 0.98rem;
}

.brand small {
    color: var(--text-soft);
    font-size: 0.75rem;
}

.top-navigation {
    display: flex;
    align-items: center;
    gap: 22px;
}

.top-navigation a {
    color: var(--text-soft);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 650;
}

.top-navigation a:hover,
.top-navigation a:focus-visible {
    color: var(--text);
}

main {
    overflow: hidden;
}

.hero-section {
    width: min(
        calc(100% - 40px),
        var(--page-width)
    );
    min-height: 680px;
    margin: 0 auto;
    padding: 110px 0 90px;
    display: grid;
    grid-template-columns:
        minmax(0, 1.2fr)
        minmax(320px, 0.8fr);
    align-items: center;
    gap: 70px;
}

.eyebrow {
    margin: 0 0 12px;
    color: var(--accent);
    font-size: 0.78rem;
    font-weight: 850;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}

.hero-copy h1 {
    max-width: 770px;
    margin: 0;
    font-size: clamp(2.8rem, 6vw, 5.4rem);
    line-height: 0.98;
    letter-spacing: -0.055em;
}

.hero-copy h1 span {
    display: block;
    color: var(--primary);
}

.hero-description {
    max-width: 670px;
    margin: 28px 0 0;
    color: var(--text-soft);
    font-size: 1.12rem;
}

.hero-actions {
    margin-top: 34px;
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
}

.primary-link,
.secondary-link,
.primary-button,
.secondary-button {
    min-height: 48px;
    padding: 0 20px;
    border-radius: 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid transparent;
    font-weight: 800;
    text-decoration: none;
    cursor: pointer;
    transition:
        transform 160ms ease,
        background 160ms ease,
        border-color 160ms ease,
        opacity 160ms ease;
}

.primary-link,
.primary-button {
    color: #06101e;
    background:
        linear-gradient(
            135deg,
            var(--primary),
            var(--accent)
        );
}

.secondary-link,
.secondary-button {
    color: var(--text);
    border-color: var(--border);
    background: rgba(255, 255, 255, 0.04);
}

.primary-link:hover,
.secondary-link:hover,
.primary-button:hover:not(:disabled),
.secondary-button:hover:not(:disabled) {
    transform: translateY(-2px);
}

button:disabled {
    opacity: 0.48;
    cursor: not-allowed;
}

.hero-tags {
    margin-top: 34px;
    display: flex;
    flex-wrap: wrap;
    gap: 9px;
}

.hero-tags span {
    padding: 8px 12px;
    color: var(--text-soft);
    border: 1px solid var(--border);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.025);
    font-size: 0.8rem;
    font-weight: 700;
}

.hero-metrics {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}

.hero-metric {
    min-height: 175px;
    padding: 24px;
    border: 1px solid var(--border);
    border-radius: var(--radius-large);
    background:
        linear-gradient(
            145deg,
            rgba(24, 48, 79, 0.94),
            rgba(12, 27, 46, 0.94)
        );
    box-shadow: var(--shadow);
}

.hero-metric:nth-child(2),
.hero-metric:nth-child(4) {
    transform: translateY(22px);
}

.hero-metric span,
.hero-metric small {
    display: block;
    color: var(--text-soft);
}

.hero-metric strong {
    display: block;
    margin: 12px 0 6px;
    color: var(--accent);
    font-size: 2rem;
    line-height: 1;
}

.hero-metric small {
    font-size: 0.75rem;
}

.section {
    padding: 100px max(20px, calc((100% - var(--page-width)) / 2));
}

.alternate-section {
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    background: rgba(12, 26, 45, 0.68);
}

.section-heading {
    max-width: 760px;
    margin-bottom: 44px;
}

.section-heading h2 {
    margin: 0;
    font-size: clamp(2rem, 4vw, 3.3rem);
    line-height: 1.08;
    letter-spacing: -0.035em;
}

.section-heading > p:last-child {
    margin: 16px 0 0;
    color: var(--text-soft);
    font-size: 1.03rem;
}

