* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg: #f4f6ff;
    --ink: #0f172a;
    --text: #334155;
    --muted: #64748b;
    --line: #e2e8f0;
    --card: #ffffff;
    --brand: #5b4df4;
    --brand-dark: #4338ca;
    --brand-soft: #eef2ff;
    --shadow: 0 24px 60px rgba(30, 41, 59, 0.12);
}

body {
    min-height: 100vh;
    display: grid;
    place-items: center;
    background: radial-gradient(circle at 15% 20%, #dbeafe 0%, transparent 45%),
        radial-gradient(circle at 85% 80%, #ede9fe 0%, transparent 40%),
        var(--bg);
    padding: 40px 24px;
    color: var(--text);
    font-family: "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
}

.container {
    width: min(1120px, 100%);
    background: rgba(255, 255, 255, 0.7);
    border: 1px solid rgba(255, 255, 255, 0.9);
    border-radius: 28px;
    padding: 28px;
    display: grid;
    grid-template-columns: minmax(320px, 1.2fr) minmax(320px, 1fr);
    gap: 24px;
    box-shadow: var(--shadow);
    backdrop-filter: blur(8px);
}

.con-box {
    border-radius: 22px;
    background: linear-gradient(160deg, #ffffff 0%, #eef2ff 100%);
    border: 1px solid rgba(91, 77, 244, 0.12);
    padding: 46px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.con-box::after {
    content: "";
    position: absolute;
    width: 220px;
    height: 220px;
    right: -70px;
    top: -70px;
    border-radius: 999px;
    background: radial-gradient(circle at center, rgba(91, 77, 244, 0.2), transparent 70%);
}

.brand-kicker {
    color: var(--brand);
    font-weight: 700;
    letter-spacing: 0.08em;
    font-size: 12px;
    text-transform: uppercase;
}

.con-box h2 {
    font-size: clamp(28px, 4vw, 40px);
    line-height: 1.2;
    color: var(--ink);
    max-width: 16ch;
}

.con-box p {
    font-size: 16px;
    line-height: 1.75;
    color: var(--muted);
    max-width: 38ch;
}

.con-box img {
    width: 160px;
    height: 160px;
    object-fit: contain;
    margin: 12px 0;
}

.brand-points {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.brand-points span {
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(91, 77, 244, 0.1);
    color: var(--brand-dark);
    font-size: 13px;
    font-weight: 600;
}

.form-box {
    border-radius: 22px;
    background: var(--card);
    border: 1px solid var(--line);
    padding: 34px;
    box-shadow: 0 16px 38px rgba(15, 23, 42, 0.08);
}

.auth-tabs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-bottom: 26px;
    padding: 6px;
    border-radius: 12px;
    background: #f8fafc;
    border: 1px solid #e9edf5;
}

.auth-tab {
    border: none;
    background: transparent;
    color: var(--muted);
    padding: 12px;
    border-radius: 10px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.auth-tab.is-active {
    background: #ffffff;
    color: var(--brand-dark);
    box-shadow: 0 8px 20px rgba(67, 56, 202, 0.15);
}

.auth-tab:focus-visible,
.form-box button:focus-visible,
input:focus-visible {
    outline: 3px solid rgba(91, 77, 244, 0.25);
    outline-offset: 1px;
}

.auth-panel {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.hidden {
    display: none;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

h1 {
    font-size: 30px;
    line-height: 1.2;
    color: var(--ink);
}

.panel-subtitle {
    color: var(--muted);
    margin-bottom: 10px;
    font-size: 14px;
}

input {
    width: 100%;
    padding: 13px 14px;
    border-radius: 12px;
    border: 1px solid var(--line);
    background: #fbfdff;
    color: var(--ink);
    font-size: 14px;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input::placeholder {
    color: #94a3b8;
}

input:focus {
    border-color: #a5b4fc;
    box-shadow: 0 0 0 4px rgba(165, 180, 252, 0.3);
    outline: none;
}

.form-box button {
    margin-top: 8px;
    min-height: 44px;
    border: none;
    border-radius: 12px;
    padding: 12px 16px;
    background: linear-gradient(135deg, var(--brand), var(--brand-dark));
    color: #ffffff;
    font-size: 15px;
    font-weight: 700;
    letter-spacing: 0.02em;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.form-box button:hover {
    transform: translateY(-1px);
    box-shadow: 0 14px 24px rgba(67, 56, 202, 0.24);
}

.form-box button:active {
    transform: translateY(0);
}

@media (max-width: 960px) {
    .container {
        grid-template-columns: 1fr;
        padding: 16px;
    }

    .con-box {
        padding: 30px;
    }

    .con-box h2 {
        max-width: none;
    }

    .form-box {
        padding: 24px;
    }
}

@media (max-width: 560px) {
    body {
        padding: 14px;
    }

    .container {
        border-radius: 20px;
        gap: 14px;
    }

    .brand-panel {
        display: none;
    }

    .form-box {
        border-radius: 16px;
        padding: 18px;
    }

    h1 {
        font-size: 24px;
    }

    .auth-tab,
    input,
    .form-box button {
        font-size: 14px;
    }
}