/* ===== CSS 변수 (라이트/다크 모드) ===== */
:root {
    --bg:           #F0EEE9;
    --bg-card:      #E8E4DE;
    --bg-deep:      #DDD8D2;
    --bg-nav:       rgba(240,238,233,0.95);
    --primary:      #5C8A6A;
    --primary-dim:  rgba(92,138,106,0.15);
    --secondary:    #3d6b50;
    --text:         #1a1a18;
    --text-dim:     #6a7a6e;
    --text-sub:     #8a9a8e;
    --border:       #d0ccc6;
    --border-card:  rgba(92,138,106,0.2);
    --danger:       #c0392b;
    --shadow:       rgba(0,0,0,0.08);
    --nav-border:   rgba(92,138,106,0.2);
    /* 하위 호환 별칭 */
    --bg-dark:      var(--bg);
    --card-bg:      var(--bg-card);
    --text-white:   var(--text);
    --learning-yellow: #b07a20;
    --grass-l1: #a8c8b4;
    --grass-l2: #6fa882;
    --grass-l3: #3d7a56;
}

/* ===== 다크 모드 ===== */
[data-theme="dark"] {
    --bg:           #2a2420;
    --bg-card:      #322c28;
    --bg-deep:      #1e1a17;
    --bg-nav:       rgba(42,36,32,0.95);
    --primary:      #B2E2D2;
    --primary-dim:  rgba(178,226,210,0.12);
    --secondary:    #7ab8a8;
    --text:         #F5F5DC;
    --text-dim:     #a0b4ac;
    --text-sub:     #7a8a86;
    --border:       rgba(178,226,210,0.15);
    --border-card:  rgba(178,226,210,0.15);
    --danger:       #e07060;
    --shadow:       rgba(0,0,0,0.3);
    --nav-border:   rgba(178,226,210,0.15);
    --bg-dark:      var(--bg);
    --card-bg:      var(--bg-card);
    --text-white:   var(--text);
    --learning-yellow: #c9a050;
    --grass-l1: #4a8a72;
    --grass-l2: #6fb89a;
    --grass-l3: #B2E2D2;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: 'Noto Sans KR', sans-serif;
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.7;
    overflow-x: hidden;
    transition: background-color 0.3s, color 0.3s;
}
h1, h2, h3, .logo, .card-label { font-family: 'Orbitron', sans-serif; }

nav {
    background: var(--bg-nav);
    backdrop-filter: blur(10px);
    padding: 1.2rem 8%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--nav-border);
}
nav .logo { 
    font-weight: 700; font-size: 1.4rem; color: var(--primary); letter-spacing: 2px;
    text-decoration: none;
    transition: 0.2s;
}
nav .logo:hover {
    text-shadow: 0 0 20px var(--primary-dim);
}
nav .links { display: flex; align-items: center; gap: 2rem; }
nav .links a {
    text-decoration: none; color: var(--text); font-size: 0.9rem;
    transition: 0.3s; display: flex; align-items: center; gap: 6px;
    position: relative;
    padding: 4px 0;
}
nav .links a:hover { color: var(--primary); }
nav .links a.nav-active {
    color: var(--primary);
}
nav .links a.nav-active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--primary);
    box-shadow: 0 0 8px var(--primary);
}

/* ===== 버튼 (공통) ===== */
.btn {
    padding: 0.6rem 1.2rem; border-radius: 6px;
    font-family: 'Orbitron', sans-serif; font-size: 0.75rem; letter-spacing: 1.5px;
    cursor: pointer; border: none; transition: 0.3s;
    display: inline-flex; align-items: center; gap: 8px;
}
.btn-primary { background: var(--primary); color: var(--bg); font-weight: 700; }
.btn-primary:hover { background: var(--text); color: var(--bg); transform: translateY(-2px); }
.btn-outline { background: transparent; border: 1px solid var(--primary); color: var(--primary); }
.btn-outline:hover { background: var(--primary); color: var(--bg); }
.btn-danger { background: transparent; border: 1px solid var(--danger); color: var(--danger); }
.btn-danger:hover { background: var(--danger); color: #fff; }


