:root {
    color-scheme: light;
    --canvas: #f3f6f5;
    --surface: #ffffff;
    --surface-soft: #f7faf9;
    --ink: #17211e;
    --ink-soft: #45534f;
    --muted: #65736f;
    --line: #d8e0dd;
    --line-strong: #aebbb7;
    --primary: #0f766e;
    --primary-strong: #0b5f59;
    --focus: rgba(15, 118, 110, 0.24);
    --danger: #b42318;
    --danger-bg: #fff4f2;
    --warning: #8a4b08;
    --warning-bg: #fff8e8;
    --success: #087443;
    --success-bg: #ecfdf3;
    --shadow: 0 22px 64px rgba(20, 38, 32, 0.12);
}

* {
    box-sizing: border-box;
}

[hidden] {
    display: none !important;
}

html {
    min-width: 320px;
    background: var(--canvas);
}

body {
    min-height: 100vh;
    min-height: 100dvh;
    margin: 0;
    color: var(--ink);
    background:
        radial-gradient(circle at 15% 12%, rgba(15, 118, 110, 0.11), transparent 30rem),
        radial-gradient(circle at 86% 92%, rgba(37, 99, 235, 0.07), transparent 28rem),
        linear-gradient(180deg, #fbfdfc 0%, var(--canvas) 100%);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans KR", sans-serif;
    line-height: 1.5;
    text-rendering: optimizeLegibility;
}

a {
    color: var(--primary-strong);
    text-underline-offset: 0.18em;
}

a:hover {
    text-decoration-thickness: 2px;
}

button,
input {
    font: inherit;
}

.skip-link {
    position: fixed;
    top: 0.75rem;
    left: 0.75rem;
    z-index: 10;
    padding: 0.65rem 0.9rem;
    border-radius: 0.55rem;
    color: #fff;
    background: var(--ink);
    transform: translateY(-180%);
    transition: transform 140ms ease;
}

.skip-link:focus {
    transform: translateY(0);
}

.auth-layout {
    min-height: 100vh;
    min-height: 100dvh;
    display: grid;
    place-items: center;
    padding: clamp(1rem, 4vw, 3rem);
}

.auth-card {
    width: min(100%, 31rem);
    overflow: hidden;
    border: 1px solid rgba(174, 187, 183, 0.78);
    border-radius: 1rem;
    background: var(--surface);
    box-shadow: var(--shadow);
}

.auth-card-wide {
    width: min(100%, 42rem);
}

.auth-header {
    padding: clamp(1.5rem, 5vw, 2.35rem);
    padding-bottom: 1.35rem;
    border-bottom: 1px solid var(--line);
    background: linear-gradient(145deg, #fbfffd 0%, #f2faf7 100%);
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 0.65rem;
    margin-bottom: 1.8rem;
    color: var(--ink);
    font-weight: 800;
    text-decoration: none;
}

.brand-mark {
    width: 2.25rem;
    height: 2.25rem;
    display: inline-grid;
    place-items: center;
    border-radius: 0.65rem;
    color: #c9fff4;
    background: #10201c;
    font-size: 0.72rem;
    letter-spacing: 0.04em;
}

.eyebrow {
    margin: 0 0 0.35rem;
    color: var(--primary);
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.13em;
}

h1 {
    margin: 0;
    font-size: clamp(1.65rem, 5vw, 2.15rem);
    line-height: 1.2;
    letter-spacing: -0.035em;
}

.auth-lead {
    max-width: 37rem;
    margin: 0.85rem 0 0;
    color: var(--ink-soft);
    font-size: 0.96rem;
}

.auth-body {
    padding: clamp(1.5rem, 5vw, 2.35rem);
}

.state-panel {
    min-height: 8rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    color: var(--ink-soft);
    text-align: center;
}

.spinner {
    width: 1.1rem;
    height: 1.1rem;
    flex: 0 0 auto;
    border: 2px solid rgba(15, 118, 110, 0.2);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 720ms linear infinite;
}

.spinner-button {
    width: 0.92rem;
    height: 0.92rem;
    border-color: rgba(255, 255, 255, 0.42);
    border-top-color: #fff;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.form-copy {
    margin: 0 0 1.35rem;
    color: var(--ink-soft);
}

