:root {
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-on-primary: #ffffff;
    --color-secondary: #3b82f6;
    --color-accent: #d97706;
    --color-background: #f8fafc;
    --color-foreground: #0f172a;
    --color-muted: #f1f5fd;
    --color-muted-text: #475569;
    --color-border: #e4ecfc;
    --color-destructive: #dc2626;
    --color-success: #047857;
    --color-ring: #2563eb;
    --shadow: 0 1px 2px rgba(15, 23, 42, 0.06), 0 12px 32px rgba(37, 99, 235, 0.06);
    --radius: 16px;
    --font-display: "Poppins", "Segoe UI", sans-serif;
    --font-body: "Open Sans", "Segoe UI", sans-serif;
    --space: 8px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --color-background: #0b1220;
        --color-foreground: #e8eefc;
        --color-muted: #151e32;
        --color-muted-text: #94a3b8;
        --color-border: #243044;
        --color-on-primary: #ffffff;
        --shadow: 0 1px 2px rgba(0, 0, 0, 0.35), 0 16px 40px rgba(0, 0, 0, 0.28);
    }
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    font-size: 16px;
}

body {
    margin: 0;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    color: var(--color-foreground);
    background:
        radial-gradient(1200px 400px at 10% -10%, rgba(37, 99, 235, 0.08), transparent 50%),
        radial-gradient(800px 300px at 100% 0%, rgba(217, 119, 6, 0.08), transparent 45%),
        var(--color-background);
    font-family: var(--font-body);
    line-height: 1.55;
}

img,
svg {
    display: block;
}

a {
    color: var(--color-primary);
}

.skip-link {
    position: absolute;
    left: 12px;
    top: -40px;
    background: var(--color-foreground);
    color: var(--color-background);
    padding: 8px 12px;
    z-index: 100;
}

.skip-link:focus {
    top: 12px;
}

.wrap {
    width: min(760px, calc(100% - 32px));
    margin-inline: auto;
}

.site-header {
    border-bottom: 1px solid var(--color-border);
    background: var(--color-background);
    background: color-mix(in srgb, var(--color-background) 88%, transparent);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 10;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 64px;
    gap: 16px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: inherit;
}

.brand-mark {
    color: var(--color-primary);
}

.brand-text {
    font-family: var(--font-display);
    font-weight: 650;
    letter-spacing: -0.02em;
}

.nav {
    display: flex;
    gap: 8px;
}

.nav a {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    padding: 0 14px;
    border-radius: 999px;
    text-decoration: none;
    color: var(--color-muted-text);
    font-weight: 600;
}

.nav a:hover,
.nav a.is-active {
    color: var(--color-foreground);
    background: var(--color-muted);
}

.nav a:focus-visible,
.btn:focus-visible,
.dropzone:focus-within,
input:focus-visible {
    outline: 3px solid color-mix(in srgb, var(--color-ring) 55%, transparent);
    outline-offset: 2px;
}

main {
    flex: 1;
    padding: 40px 0 72px;
}

.hero h1,
.panel h1,
.panel h2 {
    font-family: var(--font-display);
    letter-spacing: -0.03em;
    line-height: 1.15;
    margin: 0 0 12px;
}

.hero h1 {
    font-size: clamp(1.8rem, 4vw, 2.6rem);
}

.eyebrow {
    margin: 0 0 8px;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--color-accent);
}

.lede {
    margin: 0 0 28px;
    color: var(--color-muted-text);
    max-width: 42rem;
}

.panel {
    background: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 24px;
}

.panel-narrow {
    max-width: 420px;
    margin-inline: auto;
}

.panel-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 16px;
}

.dropzone {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 240px;
    padding: 32px 20px;
    border: 1.5px dashed var(--color-border);
    border-radius: 12px;
    background: var(--color-muted);
    cursor: pointer;
    text-align: center;
    transition: border-color 200ms ease, background 200ms ease, transform 150ms ease;
}