/* ===== 모달 (공통) ===== */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(8px);
    z-index: 2000;
    justify-content: center; align-items: center;
    padding: 20px;
}
.modal-overlay.active { display: flex; }
.modal {
    background: var(--bg-card); color: var(--text);
    background: var(--bg-card);
    border: 1px solid rgba(var(--primary-rgb, 92,138,106), 0.3);
    border-radius: 1rem;
    padding: 2rem;
    max-width: 600px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
}
.modal.modal-wide {
    max-width: min(66vw, 900px);
    width: 100%;
}
.modal h2 {
    color: var(--primary); margin-bottom: 1.5rem;
    font-size: 1.4rem; letter-spacing: 1px; padding-right: 40px;
}
.modal-close-x {
    position: absolute;
    top: 1.2rem; right: 1.2rem;
    width: 32px; height: 32px;
    display: flex; align-items: center; justify-content: center;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-dim); cursor: pointer;
    font-size: 0.9rem; transition: 0.2s; z-index: 5;
}
.modal-close-x:hover {
    color: var(--danger); border-color: var(--danger);
    transform: rotate(90deg);
}

.form-group { margin-bottom: 1.2rem; }
.form-group label {
    display: block; margin-bottom: 6px; font-size: 0.85rem;
    color: var(--text-dim); font-family: 'Orbitron', sans-serif; letter-spacing: 1px;
}
.form-group input, .form-group textarea, .form-group select {
    width: 100%; padding: 12px;
    background: var(--bg-deep);
    border: 1px solid var(--border); border-radius: 6px;
    color: var(--text); font-family: 'Noto Sans KR', sans-serif;
    font-size: 0.95rem; transition: 0.3s;
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
    outline: none; border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--border);
}
.form-group textarea { min-height: 100px; resize: vertical; }
.modal-actions {
    display: flex; gap: 10px; justify-content: flex-end; margin-top: 1.5rem;
}
.alert {
    padding: 12px; border-radius: 6px; margin-bottom: 1rem; font-size: 0.9rem;
}
.alert-error { background: rgba(255, 71, 87, 0.1); border: 1px solid var(--danger); color: var(--danger); }
.alert-success { background: var(--border); border: 1px solid var(--primary); color: var(--primary); }


/* ===== 테마 토글 버튼 ===== */
.theme-toggle {
    background: var(--primary-dim);
    border: 1px solid var(--border-card);
    color: var(--primary);
    width: 34px; height: 34px;
    border-radius: 8px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    transition: 0.2s;
    flex-shrink: 0;
}
.theme-toggle:hover {
    background: var(--primary);
    color: var(--bg);
}

/* ===== 푸터 관리자 토글 ===== */

footer {
    padding: 60px 8% 30px;
    text-align: center;
    border-top: 1px solid var(--border);
    color: var(--text-dim);
    font-size: 0.9rem;
}
footer .admin-toggle {
    display: inline-block; margin-top: 10px;
    opacity: 0.3; cursor: pointer; transition: 0.3s;
}
footer .admin-toggle:hover { opacity: 1; color: var(--primary); }

/* ===== 반응형 공통 (nav + modal) ===== */
@media (max-width: 768px) {
    nav { padding: 0.9rem 4%; flex-wrap: wrap; gap: 8px; }
    nav .logo { font-size: 1.1rem; letter-spacing: 1px; }
    nav .links { gap: 1rem; }
    nav .links a { font-size: 0.8rem; }
    .modal-overlay { padding: 12px; }
    .modal.modal-wide { max-width: 92vw; }
    .modal-actions .btn { width: 100%; justify-content: center; padding: 0.8rem; font-size: 0.8rem; }
}
@media (max-width: 380px) {
    nav .logo { font-size: 0.95rem; }
    nav .links { gap: 0.6rem; }
    nav .links a { font-size: 0.75rem; }
}