/* =============================================
   정율사관학원 강사 만족도 조사
   메인 스타일시트 v2.0
   ============================================= */

@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+KR:wght@300;400;500;600;700;800&display=swap');

/* ── Reset & Base ── */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --primary: #4F46E5;
    --primary-light: #6366F1;
    --primary-dark: #3730A3;
    --primary-bg: #EEF2FF;
    --secondary: #0EA5E9;
    --accent: #F59E0B;
    --success: #10B981;
    --danger: #EF4444;
    --text-primary: #1E293B;
    --text-secondary: #64748B;
    --text-muted: #94A3B8;
    --border: #E2E8F0;
    --border-light: #F1F5F9;
    --surface: #FFFFFF;
    --surface-2: #F8FAFC;
    --surface-3: #F1F5F9;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08), 0 2px 6px rgba(0,0,0,0.05);
    --shadow-lg: 0 10px 30px rgba(0,0,0,0.1), 0 4px 12px rgba(0,0,0,0.06);
    --shadow-xl: 0 20px 50px rgba(0,0,0,0.12), 0 8px 20px rgba(0,0,0,0.08);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #6B73FF 100%);
    min-height: 100vh;
    color: var(--text-primary);
    line-height: 1.6;
    padding: 24px 16px 48px;
    position: relative;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: 
        radial-gradient(ellipse at 20% 20%, rgba(255,255,255,0.08) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 80%, rgba(255,255,255,0.06) 0%, transparent 60%);
    pointer-events: none;
    z-index: 0;
}

/* ── 배경 장식 ── */
body::after {
    content: '';
    position: fixed;
    top: -50%; left: -50%;
    width: 200%; height: 200%;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    pointer-events: none;
    z-index: 0;
}

/* ── 컨테이너 ── */
.container {
    max-width: 720px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

/* ── 진행바 ── */
.progress-container {
    background: rgba(255,255,255,0.15);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: var(--radius-full);
    padding: 10px 18px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 14px;
    box-shadow: var(--shadow-md);
}

.progress-bar {
    flex: 1;
    height: 8px;
    background: rgba(255,255,255,0.2);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #FBBF24, #F59E0B);
    border-radius: var(--radius-full);
    transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 0 10px rgba(251, 191, 36, 0.5);
}

.progress-text {
    font-size: 13px;
    font-weight: 700;
    color: rgba(255,255,255,0.9);
    white-space: nowrap;
    min-width: 44px;
    text-align: right;
    letter-spacing: 0.5px;
}

/* ── 페이지 카드 ── */
.page {
    display: none;
    animation: fadeSlideIn 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.page.active {
    display: block;
}

@keyframes fadeSlideIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ── 페이지 헤더 ── */
.page-header {
    text-align: center;
    margin-bottom: 20px;
    padding: 0 8px;
}

.page-header h1 {
    font-size: clamp(22px, 5vw, 32px);
    font-weight: 800;
    color: #FFFFFF;
    letter-spacing: -0.5px;
    text-shadow: 0 2px 8px rgba(0,0,0,0.2);
    line-height: 1.3;
}

.page-header .subtitle {
    font-size: clamp(13px, 3vw, 16px);
    color: rgba(255,255,255,0.8);
    margin-top: 6px;
    font-weight: 400;
}

/* 학원 로고/타이틀 헤더 */
.academy-header {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.academy-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(255,255,255,0.15);
    border: 1px solid rgba(255,255,255,0.25);
    border-radius: var(--radius-full);
    padding: 6px 16px;
    font-size: 12px;
    font-weight: 600;
    color: rgba(255,255,255,0.9);
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 8px;
}

.academy-badge::before {
    content: '★';
    color: #FBBF24;
}

/* ── 콘텐츠 박스 ── */
.content-box {
    background: var(--surface);
    border-radius: var(--radius-xl);
    padding: clamp(20px, 5vw, 36px);
    box-shadow: var(--shadow-xl);
    border: 1px solid rgba(255,255,255,0.8);
}

/* ── 학년 선택 ── */
.section-label {
    font-size: 13px;
    font-weight: 700;
    color: var(--primary);
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 20px;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.section-label::before,
.section-label::after {
    content: '';
    flex: 1;
    max-width: 60px;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--primary-bg));
}

.section-label::after {
    background: linear-gradient(90deg, var(--primary-bg), transparent);
}

.content-box h2 {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    text-align: center;
    margin-bottom: 24px;
}

.grade-selection {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.grade-btn {
    width: 100%;
    padding: 18px 24px;
    background: var(--surface);
    border: 2px solid var(--border);
    border-radius: var(--radius-lg);
    font-size: 16px;
    font-weight: 600;
    font-family: inherit;
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 14px;
    position: relative;
    overflow: hidden;
}

.grade-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    opacity: 0;
    transition: var(--transition);
}