.classifier-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 22px;
}

.panel {
    border: 1px solid var(--border);
    border-radius: var(--radius-large);
    background: var(--panel);
    box-shadow: var(--shadow);
}

.upload-panel,
.inference-panel {
    padding: 28px;
}

.panel-heading {
    margin-bottom: 24px;
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 18px;
}

.panel-heading > div {
    display: flex;
    align-items: center;
    gap: 12px;
}

.panel-heading h3,
.panel-heading p {
    margin: 0;
}

.panel-heading p {
    margin-top: 4px;
    color: var(--text-soft);
    font-size: 0.88rem;
}

.step-number {
    display: grid;
    place-items: center;
    flex: 0 0 auto;
    width: 34px;
    height: 34px;
    border-radius: 10px;
    color: var(--accent);
    background: rgba(98, 221, 200, 0.12);
    font-weight: 850;
}

.drop-zone {
    width: 100%;
    min-height: 290px;
    padding: 34px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    color: var(--text);
    border: 1.5px dashed rgba(121, 167, 255, 0.48);
    border-radius: 18px;
    background: rgba(79, 130, 232, 0.055);
    cursor: pointer;
}

.drop-zone:hover,
.drop-zone.dragging {
    border-color: var(--accent);
    background: rgba(98, 221, 200, 0.08);
}

.upload-icon {
    display: grid;
    place-items: center;
    width: 58px;
    height: 58px;
    margin-bottom: 8px;
    border-radius: 16px;
    color: #06101e;
    background:
        linear-gradient(
            135deg,
            var(--primary),
            var(--accent)
        );
    font-size: 1.6rem;
    font-weight: 900;
}

.drop-zone span,
.drop-zone small {
    color: var(--text-soft);
}

.preview-container {
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: 18px;
    background: rgba(0, 0, 0, 0.16);
}

.preview-container img {
    width: 100%;
    height: 290px;
    object-fit: contain;
    background: #050c16;
}

.preview-information {
    padding: 14px 16px;
    display: flex;
    justify-content: space-between;
    gap: 12px;
}

.preview-information span {
    color: var(--text-soft);
}

.domain-warning {
    margin: 18px 0 0;
    padding: 13px 15px;
    color: #ddc28d;
    border: 1px solid rgba(242, 189, 102, 0.2);
    border-radius: 12px;
    background: rgba(242, 189, 102, 0.065);
    font-size: 0.82rem;
}

.status-badge {
    padding: 7px 10px;
    border-radius: 999px;
    font-size: 0.73rem;
    font-weight: 850;
    white-space: nowrap;
}

.status-badge.neutral {
    color: var(--text-soft);
    background: rgba(255, 255, 255, 0.06);
}

.status-badge.loading {
    color: #e9c579;
    background: rgba(242, 189, 102, 0.12);
}

.status-badge.ready {
    color: var(--success);
    background: rgba(75, 214, 160, 0.11);
}

.status-badge.error {
    color: var(--danger);
    background: rgba(255, 126, 134, 0.11);
}

.runtime-status {
    min-height: 92px;
    padding: 18px;
    display: flex;
    align-items: flex-start;
    gap: 14px;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.025);
}

.status-dot {
    flex: 0 0 auto;
    width: 12px;
    height: 12px;
    margin-top: 6px;
    border-radius: 50%;
    background: var(--text-soft);
    box-shadow: 0 0 0 6px rgba(170, 187, 208, 0.08);
}

.runtime-status.loading .status-dot {
    background: var(--warning);
    animation: pulse 1.1s infinite;
}

.runtime-status.ready .status-dot {
    background: var(--success);
}

.runtime-status.error .status-dot {
    background: var(--danger);
}

.runtime-status strong {
    display: block;
}

.runtime-status p {
    margin: 5px 0 0;
    color: var(--text-soft);
    font-size: 0.84rem;
}

