:root {
    --drebin-background: #0D1517;
    --drebin-gradient-top: #203942;
    --drebin-gradient-bottom: #333D3D;
    --drebin-surface: rgba(34, 48, 51, 0.88);
    --drebin-surface-strong: rgba(44, 59, 63, 0.92);
    --drebin-field: rgba(13, 21, 23, 0.72);
    --drebin-stroke: rgba(139, 154, 157, 0.42);
    --drebin-stroke-strong: rgba(168, 200, 212, 0.58);
    --drebin-text: #EDF5F6;
    --drebin-muted: #C4D1D3;
    --drebin-muted-soft: #8B9A9D;
    --drebin-accent: #A8C8D4;
    --drebin-on-accent: #0B2932;
    --drebin-error: #FFB4A9;
}

html,
body {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    overflow: hidden;
    background: var(--drebin-background);
    color: var(--drebin-text);
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    letter-spacing: 0;
}

body {
    background:
        radial-gradient(circle at 14% 8%, rgba(168, 200, 212, 0.20), transparent 28rem),
        linear-gradient(180deg, var(--drebin-gradient-top) 0%, var(--drebin-gradient-bottom) 100%);
}

canvas {
    background: var(--drebin-background);
    display: block;
}

.compose-root {
    width: 100%;
    height: 100%;
}

button,
input {
    font: inherit;
    letter-spacing: 0;
}

button {
    cursor: pointer;
}

button:disabled,
input:disabled {
    cursor: progress;
}

body.drebin-auth-active .compose-root {
    opacity: 0;
    pointer-events: none;
}

.auth-screen[hidden] {
    display: none !important;
}

.auth-screen {
    position: fixed;
    inset: 0;
    z-index: 20;
    display: grid;
    place-items: center;
    overflow: auto;
    box-sizing: border-box;
    padding: 24px;
    background:
        radial-gradient(circle at 20% 12%, rgba(237, 245, 246, 0.14), transparent 26rem),
        radial-gradient(circle at 86% 86%, rgba(168, 200, 212, 0.16), transparent 24rem),
        linear-gradient(180deg, var(--drebin-gradient-top) 0%, var(--drebin-gradient-bottom) 100%);
}

.auth-shell {
    width: min(100%, 444px);
    box-sizing: border-box;
    padding: 32px;
    border: 1px solid var(--drebin-stroke);
    border-radius: 28px;
    background: var(--drebin-surface);
    box-shadow: 0 28px 90px rgba(0, 0, 0, 0.34);
    backdrop-filter: blur(18px);
}

.auth-back {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    min-height: 40px;
    box-sizing: border-box;
    margin-bottom: 22px;
    padding: 0 14px;
    border: 1px solid var(--drebin-stroke);
    border-radius: 999px;
    background: rgba(13, 21, 23, 0.42);
    color: var(--drebin-muted);
    font-size: 0.9rem;
    font-weight: 800;
    text-decoration: none;
    transition: border-color 150ms ease, background-color 150ms ease, color 150ms ease;
}

.auth-back:hover,
.auth-back:focus-visible {
    border-color: var(--drebin-stroke-strong);
    background: var(--drebin-surface-strong);
    color: var(--drebin-text);
}

.auth-brand {
    display: flex;
    align-items: center;
    gap: 16px;
}

.auth-logo {
    display: block;
    width: 56px;
    height: 56px;
    flex: 0 0 56px;
    border-radius: 18px;
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.24);
}

.auth-product {
    margin-bottom: 3px;
    color: var(--drebin-accent);
    font-size: 0.92rem;
    font-weight: 800;
    letter-spacing: 0.02em;
}

.auth-brand h1 {
    margin: 0;
    color: var(--drebin-text);
    font-size: clamp(1.86rem, 5vw, 2.18rem);
    line-height: 1.06;
    font-weight: 820;
}

.auth-copy {
    margin: 20px 0 26px;
    color: var(--drebin-muted);
    font-size: 1rem;
    line-height: 1.52;
}

.auth-form {
    display: grid;
    gap: 14px;
}

.auth-field {
    display: grid;
    gap: 8px;
    color: var(--drebin-muted);
    font-size: 0.9rem;
    font-weight: 700;
}

