:root {
    color-scheme: light;
    --bg: #f5f5f7;
    --panel: rgba(255, 255, 255, 0.8);
    --panel-strong: rgba(255, 255, 255, 0.94);
    --text: #111214;
    --muted: #6e727b;
    --line: rgba(17, 18, 20, 0.08);
    --accent: #0a84ff;
    --accent-dark: #0066cc;
    --shadow: 0 30px 80px rgba(17, 18, 20, 0.08);
    --page-gradient-start: #fbfbfd;
    --page-gradient-end: #eef1f4;
    --topbar-pill: rgba(255, 255, 255, 0.72);
    --hero-border: rgba(255, 255, 255, 0.6);
    --card-shadow: 0 22px 50px rgba(17, 18, 20, 0.06);
    --format-bg: rgba(255, 255, 255, 0.72);
    --input-bg: #ffffff;
    --input-border: rgba(17, 18, 20, 0.12);
    --dropzone-glow: rgba(255, 255, 255, 0.96);
    --dropzone-start: rgba(249, 250, 252, 0.96);
    --dropzone-end: rgba(241, 244, 248, 0.9);
    --badge-bg: rgba(17, 18, 20, 0.05);
    --badge-text: #3b4049;
    --file-pill-bg: rgba(10, 132, 255, 0.07);
    --file-pill-text: #23415d;
    --danger: #b42318;
    --danger-bg: rgba(180, 35, 24, 0.08);
    --danger-text: #8f1f13;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        color-scheme: dark;
        --bg: #101318;
        --panel: rgba(21, 25, 32, 0.78);
        --panel-strong: rgba(24, 29, 38, 0.94);
        --text: #f4f7fb;
        --muted: #a3adbb;
        --line: rgba(239, 244, 251, 0.11);
        --accent: #68a9ff;
        --accent-dark: #1f7eea;
        --shadow: 0 34px 90px rgba(0, 0, 0, 0.46);
        --page-gradient-start: #151922;
        --page-gradient-end: #0c0f14;
        --topbar-pill: rgba(24, 29, 38, 0.7);
        --hero-border: rgba(239, 244, 251, 0.09);
        --card-shadow: 0 24px 56px rgba(0, 0, 0, 0.32);
        --format-bg: rgba(18, 22, 29, 0.76);
        --input-bg: #10151d;
        --input-border: rgba(239, 244, 251, 0.14);
        --dropzone-glow: rgba(42, 69, 102, 0.32);
        --dropzone-start: rgba(25, 32, 43, 0.98);
        --dropzone-end: rgba(15, 20, 28, 0.95);
        --badge-bg: rgba(239, 244, 251, 0.08);
        --badge-text: #d5deea;
        --file-pill-bg: rgba(104, 169, 255, 0.14);
        --file-pill-text: #d9e9ff;
        --danger: #ffb3aa;
        --danger-bg: rgba(255, 128, 116, 0.14);
        --danger-text: #ffd2cc;
    }
}

:root[data-theme="dark"] {
    color-scheme: dark;
    --bg: #101318;
    --panel: rgba(21, 25, 32, 0.78);
    --panel-strong: rgba(24, 29, 38, 0.94);
    --text: #f4f7fb;
    --muted: #a3adbb;
    --line: rgba(239, 244, 251, 0.11);
    --accent: #68a9ff;
    --accent-dark: #1f7eea;
    --shadow: 0 34px 90px rgba(0, 0, 0, 0.46);
    --page-gradient-start: #151922;
    --page-gradient-end: #0c0f14;
    --topbar-pill: rgba(24, 29, 38, 0.7);
    --hero-border: rgba(239, 244, 251, 0.09);
    --card-shadow: 0 24px 56px rgba(0, 0, 0, 0.32);
    --format-bg: rgba(18, 22, 29, 0.76);
    --input-bg: #10151d;
    --input-border: rgba(239, 244, 251, 0.14);
    --dropzone-glow: rgba(42, 69, 102, 0.32);
    --dropzone-start: rgba(25, 32, 43, 0.98);
    --dropzone-end: rgba(15, 20, 28, 0.95);
    --badge-bg: rgba(239, 244, 251, 0.08);
    --badge-text: #d5deea;
    --file-pill-bg: rgba(104, 169, 255, 0.14);
    --file-pill-text: #d9e9ff;
    --danger: #ffb3aa;
    --danger-bg: rgba(255, 128, 116, 0.14);
    --danger-text: #ffd2cc;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: "Manrope", sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at top center, rgba(10, 132, 255, 0.12), transparent 24%),
        linear-gradient(180deg, var(--page-gradient-start) 0%, var(--bg) 55%, var(--page-gradient-end) 100%);
}

