* { box-sizing: border-box; }

html, body {
    margin: 0;
    min-height: 100%;
}

.auth-page {
    min-height: 100vh;
    min-height: 100dvh;
    font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    color: #1f2937;
    background:
        radial-gradient(120% 80% at 12% -10%, #fff7ed 0%, transparent 52%),
        radial-gradient(90% 70% at 108% 8%, #bfdbfe 0%, transparent 48%),
        radial-gradient(80% 60% at -8% 88%, #bbf7d0 0%, transparent 50%),
        radial-gradient(70% 50% at 92% 100%, #fde68a 0%, transparent 46%),
        linear-gradient(165deg, #dbeafe 0%, #eef6ff 38%, #ecfdf5 72%, #fff7ed 100%);
    position: relative;
    overflow-x: hidden;
}

.scene {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    overflow: hidden;
}

.scene .mesh {
    position: absolute;
    inset: -20%;
    background:
        radial-gradient(circle at 18% 22%, rgba(255, 154, 82, 0.28) 0%, transparent 32%),
        radial-gradient(circle at 82% 18%, rgba(96, 165, 250, 0.38) 0%, transparent 36%),
        radial-gradient(circle at 12% 78%, rgba(52, 211, 153, 0.28) 0%, transparent 34%),
        radial-gradient(circle at 78% 82%, rgba(251, 191, 36, 0.26) 0%, transparent 32%);
    filter: blur(2px);
}

.scene .orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(2px);
}

.scene .orb-a {
    width: min(78vw, 460px);
    height: min(78vw, 460px);
    right: -22vw;
    top: -16vw;
    background: radial-gradient(circle at 35% 35%, #7dd3fc, rgba(125, 211, 252, 0));
    opacity: 0.85;
}

.scene .orb-b {
    width: min(88vw, 520px);
    height: min(88vw, 520px);
    left: -28vw;
    bottom: -22vw;
    background: radial-gradient(circle at 60% 40%, #6ee7b7, rgba(110, 231, 183, 0));
    opacity: 0.8;
}

.scene .orb-c {
    width: min(52vw, 280px);
    height: min(52vw, 280px);
    left: 42%;
    top: 8%;
    background: radial-gradient(circle at 40% 40%, #fdba74, rgba(253, 186, 116, 0));
    opacity: 0.55;
}

.scene .orb-d {
    width: min(40vw, 220px);
    height: min(40vw, 220px);
    right: 8%;
    bottom: 12%;
    background: radial-gradient(circle at 40% 40%, #fde68a, rgba(253, 230, 138, 0));
    opacity: 0.7;
}

.scene .sparkle {
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle, rgba(255,255,255,0.7) 1px, transparent 1.6px),
        radial-gradient(circle, rgba(255,255,255,0.45) 1px, transparent 1.6px);
    background-size: 92px 92px, 64px 64px;
    background-position: 0 0, 28px 40px;
    opacity: 0.35;
}

.auth-wrap {
    position: relative;
    z-index: 1;
    width: min(94vw, 420px);
    margin: 0 auto;
    padding: calc(24px + env(safe-area-inset-top)) 0 calc(36px + env(safe-area-inset-bottom));
}

.brand {
    text-align: center;
    margin-bottom: 22px;
}

.logo {
    width: 72px;
    height: 72px;
    margin: 0 auto 14px;
    border-radius: 22px;
    background: linear-gradient(180deg, #ff9a4d, #f97316);
    color: #fff;
    font: 700 38px/72px Georgia, "Times New Roman", serif;
    box-shadow: 0 14px 28px rgba(249, 115, 22, 0.32);
}

.brand h1 {
    margin: 0;
    font-size: 30px;
    letter-spacing: 0.14em;
}

.brand p {
    margin: 8px 0 0;
    color: #64748b;
    font-size: 15px;
}

.auth-card {
    background: rgba(255, 255, 255, 0.86);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border: 1px solid rgba(255, 255, 255, 0.7);
    border-radius: 28px;
    padding: 20px 18px 24px;
    box-shadow: 0 22px 50px rgba(15, 23, 42, 0.1);
}