.grade-btn:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(79, 70, 229, 0.2);
}

.grade-btn:hover::before {
    opacity: 1;
}

.grade-btn:hover .grade-btn-text,
.grade-btn:hover .grade-icon {
    color: white;
    position: relative;
    z-index: 1;
}

.grade-btn:active {
    transform: translateY(0);
}

.grade-icon {
    font-size: 24px;
    position: relative;
    z-index: 1;
    transition: var(--transition);
}

.grade-btn-text {
    flex: 1;
    text-align: left;
    position: relative;
    z-index: 1;
    transition: var(--transition);
}

.grade-btn-arrow {
    color: var(--text-muted);
    position: relative;
    z-index: 1;
    transition: var(--transition);
    font-size: 18px;
}

.grade-btn:hover .grade-btn-arrow {
    color: rgba(255,255,255,0.8);
    transform: translateX(4px);
}

/* ── 안내 배너 ── */
.info-notice {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    background: var(--primary-bg);
    border: 1px solid rgba(79, 70, 229, 0.2);
    border-radius: var(--radius-md);
    padding: 14px 16px;
    margin-bottom: 24px;
    font-size: 13px;
    color: var(--primary-dark);
    font-weight: 500;
    line-height: 1.5;
}

.notice-icon {
    font-size: 16px;
    flex-shrink: 0;
    margin-top: 1px;
}

/* ── 과목별 선생님 선택 ── */
.subject-group {
    margin-bottom: 20px;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
}

.subject-group:hover {
    box-shadow: var(--shadow-md);
    border-color: rgba(79, 70, 229, 0.3);
}

.subject-title {
    background: linear-gradient(135deg, var(--primary-bg), #E0E7FF);
    padding: 12px 18px;
    font-size: 14px;
    font-weight: 700;
    color: var(--primary-dark);
    letter-spacing: 0.3px;
    border-bottom: 1px solid rgba(79, 70, 229, 0.15);
    display: flex;
    align-items: center;
    gap: 8px;
}

.subject-title::before {
    content: '';
    width: 4px;
    height: 16px;
    background: linear-gradient(180deg, var(--primary), var(--primary-light));
    border-radius: 2px;
    display: inline-block;
}

.teacher-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    gap: 8px;
    padding: 14px;
}

.teacher-checkbox {
    display: none;
}

.teacher-label {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 14px;
    background: var(--surface);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
    position: relative;
    user-select: none;
}

.teacher-label:hover {
    border-color: var(--primary-light);
    color: var(--primary);
    background: var(--primary-bg);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.teacher-checkbox:checked + .teacher-label {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-color: var(--primary);
    color: white;
    font-weight: 600;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.35);
    transform: translateY(-1px);
}

.teacher-checkbox:checked + .teacher-label::before {
    content: '✓ ';
    font-size: 12px;
}

/* ── 버튼 그룹 ── */
.button-group {
    display: flex;
    gap: 12px;
    margin-top: 28px;
}

.btn {
    flex: 1;
    padding: 14px 24px;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 700;
    font-family: inherit;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    letter-spacing: 0.3px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: white;
    box-shadow: 0 4px 14px rgba(79, 70, 229, 0.35);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(79, 70, 229, 0.45);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: var(--surface);
    color: var(--text-secondary);
    border: 1.5px solid var(--border);
}

.btn-secondary:hover {
    background: var(--surface-3);
    border-color: var(--text-muted);
    color: var(--text-primary);
}

/* ── 평가 폼 ── */
.teacher-name-header {
    text-align: center;
    padding: 20px;
    background: linear-gradient(135deg, var(--primary-bg), #E0E7FF);
    border-radius: var(--radius-lg);
    margin-bottom: 24px;
    border: 1px solid rgba(79, 70, 229, 0.15);
}

.teacher-name-header h3 {
    font-size: 22px;
    font-weight: 800;
    color: var(--primary-dark);
    margin-bottom: 4px;
}

.teacher-name-header p {
    font-size: 14px;
    color: var(--primary);
    font-weight: 600;
    background: white;
    display: inline-block;
    padding: 4px 14px;
    border-radius: var(--radius-full);
    border: 1px solid rgba(79, 70, 229, 0.2);
    margin-top: 6px;
}

/* ── 질문 섹션 ── */
.question-section {
    margin-bottom: 24px;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.section-title {
    font-size: 13px;
    font-weight: 700;
    color: var(--primary-dark);
    padding: 12px 18px;
    background: linear-gradient(135deg, var(--primary-bg), #E0E7FF);
    letter-spacing: 0.5px;
    border-bottom: 1px solid rgba(79, 70, 229, 0.12);
    display: flex;
    align-items: center;
    gap: 8px;
}

.section-title::before {
    content: '';
    width: 4px;
    height: 14px;
    background: linear-gradient(180deg, var(--primary), var(--primary-light));
    border-radius: 2px;
    display: inline-block;
}