.auth-field input {
    width: 100%;
    min-height: 52px;
    box-sizing: border-box;
    border: 1px solid var(--drebin-stroke);
    border-radius: 16px;
    padding: 0 14px;
    background: var(--drebin-field);
    color: var(--drebin-text);
    outline: none;
    transition: border-color 150ms ease, box-shadow 150ms ease, background-color 150ms ease;
}

.auth-field input:focus {
    border-color: var(--drebin-accent);
    background: rgba(13, 21, 23, 0.84);
    box-shadow: 0 0 0 4px rgba(168, 200, 212, 0.18);
}

.auth-field input:disabled {
    opacity: 0.74;
}

.auth-primary,
.auth-google {
    width: 100%;
    min-height: 50px;
    box-sizing: border-box;
    border-radius: 18px;
    font-weight: 800;
    transition: transform 150ms ease, border-color 150ms ease, background-color 150ms ease, opacity 150ms ease;
}

.auth-primary {
    margin-top: 4px;
    border: 1px solid var(--drebin-accent);
    background: var(--drebin-accent);
    color: var(--drebin-on-accent);
    box-shadow: 0 12px 26px rgba(0, 0, 0, 0.22);
}

.auth-primary:hover:not(:disabled),
.auth-google:hover:not(:disabled) {
    transform: translateY(-1px);
}

.auth-primary:disabled {
    opacity: 0.72;
}

.auth-forgot {
    width: 100%;
    min-height: 36px;
    margin-top: 10px;
    border: 0;
    background: transparent;
    color: var(--drebin-accent);
    font-weight: 800;
}

.auth-forgot:disabled {
    opacity: 0.72;
}

.auth-divider {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 22px 0;
    color: var(--drebin-muted-soft);
    font-size: 0.82rem;
    font-weight: 800;
    text-transform: uppercase;
}

.auth-divider::before,
.auth-divider::after {
    content: "";
    height: 1px;
    flex: 1;
    background: var(--drebin-stroke);
}

.auth-google {
    border: 1px solid var(--drebin-stroke);
    background: var(--drebin-surface-strong);
    color: var(--drebin-text);
}

.auth-google:hover:not(:disabled) {
    border-color: var(--drebin-stroke-strong);
}

.auth-google:disabled {
    opacity: 0.72;
}

.auth-toggle {
    width: 100%;
    min-height: 42px;
    margin-top: 12px;
    border: 0;
    background: transparent;
    color: var(--drebin-accent);
    font-weight: 800;
}

.auth-toggle:disabled {
    opacity: 0.72;
}

.auth-error {
    min-height: 18px;
    margin: 12px 0 0;
    color: var(--drebin-error);
    font-size: 0.88rem;
    line-height: 1.35;
    text-align: center;
}

.auth-error:empty {
    display: none;
}

.auth-message {
    position: fixed;
    left: 50%;
    bottom: max(24px, env(safe-area-inset-bottom));
    z-index: 30;
    width: max-content;
    max-width: min(560px, calc(100vw - 32px));
    box-sizing: border-box;
    margin: 0;
    padding: 14px 18px;
    border: 1px solid var(--drebin-stroke-strong);
    border-radius: 14px;
    background: var(--drebin-surface-strong);
    box-shadow: 0 14px 40px rgba(0, 0, 0, 0.38);
    color: var(--drebin-text);
    font-size: 0.9rem;
    font-weight: 650;
    line-height: 1.4;
    text-align: left;
    opacity: 0;
    pointer-events: none;
    transform: translate(-50%, 16px);
    transition: opacity 180ms ease, transform 180ms ease;
}

.auth-message:empty {
    display: none;
}

.auth-message.is-visible {
    opacity: 1;
    transform: translate(-50%, 0);
}

.auth-legal {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    margin-top: 18px;
    color: var(--drebin-muted-soft);
    font-size: 0.84rem;
}

.auth-legal a {
    color: var(--drebin-muted);
    text-decoration: none;
}

.auth-legal a:hover,
.auth-legal a:focus {
    color: var(--drebin-accent);
    text-decoration: underline;
}

@media (max-width: 520px) {
    .auth-screen {
        align-items: stretch;
        padding: 16px;
    }

    .auth-shell {
        width: 100%;
        min-height: calc(100vh - 32px);
        display: flex;
        flex-direction: column;
        justify-content: center;
        padding: 24px;
        border-radius: 24px;
    }
}