.page-shell {
    width: min(1080px, calc(100% - 28px));
    margin: 0 auto;
    padding: 22px 0 56px;
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.topbar-minimal {
    margin-bottom: 14px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 14px;
    text-decoration: none;
    color: inherit;
}

.brand-mark {
    width: 52px;
    height: 52px;
    display: grid;
    place-items: center;
    border-radius: 16px;
    background:
        radial-gradient(circle at top left, rgba(255, 255, 255, 0.22), transparent 42%),
        linear-gradient(145deg, #0f1728, #1d3557 58%, #0a84ff);
    box-shadow: 0 16px 30px rgba(17, 18, 20, 0.18);
}

.brand-mark-svg {
    width: 34px;
    height: 34px;
    overflow: visible;
}

.brand-mark-svg rect,
.brand-mark-svg path,
.brand-mark-svg circle {
    stroke: white;
    stroke-width: 3;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.brand-mark-svg rect {
    fill: rgba(255, 255, 255, 0.08);
}

.brand-mark-svg circle {
    fill: white;
}

.brand strong {
    letter-spacing: -0.03em;
    font-size: 1.22rem;
}

.brand strong,
h1,
.converter-head h2,
.micro-features strong {
    font-family: "Space Grotesk", sans-serif;
}

.brand p,
.topbar-note,
.lead,
.converter-head p,
.dropzone-subtitle,
.upload-meta p,
.micro-features p {
    color: var(--muted);
}

.brand p {
    margin: 3px 0 0;
    font-size: 0.93rem;
}

.topbar-note {
    padding: 10px 14px;
    border-radius: 999px;
    background: var(--topbar-pill);
    border: 1px solid var(--line);
    font-size: 0.9rem;
    font-weight: 700;
}

.topbar-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.theme-toggle {
    width: auto;
    min-height: 40px;
    padding: 0 14px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: var(--topbar-pill);
    color: var(--text);
    box-shadow: none;
    font-size: 0.9rem;
}

.theme-toggle:hover {
    box-shadow: none;
}

.hero-panel {
    padding: 24px;
    border-radius: 34px;
    background: var(--panel);
    border: 1px solid var(--hero-border);
    backdrop-filter: blur(18px);
    box-shadow: var(--shadow);
}

.hero-minimal {
    max-width: 760px;
    margin: 0 auto 18px;
    text-align: center;
}

.eyebrow,
.mini-label,
.dropzone-badge {
    display: inline-flex;
    align-items: center;
    padding: 7px 12px;
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.eyebrow,
.mini-label {
    background: rgba(10, 132, 255, 0.08);
    color: var(--accent-dark);
}

h1 {
    margin: 12px auto 0;
    max-width: 13ch;
    font-size: clamp(2.2rem, 5.8vw, 4.3rem);
    line-height: 0.98;
    letter-spacing: -0.04em;
}

.lead {
    max-width: 42rem;
    margin: 14px auto 0;
    font-size: 1rem;
    line-height: 1.6;
}

.converter-card {
    width: min(760px, 100%);
    margin: 0 auto;
    padding: 24px;
    border-radius: 30px;
    background: var(--panel-strong);
    border: 1px solid var(--line);
    box-shadow: var(--card-shadow);
}

.converter-head {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 16px;
}

.converter-head h2 {
    margin: 12px 0 0;
    font-size: clamp(1.6rem, 4vw, 2.2rem);
    letter-spacing: -0.03em;
}

.converter-head p {
    margin: 0;
    max-width: 18rem;
    text-align: right;
    line-height: 1.6;
}

.upload-form {
    margin-top: 18px;
    display: grid;
    gap: 16px;
}

.format-control {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    padding: 12px 14px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: var(--format-bg);
    font-weight: 800;
}

.format-control select {
    min-width: 160px;
    min-height: 44px;
    padding: 0 38px 0 14px;
    border: 1px solid var(--input-border);
    border-radius: 14px;
    background: var(--input-bg);
    color: var(--text);
    font: inherit;
    font-weight: 800;
}