.dropzone:hover,
.dropzone.is-dragover {
    border-color: var(--color-primary);
    background: color-mix(in srgb, var(--color-primary) 8%, var(--color-muted));
}

.dropzone-icon {
    color: var(--color-primary);
}

.dropzone-title {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1.15rem;
}

.dropzone-hint {
    color: var(--color-muted-text);
}

.linkish {
    color: var(--color-primary);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.file-card,
.file-row,
.empty {
    margin-top: 16px;
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 16px;
    background: var(--color-muted);
}

.file-card-row,
.file-row,
.row-actions,
.actions,
.progress-label {
    display: flex;
    align-items: center;
    gap: 12px;
}

.file-row {
    justify-content: space-between;
    list-style: none;
}

.file-list {
    margin: 0;
    padding: 0;
    display: grid;
    gap: 10px;
}

.file-meta {
    min-width: 0;
    flex: 1;
}

.file-name,
.file-size {
    margin: 0;
}

.file-name {
    font-weight: 650;
    word-break: break-word;
}

.file-size {
    color: var(--color-muted-text);
    font-size: 0.925rem;
    font-variant-numeric: tabular-nums;
}

.file-icon {
    color: var(--color-accent);
    flex-shrink: 0;
}

.progress-block {
    margin-top: 16px;
}

.progress-label {
    justify-content: space-between;
    font-size: 0.9rem;
    margin-bottom: 8px;
    color: var(--color-muted-text);
}

.progress {
    height: 10px;
    border-radius: 999px;
    background: color-mix(in srgb, var(--color-border) 80%, var(--color-muted));
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    width: 0;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    transition: width 180ms ease;
}

.actions {
    margin-top: 16px;
}

.btn {
    min-height: 44px;
    padding: 0 16px;
    border: 1px solid transparent;
    border-radius: 10px;
    font: inherit;
    font-weight: 650;
    cursor: pointer;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: background 180ms ease, color 180ms ease, border-color 180ms ease, transform 120ms ease;
}

.btn:active {
    transform: scale(0.98);
}

.btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    transform: none;
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-on-primary);
}

.btn-primary:hover:not(:disabled) {
    background: var(--color-primary-hover);
}

.btn-secondary {
    background: var(--color-background);
    color: var(--color-foreground);
    border-color: var(--color-border);
}

.btn-ghost {
    background: transparent;
    color: var(--color-muted-text);
}

.btn-danger {
    background: transparent;
    color: var(--color-destructive);
    border-color: color-mix(in srgb, var(--color-destructive) 30%, var(--color-border));
}

.feedback {
    margin-top: 16px;
    padding: 12px 14px;
    border-radius: 10px;
    font-weight: 600;
}

.feedback.is-error {
    color: var(--color-destructive);
    background: color-mix(in srgb, var(--color-destructive) 10%, var(--color-background));
}

.feedback.is-success {
    color: var(--color-success);
    background: color-mix(in srgb, var(--color-success) 10%, var(--color-background));
}

.login-form {
    display: grid;
    gap: 8px;
}

.login-form input {
    min-height: 44px;
    border: 1px solid var(--color-border);
    border-radius: 10px;
    padding: 0 12px;
    font: inherit;
    background: var(--color-background);
    color: inherit;
}

.form-error {
    color: var(--color-destructive);
    margin: 0;
}

.empty {
    text-align: center;
}

.site-footer {
    border-top: 1px solid var(--color-border);
    padding: 20px 0 28px;
    color: var(--color-muted-text);
    font-size: 0.9rem;
}

.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;
}

@media (max-width: 640px) {
    .file-row,
    .panel-head,
    .file-card-row {
        flex-direction: column;
        align-items: stretch;
    }

    .row-actions,
    .actions {
        flex-wrap: wrap;
    }

    .btn {
        width: 100%;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation: none !important;
        transition: none !important;
    }
}