/* ============================================================
   EmoFEAT 인증 화면 (로그인 · 회원가입) — 2026-08-28 재설계
   두 페이지가 같은 클래스 어휘를 쓰므로 한 파일로 함께 관리한다.
   좌측 브랜드 패널 + 우측 폼의 2단 구성, 880px 미만에서 1단으로 접힌다.
   ============================================================ */

:root {
    --primary: #1e3a5f;
    --primary-dark: #0f2440;
    --primary-light: #2d5a8e;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --bg-page: #eef2f7;
    --surface: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border: #e2e8f0;
    --danger: #dc2626;
    --danger-bg: #fef2f2;
}

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

body {
    font-family: var(--font-sans);
    background: var(--bg-page);
    /* 아주 옅은 방사형 하이라이트 — 카드가 평면 위에 떠 보이게 */
    background-image:
        radial-gradient(circle at 15% 12%, rgba(59,130,246,0.10), transparent 45%),
        radial-gradient(circle at 85% 88%, rgba(30,58,95,0.10), transparent 45%);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2.5rem 1.25rem;
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
}

/* ── 카드 ───────────────────────────────────────────────── */
.login-container,
.signup-container {
    width: 100%;
    max-width: 900px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 18px;
    box-shadow: 0 1px 2px rgba(15,36,64,.04), 0 12px 32px -12px rgba(15,36,64,.18);
    overflow: hidden;
    display: grid;
    grid-template-columns: 340px 1fr;
    /* 플렉스 자식의 min-width:auto가 카드를 뷰포트 밖으로 밀어내는 것을 막는다 */
    min-width: 0;
    max-width: min(900px, 100%);
}
/* 그리드 자식도 같은 이유로 최소폭을 풀어준다 */
.logo, .auth-body { min-width: 0; }

/* ── 좌측 브랜드 패널 ───────────────────────────────────── */
.logo {
    grid-column: 1;
    background: linear-gradient(160deg, var(--primary-dark) 0%, var(--primary) 55%, var(--primary-light) 100%);
    color: #fff;
    padding: 2.75rem 2rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
    overflow: hidden;
}
.logo::after {
    /* 우하단 광택 */
    content: '';
    position: absolute;
    right: -60px; bottom: -80px;
    width: 240px; height: 240px;
    background: radial-gradient(circle, rgba(255,255,255,.13), transparent 70%);
    pointer-events: none;
}
.logo h1 {
    font-size: 1.95rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: #fff;
    margin-bottom: 0.6rem;
}
.logo p {
    font-size: 0.82rem;
    line-height: 1.6;
    color: rgba(255,255,255,.72);
}
/* 브랜드 패널 하단 특징 목록 */
.auth-points {
    list-style: none;
    margin-top: 2rem;
    display: flex;
    flex-direction: column;
    gap: 0.7rem;
}
.auth-points li {
    display: flex;
    align-items: flex-start;
    gap: 0.55rem;
    font-size: 0.8rem;
    line-height: 1.5;
    color: rgba(255,255,255,.86);
}
.auth-points li::before {
    content: '';
    flex: 0 0 auto;
    width: 6px; height: 6px;
    margin-top: 0.45rem;
    border-radius: 50%;
    background: #7dd3fc;
}

/* ── 우측 폼 영역 ───────────────────────────────────────── */
.auth-body {
    grid-column: 2;
    padding: 2.75rem 2.75rem 2.25rem;
}

.login-title,
.signup-title { margin-bottom: 1.75rem; }
.login-title h2,
.signup-title h2 {
    font-size: 1.4rem;
    font-weight: 700;
    letter-spacing: -0.015em;
    color: var(--text-primary);
    margin-bottom: 0.35rem;
}
.login-title p,
.signup-title p {
    color: var(--text-secondary);
    font-size: 0.875rem;
    line-height: 1.55;
}

/* ── 폼 컨트롤 ──────────────────────────────────────────── */
.form-group { margin-bottom: 1.15rem; }
.form-group label {
    display: block;
    margin-bottom: 0.4rem;
    font-weight: 500;
    font-size: 0.8rem;
    color: var(--text-primary);
}
.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"] {
    width: 100%;
    padding: 0.7rem 0.85rem;
    background: #f8fafc;
    border: 1px solid var(--border);
    border-radius: 9px;
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.92rem;
    min-width: 0;
    transition: border-color .18s, box-shadow .18s, background .18s;
}
.form-group input:focus {
    outline: none;
    background: #fff;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(59,130,246,.16);
}
.form-group input::placeholder { color: var(--text-muted); }