@keyframes pulse {
    50% {
        opacity: 0.35;
    }
}

.model-information-grid {
    margin-top: 18px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.model-information-grid > div {
    padding: 15px;
    border: 1px solid var(--border);
    border-radius: 13px;
    background: rgba(255, 255, 255, 0.025);
}

.model-information-grid span,
.model-information-grid strong {
    display: block;
}

.model-information-grid span {
    color: var(--text-soft);
    font-size: 0.73rem;
}

.model-information-grid strong {
    margin-top: 4px;
    font-size: 0.92rem;
}

.inference-actions {
    margin-top: 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.prediction-results {
    margin-top: 22px;
    padding-top: 22px;
    border-top: 1px solid var(--border);
}

.prediction-summary {
    padding: 20px;
    border: 1px solid rgba(98, 221, 200, 0.22);
    border-radius: 17px;
    background:
        linear-gradient(
            135deg,
            rgba(98, 221, 200, 0.1),
            rgba(79, 130, 232, 0.08)
        );
}

.prediction-summary > span {
    color: var(--text-soft);
    font-size: 0.76rem;
}

.prediction-summary strong {
    display: block;
    margin: 7px 0 10px;
    color: var(--accent);
    font-size: 2rem;
    text-transform: capitalize;
}

.prediction-summary > div {
    display: flex;
    justify-content: space-between;
    color: var(--text-soft);
    font-size: 0.82rem;
}

.prediction-results h4 {
    margin: 22px 0 12px;
}

.prediction-list {
    display: grid;
    gap: 10px;
}

.prediction-row {
    display: grid;
    grid-template-columns: 105px 1fr 68px;
    align-items: center;
    gap: 12px;
}

.prediction-label {
    text-transform: capitalize;
    font-weight: 720;
}

.prediction-track {
    height: 9px;
    overflow: hidden;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.08);
}

.prediction-fill {
    height: 100%;
    border-radius: inherit;
    background:
        linear-gradient(
            90deg,
            var(--primary),
            var(--accent)
        );
}

.prediction-percentage {
    color: var(--text-soft);
    text-align: right;
    font-variant-numeric: tabular-nums;
}

.metric-card-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.metric-card {
    min-height: 170px;
    padding: 24px;
    border: 1px solid var(--border);
    border-radius: 20px;
    background: var(--panel);
}

.metric-card.featured {
    border-color: rgba(98, 221, 200, 0.26);
    background:
        linear-gradient(
            145deg,
            rgba(30, 68, 89, 0.96),
            rgba(14, 35, 56, 0.96)
        );
}

.metric-card span,
.metric-card small {
    display: block;
    color: var(--text-soft);
}

.metric-card strong {
    display: block;
    margin: 18px 0 7px;
    color: var(--accent);
    font-size: 2.1rem;
}

.table-panel {
    margin-top: 24px;
    padding: 28px;
}

.table-wrapper {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    min-width: 760px;
}

th,
td {
    padding: 14px;
    border-bottom: 1px solid var(--border);
    text-align: left;
}

th {
    color: var(--text-soft);
    font-size: 0.75rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

td {
    font-variant-numeric: tabular-nums;
}

.chart-gallery {
    margin-top: 24px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.chart-card {
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: 20px;
    background: var(--panel);
}

.chart-card img {
    width: 100%;
    aspect-ratio: 1.25;
    object-fit: contain;
    background: #fff;
}

.chart-card div {
    padding: 16px;
}

.chart-card strong {
    display: block;
}

.chart-card span {
    color: var(--text-soft);
    font-size: 0.82rem;
}

.attention-summary {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
}

.attention-summary article {
    padding: 20px;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: var(--panel);
}

.attention-summary span,
.attention-summary strong {
    display: block;
}

.attention-summary span {
    color: var(--text-soft);
    font-size: 0.78rem;
}

.attention-summary strong {
    margin-top: 8px;
    color: var(--primary);
    font-size: 1.5rem;
}

.attention-grid-images {
    margin-top: 22px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.image-panel {
    margin: 0;
    overflow: hidden;
}

