:root {
    --bg: #f6f7fb;
    --panel: #ffffff;
    --panel-2: #f1f3f9;
    --border: #e2e6ef;
    --text: #16202c;
    --muted: #6b7382;
    --accent: #1f4ed8;
    --ok: #4ec07b;
    --err: #d83838;
    --shadow: 0 4px 24px rgba(15, 23, 42, 0.08);
}
@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0b0d12;
        --panel: #131722;
        --panel-2: #1a1f2e;
        --border: #232a3b;
        --text: #e7ecf3;
        --muted: #8c95a8;
        --accent: #6aa9ff;
        --ok: #4ec07b;
        --err: #ff6c6c;
        --shadow: 0 4px 20px rgba(0, 0, 0, 0.35);
    }
}

* { box-sizing: border-box; }
html, body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font: 14px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
    -webkit-font-smoothing: antialiased;
}

.auth-body {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 24px;
}
.auth {
    width: 100%;
    max-width: 420px;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 32px;
    box-shadow: var(--shadow);
    text-align: center;
}
.auth__brand {
    color: var(--accent);
    font-weight: 700;
    text-decoration: none;
    letter-spacing: 0.01em;
}
.auth__title {
    margin: 14px 0 6px;
    font-size: 24px;
    font-weight: 700;
}
.auth__lead {
    margin: 0 0 22px;
    color: var(--muted);
    font-size: 13px;
}

.auth-flash {
    margin: 0 0 16px;
    padding: 10px 14px;
    border-radius: 8px;
    font-size: 13px;
    text-align: left;
}
.auth-flash--ok  { background: rgba(78, 192, 123, 0.12); color: var(--ok); border: 1px solid rgba(78, 192, 123, 0.4); }
.auth-flash--err { background: rgba(216, 56, 56, 0.10); color: var(--err); border: 1px solid rgba(216, 56, 56, 0.4); }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: var(--panel-2);
    color: var(--text);
    font: inherit;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: filter .15s, border-color .15s;
}
.btn:hover { filter: brightness(1.04); border-color: var(--accent); }
.btn--google { background: #fff; color: #16202c; border-color: #dadce0; }
.btn--google:hover { background: #f6f7fb; }
.btn--primary {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}
.btn--primary:hover { filter: brightness(1.08); }

.auth__or {
    position: relative;
    margin: 18px 0;
    text-align: center;
    color: var(--muted);
    font-size: 11px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}
.auth__or::before,
.auth__or::after {
    content: "";
    position: absolute;
    top: 50%;
    width: calc(50% - 22px);
    height: 1px;
    background: var(--border);
}
.auth__or::before { left: 0; }
.auth__or::after  { right: 0; }
.auth__or span { background: var(--panel); padding: 0 8px; position: relative; }

.auth-form { display: grid; gap: 10px; text-align: left; }
.auth-form__label {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--muted);
}
.auth-form__input {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: var(--panel-2);
    color: var(--text);
    font: inherit;
}
.auth-form__input:focus {
    outline: 2px solid var(--accent);
    outline-offset: 1px;
}
.auth-form__hint { margin: 4px 0 0; color: var(--muted); font-size: 12px; }

.auth__back {
    margin-top: 26px;
    font-size: 13px;
}
.auth__back a {
    color: var(--muted);
    text-decoration: none;
}
.auth__back a:hover { color: var(--accent); }