.tabs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    background: #e8eef6;
    border-radius: 999px;
    padding: 5px;
    margin-bottom: 18px;
}

.tab {
    border: 0;
    min-height: 48px;
    border-radius: 999px;
    background: transparent;
    color: #64748b;
    font-size: 17px;
    font-weight: 600;
    cursor: pointer;
}

.tab.active {
    color: #fff;
    background: linear-gradient(90deg, #60a5fa, #2563eb);
    box-shadow: 0 8px 18px rgba(37, 99, 235, 0.32);
}

.alert {
    margin: 0 0 12px;
    padding: 12px 14px;
    border-radius: 14px;
    font-size: 14px;
}

.alert.error { background: #fef2f2; color: #b91c1c; }
.alert.ok { background: #ecfdf5; color: #047857; }

.auth-notice {
    display: flex;
    gap: 12px;
    align-items: flex-start;
    margin-bottom: 16px;
    padding: 16px 14px;
    border-radius: 16px;
}

.auth-notice-danger {
    background: linear-gradient(180deg, #fff1f2 0%, #fef2f2 100%);
    border: 2px solid #f87171;
    box-shadow: 0 10px 24px rgba(220, 38, 38, 0.14);
}

.auth-notice-icon {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: #dc2626;
    color: #fff;
    font-size: 18px;
    font-weight: 800;
    line-height: 30px;
    text-align: center;
    flex-shrink: 0;
}

.auth-notice strong {
    display: block;
    margin-bottom: 6px;
    font-size: 18px;
    font-weight: 800;
    color: #991b1b;
}

.auth-notice p {
    margin: 0;
    font-size: 15px;
    line-height: 1.55;
    color: #b91c1c;
    font-weight: 600;
}

.hint {
    display: none;
    margin: -4px 2px 0;
    color: #dc2626;
    font-size: 14px;
}
.hint.show { display: block; }

.auth-form { display: grid; gap: 14px; }
.auth-form.is-hidden { display: none; }

.field {
    position: relative;
    display: block;
}

.field input {
    width: 100%;
    height: 56px;
    padding: 0 48px 0 50px;
    border: 0;
    border-radius: 16px;
    background: #eef3f8;
    font-size: 17px;
    color: #111827;
}

.field input:focus {
    outline: 2px solid rgba(37, 99, 235, 0.35);
    background: #fff;
}

.ico, .eye {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    color: #94a3b8;
}

.ico { left: 16px; display: flex; }

.ico svg,
.eye svg {
    width: 22px;
    height: 22px;
}

.eye {
    right: 6px;
    width: 48px;
    height: 48px;
    border: 0;
    background: transparent;
    color: #94a3b8;
}

.row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 15px;
}

.row a, .agree a {
    color: #2563eb;
    text-decoration: none;
}

.check {
    display: flex;
    gap: 10px;
    align-items: flex-start;
    font-size: 15px;
    line-height: 1.45;
    color: #4b5563;
}

.check input {
    width: 20px;
    height: 20px;
    margin: 1px 0 0;
    flex: 0 0 20px;
    accent-color: #2563eb;
}

.submit {
    display: block;
    width: 100%;
    min-height: 56px;
    border: 0;
    border-radius: 16px;
    color: #fff;
    font-size: 18px;
    font-weight: 700;
    letter-spacing: 0.28em;
    background: linear-gradient(90deg, #7dd3fc, #3b82f6 55%, #2563eb);
    box-shadow: 0 12px 24px rgba(37, 99, 235, 0.28);
    cursor: pointer;
}

.submit:disabled {
    opacity: 0.45;
    box-shadow: none;
}

.skip {
    display: block;
    margin: 24px auto 0;
    width: max-content;
    padding: 10px 16px;
    color: #334155;
    font-size: 16px;
    text-decoration: none;
    background: rgba(255,255,255,0.45);
    border-radius: 999px;
}

@media (max-width: 480px) {
    .tab { min-height: 52px; font-size: 18px; }
    .field input { height: 58px; font-size: 17px; }
    .submit { min-height: 58px; font-size: 19px; }
}

@media (min-width: 768px) {
    .auth-wrap { padding-top: 72px; }
    .auth-card { padding: 26px 28px 30px; }
}