:root {
    color-scheme: dark;
    font-family: "Sarabun", "Noto Sans Thai", system-ui, -apple-system, sans-serif;
    --bg: #05050a;
    --surface: rgba(17, 15, 30, 0.92);
    --border: rgba(139, 92, 246, 0.26);
    --accent: #8b5cf6;
    --accent-hi: #a78bfa;
    --text: #f8fafc;
    --muted: #9ca3af;
    --danger: #fb7185;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    min-height: 100vh;
    color: var(--text);
    background:
        radial-gradient(circle at 18% 10%, rgba(124, 58, 237, 0.24), transparent 36rem),
        radial-gradient(circle at 92% 88%, rgba(37, 99, 235, 0.14), transparent 32rem),
        var(--bg);
}

.login-shell {
    min-height: 100vh;
    min-height: 100dvh;
    display: grid;
    place-items: center;
    padding: 24px;
}

.login-card {
    width: min(100%, 480px);
    padding: clamp(24px, 6vw, 42px);
    border: 1px solid var(--border);
    border-radius: 28px;
    background: linear-gradient(145deg, rgba(24, 20, 43, 0.96), var(--surface));
    box-shadow: 0 28px 90px rgba(0, 0, 0, 0.52);
    backdrop-filter: blur(24px);
}

.brand {
    display: flex;
    gap: 18px;
    align-items: center;
    margin-bottom: 34px;
}

.brand img {
    flex: 0 0 auto;
    object-fit: contain;
    border-radius: 18px;
    background: #fff;
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.28);
}

.eyebrow {
    margin: 0 0 5px;
    color: var(--accent-hi);
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 0.12em;
}

h1 {
    margin: 0;
    font-size: clamp(30px, 8vw, 44px);
    line-height: 1;
}

.subtitle {
    margin: 9px 0 0;
    color: var(--muted);
    font-size: 14px;
}

form { display: grid; gap: 10px; }

label {
    margin-top: 8px;
    color: #d8d4e8;
    font-size: 13px;
    font-weight: 700;
}

input {
    width: 100%;
    min-height: 52px;
    padding: 0 16px;
    border: 1px solid rgba(148, 163, 184, 0.2);
    border-radius: 14px;
    outline: none;
    color: var(--text);
    background: rgba(4, 4, 12, 0.74);
    font: inherit;
    font-size: 16px;
    transition: border-color 160ms ease, box-shadow 160ms ease;
}

input:focus {
    border-color: var(--accent-hi);
    box-shadow: 0 0 0 4px rgba(139, 92, 246, 0.17);
}

.password-wrap { position: relative; }
.password-wrap input { padding-right: 74px; }

.text-button {
    position: absolute;
    right: 8px;
    top: 8px;
    min-height: 36px;
    padding: 0 10px;
    border: 0;
    border-radius: 9px;
    color: var(--accent-hi);
    background: transparent;
    font: inherit;
    font-size: 13px;
    font-weight: 800;
    cursor: pointer;
}

.message {
    min-height: 22px;
    margin: 5px 0 0;
    color: var(--danger);
    font-size: 13px;
}

.login-button {
    min-height: 54px;
    border: 0;
    border-radius: 15px;
    color: #fff;
    background: linear-gradient(135deg, #7c3aed, #4f46e5);
    box-shadow: 0 13px 30px rgba(124, 58, 237, 0.28);
    font: inherit;
    font-size: 16px;
    font-weight: 800;
    cursor: pointer;
}

.login-button:disabled {
    cursor: wait;
    opacity: 0.7;
}

.security-note {
    margin: 22px 0 0;
    color: var(--muted);
    font-size: 12px;
    line-height: 1.55;
    text-align: center;
}

@media (max-width: 430px) {
    .login-shell { padding: 14px; }
    .login-card { border-radius: 22px; }
    .brand { align-items: flex-start; }
    .brand img { width: 62px; height: 62px; border-radius: 14px; }
}

@media (prefers-reduced-motion: reduce) {
    * { scroll-behavior: auto !important; transition: none !important; }
}