/* 브라우저 양식 초기화 코드 */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
a { text-decoration: none; color: inherit; }
button, input { font-family: inherit; }

/* 디자인 토큰 (피그마) */
:root {
    --bg:             rgba(255, 186, 37, 0.15);
    --accent:         #FFBA25;
    --accent-hover:   #e6a800;
    --card-bg:        #FFFFFF;
    --card-shadow:    2px 4px 4px rgba(0, 0, 0, 0.25);
    --card-radius:    30px;
    --input-border:   #D9D9D9;
    --input-radius:   15px;
    --placeholder:    #D9D9D9;
    --text-primary:   #000000;
    --text-secondary: #000000;
    --btn-radius:     15px;
    --transition:     0.18s ease;
}

/* ─── Page Shell ─────────────────────────────────── */
body {
    min-height: 100dvh;
    background-color: var(--bg);
    font-family: 'Noto Sans JP', sans-serif;
    color: var(--text-primary);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 60px 16px 60px;
}

/* ─── Page switcher (tab nav) ────────────────────── */
/* Hidden — state is managed by JS */
.page { display: none; width: 100%; max-width: 512px; }
.page.active { display: block; }

/* ─── Back link ──────────────────────────────────── */
.back-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 20px;
    font-weight: 400;
    color: var(--text-primary);
    margin-bottom: 28px;
    cursor: pointer;
    transition: opacity var(--transition);
}
.back-link:hover { opacity: .65; }

/* ─── Card ───────────────────────────────────────── */
.card {
    width: 100%;
    background: var(--card-bg);
    box-shadow: var(--card-shadow);
    border-radius: var(--card-radius);
    padding: 48px 57px 52px;
}

/* ─── Card Header ────────────────────────────────── */
.card-title {
    font-size: 40px;
    font-weight: 600;
    line-height: 1.2;
    text-align: center;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.card-subtitle {
    font-size: 20px;
    font-weight: 400;
    text-align: center;
    color: var(--text-primary);
    margin-bottom: 36px;
    line-height: 1.4;
}

/* ─── Field Group ────────────────────────────────── */
.field-group {
    margin-bottom: 20px;
}

.field-label {
    font-size: 18px;
    font-weight: 400;
    color: var(--text-primary);
    margin-bottom: 8px;
    display: block;
}

.field-input {
    width: 100%;
    height: 68px;
    padding: 0 20px;
    font-size: 20px;
    font-weight: 500;
    color: var(--text-primary);
    background: var(--card-bg);
    border: 1px solid var(--input-border);
    border-radius: var(--input-radius);
    outline: none;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.field-input::placeholder {
    color: var(--placeholder);
    font-weight: 500;
}

.field-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(255, 186, 37, 0.20);
}

/* ─── Options Row (login page) ───────────────────── */
.options-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 16px 0 24px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 16px;
    font-weight: 400;
    color: var(--text-primary);
    cursor: pointer;
    user-select: none;
}

.checkbox-label input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--accent);
    cursor: pointer;
}

.forgot-link {
    font-size: 16px;
    font-weight: 400;
    color: var(--accent);
    transition: opacity var(--transition);
}
.forgot-link:hover { opacity: .7; }

/* ─── Primary Button ─────────────────────────────── */
.btn-primary {
    width: 100%;
    height: 66px;
    background: var(--accent);
    border: 1px solid var(--input-border);
    border-radius: var(--btn-radius);
    font-size: 20px;
    font-weight: 700;
    color: #FFFFFF;
    cursor: pointer;
    transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
    margin-bottom: 0;
}
.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(255, 186, 37, .35);
}
.btn-primary:active { transform: translateY(0); }

/* ─── Outline Button (회원가입 페이지 하단) ──────── */
.btn-outline {
    height: 56px;
    border: 2px solid var(--accent);
    border-radius: var(--btn-radius);
    background: transparent;
    font-size: 20px;
    font-weight: 700;
    cursor: pointer;
    transition: background var(--transition), color var(--transition);
}

/* ─── Bottom Text Link ───────────────────────────── */
.bottom-text {
    text-align: center;
    font-size: 20px;
    font-weight: 400;
    color: var(--text-primary);
    margin-top: 24px;
    line-height: 1.5;
}

.bottom-link {
    font-size: 20px;
    font-weight: 700;
    color: var(--accent);
    cursor: pointer;
    transition: opacity var(--transition);
}
.bottom-link:hover { opacity: .7; }

/* ─── Signup: two-button row ─────────────────────── */
.btn-row {
    display: flex;
    gap: 22px;
    margin-top: 28px;
}

.btn-row .btn-half {
    flex: 1;
    height: 56px;
    border-radius: var(--btn-radius);
    font-size: 20px;
    font-weight: 700;
    cursor: pointer;
    transition: background var(--transition), color var(--transition), transform var(--transition);
}

.btn-half.inactive {
    background: var(--input-border);
    border: 1px solid #FFFFFF;
    color: var(--text-primary);
}
.btn-half.inactive:hover { background: #c8c8c8; }

.btn-half.active-btn {
    background: var(--accent);
    border: 1px solid var(--input-border);
    color: #FFFFFF;
}
.btn-half.active-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

/* ─── Responsive ─────────────────────────────────── */
@media (max-width: 560px) {
    .card { padding: 40px 28px 44px; }
    .card-title { font-size: 32px; }
    .card-subtitle { font-size: 16px; }
    .field-input { height: 58px; font-size: 17px; }
    .btn-primary { height: 58px; }
    .options-row { flex-wrap: wrap; gap: 10px; }
}