.field-error {
    display: none;
    margin-top: 0.4rem;
    font-size: 0.78rem;
    color: var(--danger);
}
.field-error.show { display: block; }

/* ── 약관 동의 체크박스 — 그리드로 오와 열을 맞춘다 ─────── */
.auth-check {
    display: grid;
    grid-template-columns: auto 1fr;
    column-gap: 0.6rem;
    align-items: start;
    font-size: 0.82rem;
    line-height: 1.55;
    color: var(--text-secondary);
    font-weight: 400;
    cursor: pointer;
}
.auth-check input[type="checkbox"] {
    width: 16px;
    height: 16px;
    margin: 0;
    /* 첫 줄 텍스트의 광학 중심에 맞춘 값: (0.82rem*1.55 - 16px) / 2 */
    margin-top: 0.115rem;
    accent-color: var(--accent);
    cursor: pointer;
    flex: none;
}
.auth-check a { color: var(--accent); text-decoration: none; }
.auth-check a:hover { text-decoration: underline; }
.auth-check .req { color: var(--danger); }

/* ── 버튼 ───────────────────────────────────────────────── */
.login-btn,
.signup-btn {
    width: 100%;
    margin-top: 1.4rem;
    padding: 0.8rem 1rem;
    background: var(--primary);
    color: #fff;
    border: 1px solid var(--primary);
    border-radius: 9px;
    font-family: var(--font-sans);
    font-size: 0.92rem;
    font-weight: 600;
    cursor: pointer;
    transition: background .18s, border-color .18s, box-shadow .18s;
}
.login-btn:hover,
.signup-btn:hover {
    background: var(--primary-light);
    border-color: var(--primary-light);
    box-shadow: 0 6px 16px -8px rgba(30,58,95,.55);
}
.login-btn:focus-visible,
.signup-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ── 알림 ───────────────────────────────────────────────── */
.error-message {
    background: var(--danger-bg);
    border: 1px solid #fecaca;
    color: #b91c1c;
    padding: 0.7rem 0.9rem;
    border-radius: 9px;
    margin-bottom: 1.25rem;
    font-size: 0.84rem;
    line-height: 1.5;
}
.info-box {
    background: #f1f5f9;
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 0.85rem 1rem;
    margin-top: 1.5rem;
}
.info-box p {
    color: var(--text-secondary);
    font-size: 0.81rem;
    line-height: 1.6;
}
.info-box strong { color: var(--text-primary); font-weight: 600; }

/* ── 하단 링크 ──────────────────────────────────────────── */
.signup-prompt,
.login-prompt {
    margin-top: 1.5rem;
    padding-top: 1.25rem;
    border-top: 1px solid var(--border);
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-secondary);
}
.signup-prompt a,
.login-prompt a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
}
.signup-prompt a:hover,
.login-prompt a:hover { text-decoration: underline; }

.back-link { text-align: center; margin-top: 0.9rem; }
.back-link a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.8rem;
    transition: color .18s;
}
.back-link a:hover { color: var(--primary); }

footer {
    margin-top: 1.75rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.78rem;
}
footer a { color: var(--text-muted); text-decoration: none; }
footer a:hover { color: var(--primary); }

/* ── 언어 전환 ──────────────────────────────────────────── */
.lang-switch {
    position: absolute;
    top: 1.15rem;
    right: 1.25rem;
    padding: 5px 12px;
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
    background: rgba(255,255,255,.85);
    text-decoration: none;
    border: 1px solid var(--border);
    border-radius: 6px;
    transition: all .18s;
}
.lang-switch:hover { color: var(--primary); border-color: var(--primary); }

/* ── 반응형 — 브랜드 패널을 상단 띠로 ──────────────────── */
@media (max-width: 880px) {
    .login-container,
    .signup-container { max-width: min(460px, 100%); grid-template-columns: 1fr; }
    .logo { grid-column: 1; padding: 1.85rem 1.75rem; }
    .logo h1 { font-size: 1.6rem; margin-bottom: 0.35rem; }
    .auth-points { display: none; }   /* 좁은 화면에선 폼에 집중 */
    .auth-body { grid-column: 1; padding: 1.85rem 1.75rem 1.6rem; }
}
@media (max-width: 420px) {
    body { padding: 1.25rem 0.9rem; }
    .auth-body { padding: 1.5rem 1.25rem 1.35rem; }
}