.image-panel img {
    width: 100%;
    background: #fff;
}

.image-panel figcaption {
    padding: 16px;
    color: var(--text-soft);
    text-align: center;
}

.gallery-filter {
    margin: 32px 0 18px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.filter-button {
    padding: 9px 15px;
    color: var(--text-soft);
    border: 1px solid var(--border);
    border-radius: 999px;
    background: transparent;
    cursor: pointer;
}

.filter-button.active {
    color: #06101e;
    border-color: transparent;
    background: var(--accent);
    font-weight: 800;
}

.attention-gallery {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.attention-card {
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: var(--panel);
}

.attention-card img {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    background: #fff;
}

.attention-card-content {
    padding: 14px;
}

.attention-card-content strong {
    display: block;
    text-transform: capitalize;
}

.attention-card-content span {
    display: block;
    margin-top: 3px;
    color: var(--text-soft);
    font-size: 0.78rem;
}

.result-pill {
    display: inline-flex !important;
    width: max-content;
    margin-bottom: 8px;
    padding: 4px 8px;
    border-radius: 999px;
    font-size: 0.66rem !important;
    font-weight: 850;
    text-transform: uppercase;
}

.result-pill.correct {
    color: var(--success);
    background: rgba(75, 214, 160, 0.1);
}

.result-pill.incorrect {
    color: var(--danger);
    background: rgba(255, 126, 134, 0.1);
}

.methodology-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.method-card {
    padding: 24px;
    border: 1px solid var(--border);
    border-radius: 19px;
    background: var(--panel);
}

.method-card > span {
    color: var(--primary);
    font-size: 0.8rem;
    font-weight: 900;
}

.method-card h3 {
    margin: 12px 0 10px;
}

.method-card p {
    margin: 0;
    color: var(--text-soft);
    font-size: 0.9rem;
}

.limitations-panel {
    margin-top: 24px;
    padding: 28px;
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    gap: 38px;
}

.limitations-panel h3 {
    margin: 0;
}

.limitations-panel p {
    color: var(--text-soft);
}

.limitations-panel ul {
    margin: 0;
    padding-left: 20px;
}

.limitations-panel li {
    margin-bottom: 10px;
    color: var(--text-soft);
}

footer {
    padding: 38px 20px;
    border-top: 1px solid var(--border);
    color: var(--text-soft);
    text-align: center;
    font-size: 0.82rem;
}

footer p {
    margin: 4px 0;
}

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

    .hero-section {
        gap: 45px;
    }

    .metric-card-grid,
    .methodology-grid {
        grid-template-columns: 1fr 1fr;
    }

    .attention-gallery {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 760px) {
    .top-navigation {
        display: none;
    }

    .hero-section {
        min-height: auto;
        padding-top: 75px;
    }

    .hero-metrics,
    .chart-gallery,
    .attention-grid-images,
    .limitations-panel {
        grid-template-columns: 1fr;
    }

    .hero-metric:nth-child(2),
    .hero-metric:nth-child(4) {
        transform: none;
    }

    .metric-card-grid,
    .attention-summary {
        grid-template-columns: 1fr 1fr;
    }

    .attention-gallery {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 520px) {
    .header-content {
        width: min(
            calc(100% - 24px),
            var(--page-width)
        );
    }

    .hero-section,
    .section {
        padding-left: 14px;
        padding-right: 14px;
    }

    .hero-section {
        width: 100%;
    }

    .hero-copy h1 {
        font-size: 2.65rem;
    }

    .metric-card-grid,
    .attention-summary,
    .attention-gallery,
    .model-information-grid,
    .inference-actions {
        grid-template-columns: 1fr;
    }

    .upload-panel,
    .inference-panel,
    .table-panel {
        padding: 20px;
    }

    .preview-information {
        flex-direction: column;
    }

    .prediction-row {
        grid-template-columns: 90px 1fr 58px;
        gap: 8px;
        font-size: 0.82rem;
    }
}