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

:root {
    --bg: #0a0a0a;
    --bg-card: #111111;
    --bg-input: #1a1a1a;
    --border: #2a2a2a;
    --border-focus: #505050;
    --text-primary: #f0f0f0;
    --text-secondary: #666;
    --text-muted: #444;
    --accent: #e8ff47;
    --accent-dim: rgba(232, 255, 71, 0.1);
    --font-display: 'Syne', sans-serif;
    --font-mono: 'DM Mono', monospace;
}

body {
    background-color: var(--bg);
    color: var(--text-primary);
    font-family: var(--font-display);
    min-height: 100vh;
    overflow-x: hidden;
}

/* 노이즈 텍스처 오버레이 */
.noise {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 100;
    opacity: 0.03;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
    background-repeat: repeat;
    background-size: 128px;
}

/* ── 인증 페이지 (로그인/회원가입) ── */
.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.auth-card {
    width: 100%;
    max-width: 400px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 2.5rem;
    animation: fadeUp 0.5s ease both;
}

.auth-header {
    margin-bottom: 2rem;
}

.auth-label {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.2em;
    color: var(--accent);
    display: block;
    margin-bottom: 0.5rem;
}

.auth-header h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.03em;
}

/* 폼 */
.auth-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.field {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.field label {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.1em;
    color: var(--text-secondary);
    text-transform: uppercase;
}

.field input {
    background: var(--bg-input);
    border: 1px solid var(--border);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.95rem;
    padding: 0.75rem 1rem;
    outline: none;
    transition: border-color 0.2s, background 0.2s;
    width: 100%;
}

.field input::placeholder {
    color: var(--text-muted);
}

.field input:focus {
    border-color: var(--border-focus);
    background: #1f1f1f;
}

/* 버튼 */
.btn-primary {
    background: var(--accent);
    color: #0a0a0a;
    border: none;
    font-family: var(--font-display);
    font-size: 0.9rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    padding: 0.85rem;
    cursor: pointer;
    margin-top: 0.5rem;
    transition: opacity 0.2s, transform 0.1s;
    width: 100%;
}

.btn-primary:hover {
    opacity: 0.85;
}

.btn-primary:active {
    transform: scale(0.99);
}

.btn-secondary {
    display: inline-block;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    padding: 0.6rem 1.2rem;
    text-decoration: none;
    margin-top: 1.5rem;
    transition: border-color 0.2s, color 0.2s;
    text-transform: uppercase;
}

.btn-secondary:hover {
    border-color: var(--border-focus);
    color: var(--text-primary);
}

.auth-link {
    margin-top: 1.5rem;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-align: center;
}

.auth-link a {
    color: var(--accent);
    text-decoration: none;
}

.auth-link a:hover {
    text-decoration: underline;
}

/* ── 프로필 페이지 ── */
.profile-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.profile-card {
    width: 100%;
    max-width: 460px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 2.5rem;
    animation: fadeUp 0.5s ease both;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.profile-avatar {
    width: 64px;
    height: 64px;
    background: var(--accent-dim);
    border: 1px solid var(--accent);
    color: var(--accent);
    font-size: 1.5rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    font-family: var(--font-mono);
}

.profile-info {
    margin-bottom: 2rem;
}

.profile-info h1 {
    font-size: 2.2rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    margin-top: 0.4rem;
}

.profile-meta {
    width: 100%;
    border-top: 1px solid var(--border);
    padding-top: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.meta-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.meta-label {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.1em;
    color: var(--text-secondary);
    text-transform: uppercase;
}

.meta-value {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-primary);
}

.meta-value.status {
    color: #4ade80;
    font-size: 0.75rem;
}

/* 아이디 중복확인 */
.input-check-row {
    display: flex;
    gap: 0.5rem;
}

.input-check-row input {
    flex: 1;
}

.btn-check {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.05em;
    padding: 0 0.9rem;
    cursor: pointer;
    white-space: nowrap;
    transition: border-color 0.2s, color 0.2s;
}

.btn-check:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.check-result {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.05em;
    min-height: 1rem;
    display: block;
}

.check-result.available {
    color: #4ade80;
}

.check-result.taken {
    color: #f87171;
}

/* 폼 에러 메시지 */
.form-error {
    background: rgba(248, 113, 113, 0.08);
    border: 1px solid rgba(248, 113, 113, 0.3);
    color: #f87171;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    padding: 0.65rem 0.9rem;
    letter-spacing: 0.03em;
}

/* 애니메이션 */
@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}