:root {
    --bg: #101214;
    --panel: #171a1d;
    --elevated: #1f2428;
    --hairline: rgb(255 255 255 / 0.08);
    --text: #e6e8eb;
    --muted: #8d939a;
    --accent: #3d9b8f;
    --accent-dim: #2a6f67;
    --ok: #3d9b8f;
    --warn: #c9a227;
    --danger: #d96b6b;
    --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    min-height: 100%;
    background:
        radial-gradient(1200px 600px at 12% -10%, rgb(61 155 143 / 0.12), transparent 55%),
        var(--bg);
    color: var(--text);
    font: 15px/1.45 ui-sans-serif, system-ui, -apple-system, "SF Pro Text", sans-serif;
}

#root { min-height: 100dvh; }

.app {
    max-width: 880px;
    margin: 0 auto;
    padding: 28px 18px 64px;
}

.header h1 {
    margin: 0;
    font-size: 32px;
    letter-spacing: -0.04em;
    font-weight: 600;
}

.header p {
    margin: 6px 0 22px;
    color: var(--muted);
}

.banner {
    background: rgb(201 162 39 / 0.16);
    color: var(--text);
    border: 1px solid rgb(201 162 39 / 0.35);
    padding: 10px 14px;
    border-radius: 16px;
    margin: 0 0 12px;
    animation: rise 420ms var(--ease);
}
.banner[hidden] { display: none; }

.tabs {
    display: flex;
    flex-wrap: nowrap;
    gap: 8px;
    margin-bottom: 22px;
    overflow-x: auto;
    padding-bottom: 4px;
}

.tab, button, .file-btn {
    appearance: none;
    border: 1px solid var(--hairline);
    background: var(--elevated);
    color: var(--text);
    border-radius: 999px;
    padding: 10px 16px;
    cursor: pointer;
    font: inherit;
    transition: transform 280ms var(--ease), background 280ms var(--ease), color 280ms var(--ease);
}

.tab.active, button.primary {
    background: var(--accent);
    border-color: transparent;
    color: #04110f;
}

button:active, .tab:active { transform: scale(0.98); }

button:disabled, .tab:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

.screen {
    animation: rise 480ms var(--ease);
}

.screen h2 {
    margin: 0 0 6px;
    font-size: 24px;
    letter-spacing: -0.03em;
}

.card {
    background: var(--panel);
    border: 1px solid var(--hairline);
    border-radius: 26px;
    padding: 18px;
    margin-bottom: 14px;
    box-shadow: inset 0 1px 0 rgb(255 255 255 / 0.06);
}

.row {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    align-items: center;
    padding: 8px 0;
}

.row + .row { border-top: 1px solid var(--hairline); }

.label { color: var(--muted); }

.meter {
    height: 12px;
    background: var(--elevated);
    border-radius: 999px;
    overflow: hidden;
}

.meter > span {
    display: block;
    height: 100%;
    width: 0;
    background: var(--ok);
    transition: width 220ms var(--ease);
}

.meter.warn > span { background: var(--warn); }
.meter.clip > span { background: var(--danger); }

input[type="range"] { width: 100%; accent-color: var(--accent); }

input[type="text"], input[type="url"] {
    width: 100%;
    background: var(--elevated);
    border: 1px solid var(--hairline);
    color: var(--text);
    border-radius: 16px;
    padding: 12px 14px;
    font: inherit;
}

.actions { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0; }

.status { color: var(--muted); font-size: 14px; }

.error { color: var(--danger); }

.hidden-file { display: none; }

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

.slider-row {
    display: grid;
    grid-template-columns: 110px 1fr 72px;
    gap: 10px;
    align-items: center;
    margin: 10px 0;
}

@keyframes rise {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 600px) {
    .slider-row { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
    .screen, .banner, .tab, button, .meter > span {
        animation: none;
        transition: none;
    }
}