.dropzone {
    display: grid;
    place-items: center;
    gap: 8px;
    min-height: 240px;
    padding: 28px;
    border: 1.5px dashed rgba(10, 132, 255, 0.28);
    border-radius: 28px;
    background:
        radial-gradient(circle at top, var(--dropzone-glow), transparent 62%),
        linear-gradient(180deg, var(--dropzone-start), var(--dropzone-end));
    text-align: center;
    cursor: pointer;
    transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.dropzone:hover,
.dropzone-active {
    transform: translateY(-2px);
    border-color: rgba(10, 132, 255, 0.55);
    box-shadow: 0 18px 40px rgba(10, 132, 255, 0.08);
}

.dropzone input {
    display: none;
}

.dropzone-title {
    font-size: 1.26rem;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.dropzone-badge {
    margin-top: 4px;
    background: var(--badge-bg);
    color: var(--badge-text);
}

.upload-meta {
    display: grid;
    gap: 10px;
}

.upload-meta p {
    margin: 0;
    font-size: 0.96rem;
    font-weight: 700;
}

.upload-warning {
    color: var(--danger);
}

.file-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.file-pill {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border-radius: 999px;
    background: var(--file-pill-bg);
    color: var(--file-pill-text);
    font-size: 0.92rem;
}

.file-pill strong {
    color: var(--text);
}

.file-pill-accent {
    background: var(--danger-bg);
    color: var(--danger-text);
}

button {
    width: 100%;
    min-height: 58px;
    padding: 0 20px;
    border: 0;
    border-radius: 18px;
    background: linear-gradient(180deg, var(--accent), var(--accent-dark));
    color: white;
    font: inherit;
    font-weight: 800;
    letter-spacing: -0.01em;
    cursor: pointer;
    box-shadow: 0 16px 30px rgba(10, 132, 255, 0.2);
    transition: transform 0.18s ease, box-shadow 0.18s ease, opacity 0.18s ease;
}

button:hover {
    transform: translateY(-1px);
    box-shadow: 0 18px 34px rgba(10, 132, 255, 0.24);
}

button:disabled {
    cursor: not-allowed;
    opacity: 0.6;
    box-shadow: none;
}

.micro-features {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
    width: min(860px, 100%);
    margin: 18px auto 0;
}

.micro-features article {
    padding: 18px 18px 20px;
    border-radius: 24px;
    background: var(--panel);
    border: 1px solid var(--line);
}

.micro-features strong {
    display: block;
    margin-bottom: 8px;
    font-size: 1rem;
}

.micro-features p {
    margin: 0;
    line-height: 1.6;
}

.seo-section {
    width: min(860px, 100%);
    margin: 22px auto 0;
    padding: 6px 4px 0;
}

.seo-section h2 {
    margin: 0;
    font-family: "Space Grotesk", sans-serif;
    font-size: clamp(1.4rem, 3vw, 2rem);
    letter-spacing: -0.03em;
}

.seo-section p {
    margin: 12px 0 0;
    color: var(--muted);
    line-height: 1.7;
}

.error-panel {
    min-height: min(620px, calc(100vh - 120px));
    display: grid;
    place-items: center;
    padding: 24px 0;
}

.error-card {
    width: min(680px, 100%);
    padding: 42px;
    border: 1px solid var(--line);
    border-radius: 30px;
    background: var(--panel-strong);
    box-shadow: var(--card-shadow);
    text-align: center;
}

.page-title {
    max-width: 14ch;
}

.solid-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 52px;
    margin-top: 24px;
    padding: 0 22px;
    border-radius: 16px;
    background: linear-gradient(180deg, var(--accent), var(--accent-dark));
    color: white;
    font-weight: 800;
    text-decoration: none;
    box-shadow: 0 16px 30px rgba(10, 132, 255, 0.18);
}

@media (max-width: 760px) {
    .page-shell {
        width: min(100% - 18px, 100%);
        padding-top: 14px;
    }

    .topbar {
        align-items: flex-start;
        flex-direction: column;
    }

    .topbar-actions {
        width: 100%;
        justify-content: space-between;
    }

    .hero-panel,
    .converter-card,
    .error-card {
        padding: 18px;
        border-radius: 24px;
    }

    .converter-head {
        align-items: flex-start;
        flex-direction: column;
    }

    .converter-head p {
        max-width: none;
        text-align: left;
    }

    .format-control {
        align-items: stretch;
        flex-direction: column;
    }

    .format-control select {
        width: 100%;
    }

    .micro-features {
        grid-template-columns: 1fr;
    }

    h1 {
        font-size: clamp(2.4rem, 12vw, 4rem);
    }
}