:root {
    --bg: #f4f7ff;
    --card: #ffffff;
    --text: #0f172a;
    --muted: #64748b;
    --line: rgba(2,6,23,.10);
    --primary: #1d4ed8;
    --primary2: #1e40af;
    --shadow: 0 20px 60px rgba(2,6,23,.18);
}

body.dark {
    --bg: #0b1020;
    --card: #0f172a;
    --text: #e8eeff;
    --muted: #9aa7c7;
    --line: rgba(255,255,255,.10);
    --primary: #6ea8fe;
    --primary2: #3b82f6;
    --shadow: 0 24px 70px rgba(0,0,0,.45);
}

.auth {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 24px;
    background: var(--bg);
    position: relative;
}

.auth-bg {
    position: absolute;
    inset: 0;
    background: radial-gradient(900px 400px at 20% 10%, rgba(29,78,216,.18), transparent 60%), radial-gradient(900px 400px at 80% 20%, rgba(29,78,216,.12), transparent 60%), linear-gradient(180deg, rgba(255,255,255,.0), rgba(255,255,255,.0));
    pointer-events: none;
}

.auth-card {
    width: min(520px, 100%);
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: var(--shadow);
    padding: 18px;
    position: relative;
    overflow: hidden; /* ✅ prevents any overflow mess */
}

.auth-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 14px;
}

.brand {
    display: flex;
    gap: 12px;
    align-items: center;
}

.brand-logo {
    width: 46px;
    height: 46px;
    border-radius: 14px;
    background: linear-gradient(180deg, var(--primary), var(--primary2));
    color: white;
    display: grid;
    place-items: center;
    font-weight: 900;
    letter-spacing: .5px;
    box-shadow: 0 12px 28px rgba(29,78,216,.22);
}

.brand-title {
    font-weight: 900;
    font-size: 18px;
    color: var(--text);
    line-height: 1.1;
}

.brand-sub {
    font-size: 12px;
    color: var(--muted);
    margin-top: 2px;
}

.theme-btn {
    border: 1px solid var(--line);
    background: rgba(255,255,255,.60);
    color: var(--text);
    border-radius: 12px;
    padding: 8px 10px;
    cursor: pointer;
    font-weight: 800;
}

body.dark .theme-btn {
    background: rgba(0,0,0,.20);
}

.form {
    margin-top: 10px;
}

.lbl {
    display: block;
    font-size: 13px;
    font-weight: 800;
    color: var(--text);
    margin: 10px 0 6px;
}

.inp {
    width: 100%;
    max-width: 100%;
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 12px 14px;
    background: rgba(255,255,255,.70);
    color: var(--text);
    outline: none;
    font-weight: 700;
}

body.dark .inp {
    background: rgba(0,0,0,.20);
}

.inp:focus {
    border-color: rgba(29,78,216,.55);
    box-shadow: 0 0 0 4px rgba(29,78,216,.12);
}

.otp {
    letter-spacing: 14px;
    text-align: center;
    font-size: 18px;
    font-weight: 900;
    padding-left: 20px; /* balances letter-spacing */
}

.btn-primary {
    width: 100%;
    border: 0;
    margin-top: 14px;
    padding: 12px 14px;
    border-radius: 14px;
    background: linear-gradient(180deg, var(--primary), var(--primary2));
    color: white;
    font-weight: 900;
    cursor: pointer;
    box-shadow: 0 14px 30px rgba(29,78,216,.22);
}

.btn-ghost {
    border: 1px solid var(--line);
    background: transparent;
    color: var(--text);
    border-radius: 12px;
    padding: 10px 12px;
    font-weight: 900;
    cursor: pointer;
}

    .btn-ghost:disabled {
        opacity: .6;
        cursor: not-allowed;
    }

.row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 10px;
    flex-wrap: wrap;
}

.row-between {
    justify-content: space-between;
}

.chk {
    display: flex;
    gap: 8px;
    align-items: center;
    font-weight: 800;
    color: var(--text);
    font-size: 13px;
}

.hint {
    color: var(--muted);
    font-size: 12px;
    font-weight: 700;
}

.alert {
    border-radius: 14px;
    padding: 10px 12px;
    border: 1px solid var(--line);
    margin-top: 8px;
    font-weight: 800;
    font-size: 13px;
}

.alert-info {
    background: rgba(29,78,216,.08);
}

.alert-danger {
    background: rgba(239,68,68,.10);
    border-color: rgba(239,68,68,.25);
}

.foot {
    margin-top: 14px;
    display: flex;
    gap: 8px;
    align-items: center;
    justify-content: center;
    color: var(--muted);
    font-size: 12px;
    font-weight: 700;
}

    .foot a {
        color: var(--primary);
        text-decoration: none;
        font-weight: 900;
    }

.link-muted {
    color: var(--muted) !important;
    text-decoration: none;
    font-weight: 800;
}

.auth-footer {
    margin-top: 14px;
    text-align: center;
    color: var(--muted);
    font-size: 11px;
    font-weight: 700;
}

@media (max-width:520px) {
    .auth-card {
        padding: 14px;
        border-radius: 16px;
    }

    .otp {
        letter-spacing: 10px;
    }
}