:root {
    --bg: #08111f;
    --panel: rgba(17, 28, 46, 0.92);
    --panel-2: #101b2d;
    --border: rgba(255,255,255,.10);
    --text: #f8fafc;
    --muted: #96a3b8;
    --accent: #40c4ff;
    --accent-2: #6c63ff;
    --success: #34d399;
    --danger: #fb7185;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: Inter, Segoe UI, Arial, sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at 10% 10%, rgba(64,196,255,.18), transparent 32%),
        radial-gradient(circle at 90% 90%, rgba(108,99,255,.16), transparent 30%),
        linear-gradient(135deg, #07101c, #0a1424 55%, #07101c);
}

a {
    color: inherit;
}

.page-shell {
    width: min(1100px, calc(100% - 32px));
    margin: 0 auto;
    padding: 36px 0 60px;
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    margin-bottom: 24px;
}

.topbar h1,
.login-card h1 {
    margin: 4px 0 0;
    font-size: clamp(28px, 4vw, 44px);
    letter-spacing: -1.2px;
}

.eyebrow {
    color: var(--accent);
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 1.8px;
}

.logout-btn {
    padding: 11px 16px;
    border-radius: 12px;
    text-decoration: none;
    border: 1px solid var(--border);
    background: rgba(255,255,255,.05);
}

.converter-card,
.login-card {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 26px;
    box-shadow: 0 30px 80px rgba(0,0,0,.38);
    backdrop-filter: blur(18px);
}

.converter-card {
    padding: 24px;
}

.intro {
    display: flex;
    gap: 16px;
    align-items: center;
    margin-bottom: 22px;
}

.intro h2 {
    margin: 0 0 6px;
}

.intro p,
.login-card p {
    margin: 0;
    color: var(--muted);
}

.icon-box,
.login-logo {
    display: grid;
    place-items: center;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    box-shadow: 0 14px 30px rgba(64,196,255,.18);
}

.icon-box {
    width: 58px;
    height: 58px;
    border-radius: 17px;
    font-size: 26px;
    flex: 0 0 auto;
}

.drop-zone {
    min-height: 250px;
    border: 2px dashed rgba(64,196,255,.45);
    border-radius: 22px;
    background: rgba(7,16,28,.42);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    text-align: center;
    cursor: pointer;
    transition: .2s ease;
    padding: 28px;
}

.drop-zone:hover {
    transform: translateY(-2px);
    border-color: var(--accent);
    background: rgba(64,196,255,.07);
}

.drop-zone input {
    display: none;
}

.drop-icon {
    font-size: 46px;
}

.drop-zone strong {
    font-size: 21px;
}

.drop-zone small,
.selected-file {
    color: var(--muted);
}

.selected-file {
    margin-top: 8px;
    font-size: 14px;
}

.quality-row {
    margin: 18px 0;
    padding: 16px;
    border-radius: 16px;
    background: var(--panel-2);
    border: 1px solid var(--border);
}

.quality-row > div {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
}

.quality-row input {
    width: 100%;
    accent-color: var(--accent);
}

.primary-btn {
    width: 100%;
    border: 0;
    border-radius: 14px;
    padding: 15px 18px;
    color: white;
    font-size: 16px;
    font-weight: 800;
    cursor: pointer;
    background: linear-gradient(135deg, #1fb6ff, var(--accent-2));
    box-shadow: 0 12px 26px rgba(64,196,255,.18);
}

.alert {
    margin: 16px 0;
    padding: 13px 15px;
    border-radius: 13px;
    border: 1px solid;
}

.alert.success {
    color: #bbf7d0;
    background: rgba(52,211,153,.10);
    border-color: rgba(52,211,153,.30);
}

.alert.error {
    color: #fecdd3;
    background: rgba(251,113,133,.10);
    border-color: rgba(251,113,133,.30);
}

.results {
    margin-top: 28px;
}

.result-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
    gap: 16px;
}

.result-card {
    overflow: hidden;
    border-radius: 17px;
    background: var(--panel-2);
    border: 1px solid var(--border);
}

.result-card img {
    display: block;
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: contain;
    background: white;
}

.result-card a {
    display: block;
    margin: 12px;
    padding: 11px;
    text-align: center;
    border-radius: 11px;
    text-decoration: none;
    font-weight: 800;
    background: rgba(64,196,255,.13);
    border: 1px solid rgba(64,196,255,.26);
}

.login-body {
    display: grid;
    place-items: center;
    padding: 24px;
}

.login-card {
    width: min(430px, 100%);
    padding: 28px;
}

.login-logo {
    width: 62px;
    height: 62px;
    border-radius: 18px;
    margin-bottom: 18px;
    font-weight: 900;
    font-size: 22px;
}

.login-form {
    margin-top: 24px;
}

.login-form label {
    display: block;
    margin-bottom: 16px;
    color: var(--muted);
    font-weight: 700;
}

.login-form input {
    width: 100%;
    margin-top: 8px;
    padding: 14px;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: #0a1424;
    color: var(--text);
    outline: none;
}

.login-form input:focus {
    border-color: var(--accent);
}

.login-hint {
    margin-top: 18px;
    padding: 13px;
    border-radius: 12px;
    color: var(--muted);
    font-size: 13px;
    background: rgba(255,255,255,.04);
}

@media (max-width: 650px) {
    .topbar {
        align-items: flex-start;
    }

    .converter-card {
        padding: 16px;
    }

    .intro {
        align-items: flex-start;
    }
}