.field {
    margin-bottom: 1.2rem;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 1rem;
}

label,
legend {
    color: var(--ink);
    font-size: 0.9rem;
    font-weight: 750;
}

input[type="email"],
input[type="text"],
input[type="password"] {
    width: 100%;
    min-height: 2.85rem;
    margin-top: 0.42rem;
    padding: 0.7rem 0.78rem;
    border: 1px solid var(--line-strong);
    border-radius: 0.62rem;
    color: var(--ink);
    background: #fff;
    outline: none;
    transition: border-color 120ms ease, box-shadow 120ms ease;
}

input:hover {
    border-color: #84948f;
}

input:focus-visible {
    border-color: var(--primary);
    box-shadow: 0 0 0 0.25rem var(--focus);
}

input[aria-invalid="true"] {
    border-color: var(--danger);
}

.field-help,
.privacy-copy {
    margin: 0.42rem 0 0;
    color: var(--muted);
    font-size: 0.78rem;
}

.password-feedback.is-valid {
    color: var(--success);
}

.password-feedback.is-invalid {
    color: var(--danger);
}

.consent-group {
    margin: 0.35rem 0 1.4rem;
    padding: 1rem;
    border: 1px solid var(--line);
    border-radius: 0.75rem;
    background: var(--surface-soft);
}

.consent-group legend {
    padding: 0 0.35rem;
}

.check-row {
    display: flex;
    align-items: flex-start;
    gap: 0.65rem;
    margin-top: 0.85rem;
    color: var(--ink-soft);
    font-size: 0.84rem;
    font-weight: 500;
}

.check-row input {
    width: 1.05rem;
    height: 1.05rem;
    flex: 0 0 auto;
    margin: 0.14rem 0 0;
    accent-color: var(--primary);
}

.required-label {
    color: var(--danger);
    font-size: 0.76rem;
    font-weight: 750;
}

.button {
    min-height: 2.75rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.66rem 1rem;
    border: 1px solid transparent;
    border-radius: 0.62rem;
    cursor: pointer;
    font-weight: 750;
    text-align: center;
    text-decoration: none;
    transition: background 120ms ease, border-color 120ms ease, transform 120ms ease;
}

.button:hover:not(:disabled) {
    transform: translateY(-1px);
}

.button:focus-visible,
a:focus-visible,
input[type="checkbox"]:focus-visible {
    outline: 3px solid var(--focus);
    outline-offset: 2px;
}

.button:disabled {
    cursor: not-allowed;
    opacity: 0.62;
}

.button-primary {
    color: #fff;
    background: var(--primary);
}

.button-primary:hover:not(:disabled) {
    background: var(--primary-strong);
}

.button-secondary {
    color: var(--ink);
    border-color: var(--line-strong);
    background: #fff;
}

.button-quiet {
    color: var(--primary-strong);
    background: transparent;
}

.button-full {
    width: 100%;
}

.button-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.55rem;
    margin-top: 1rem;
}

.form-status {
    min-height: 1.45rem;
    margin: 0.75rem 0 0;
    color: var(--muted);
    font-size: 0.82rem;
    text-align: center;
}

.notice {
    padding: 1rem;
    border: 1px solid;
    border-radius: 0.75rem;
}

.notice strong {
    display: block;
    margin-bottom: 0.3rem;
}

.notice p {
    margin: 0.35rem 0 0;
}

.notice-error {
    margin-bottom: 1rem;
    color: var(--danger);
    border-color: #f4b7b0;
    background: var(--danger-bg);
}

.notice-warning {
    color: var(--warning);
    border-color: #f0cf8a;
    background: var(--warning-bg);
}

.notice-success {
    color: var(--success);
    border-color: #9ed7b9;
    background: var(--success-bg);
}

.auth-switch {
    margin: 1.4rem 0 0;
    color: var(--muted);
    font-size: 0.85rem;
    text-align: center;
}

.noscript-message {
    position: fixed;
    right: 1rem;
    bottom: 1rem;
    left: 1rem;
    max-width: 42rem;
    margin: auto;
    padding: 1rem;
    border: 1px solid #f4b7b0;
    border-radius: 0.75rem;
    color: var(--danger);
    background: var(--danger-bg);
    box-shadow: var(--shadow);
}

@media (max-width: 37.5rem) {
    .auth-layout {
        place-items: start center;
        padding: 0;
    }

    .auth-card,
    .auth-card-wide {
        min-height: 100vh;
        min-height: 100dvh;
        border: 0;
        border-radius: 0;
        box-shadow: none;
    }

    .form-grid {
        grid-template-columns: 1fr;
    }

    .button-row {
        align-items: stretch;
        flex-direction: column;
    }

    .button-row .button {
        width: 100%;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
    }
}