.question-item {
    padding: 16px 18px;
    border-bottom: 1px solid var(--border-light);
    transition: var(--transition);
}

.question-item:last-child {
    border-bottom: none;
}

.question-item:hover {
    background: var(--surface-2);
}

.question-text {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 14px;
    line-height: 1.5;
}

/* ── 평가 옵션 (라디오 버튼) ── */
.rating-options {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 6px;
}

.rating-input {
    display: none;
    position: absolute;
}

.rating-label {
    cursor: pointer;
    display: block;
    grid-column: span 1;
}

.rating-button {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
    padding: 10px 4px;
    background: var(--surface);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-md);
    transition: var(--transition);
    min-height: 70px;
    justify-content: center;
}

.rating-button:hover {
    border-color: var(--primary-light);
    background: var(--primary-bg);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.rating-input:checked + .rating-label .rating-button {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-color: var(--primary);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

.rating-number {
    font-size: 16px;
    font-weight: 800;
    color: var(--text-secondary);
    transition: var(--transition);
    line-height: 1;
}

.rating-input:checked + .rating-label .rating-number {
    color: white;
}

.rating-text {
    font-size: 9.5px;
    color: var(--text-muted);
    text-align: center;
    line-height: 1.3;
    word-break: keep-all;
    transition: var(--transition);
}

.rating-input:checked + .rating-label .rating-text {
    color: rgba(255,255,255,0.85);
}

/* ── 텍스트에어리어 ── */
.textarea-question textarea {
    width: 100%;
    padding: 14px 16px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 14px;
    font-family: inherit;
    color: var(--text-primary);
    background: var(--surface);
    resize: vertical;
    min-height: 100px;
    transition: var(--transition);
    line-height: 1.6;
}

.textarea-question textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
    background: white;
}

.textarea-question textarea::placeholder {
    color: var(--text-muted);
}

/* ── 완료 페이지 ── */
.completion-box {
    text-align: center;
    padding: clamp(32px, 6vw, 52px) clamp(20px, 5vw, 40px);
}

.completion-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--success), #059669);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 36px;
    color: white;
    margin: 0 auto 24px;
    box-shadow: 0 8px 24px rgba(16, 185, 129, 0.35);
    animation: bounceIn 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes bounceIn {
    0% { transform: scale(0); opacity: 0; }
    60% { transform: scale(1.1); }
    100% { transform: scale(1); opacity: 1; }
}

.completion-box h2 {
    font-size: 22px;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.completion-message {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 24px;
}

.completion-details {
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 18px 24px;
    margin-bottom: 28px;
    text-align: left;
    font-size: 14px;
    line-height: 1.8;
    color: var(--text-secondary);
}

.completion-details p strong {
    color: var(--text-primary);
    font-weight: 700;
}

/* ── 유틸리티 ── */
.divider {
    height: 1px;
    background: var(--border);
    margin: 20px 0;
}

/* ── 월 배너 ── */
.month-banner {
    margin-bottom: 16px;
    border-radius: var(--radius-lg);
    padding: 16px 20px;
    display: flex;
    align-items: center;
    gap: 14px;
    box-shadow: var(--shadow-md);
    animation: fadeSlideIn 0.4s ease;
}

.month-banner.active {
    background: linear-gradient(135deg, rgba(255,255,255,0.22), rgba(255,255,255,0.12));
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.3);
}

.month-banner.closed {
    background: rgba(30,30,40,0.45);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.1);
}

.month-banner-icon {
    font-size: 28px;
    flex-shrink: 0;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.15));
}

.month-banner-body {
    flex: 1;
}

.month-banner-title {
    font-size: 15px;
    font-weight: 800;
    color: #fff;
    letter-spacing: -0.3px;
    text-shadow: 0 1px 4px rgba(0,0,0,0.15);
}

.month-banner-sub {
    font-size: 12px;
    color: rgba(255,255,255,0.78);
    margin-top: 3px;
    line-height: 1.4;
}

.month-banner-badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 5px 13px;
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 700;
    flex-shrink: 0;
    white-space: nowrap;
}

.month-banner-badge.open {
    background: rgba(16,185,129,0.25);
    border: 1px solid rgba(16,185,129,0.5);
    color: #6EE7B7;
}

.month-banner-badge.closed {
    background: rgba(239,68,68,0.2);
    border: 1px solid rgba(239,68,68,0.4);
    color: #FCA5A5;
}

.month-banner-badge::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    display: inline-block;
}

.month-banner-badge.open::before  { background: #10B981; box-shadow: 0 0 6px #10B981; animation: pulse-dot 1.5s infinite; }
.month-banner-badge.closed::before { background: #EF4444; }

@keyframes pulse-dot {
    0%, 100% { opacity: 1; transform: scale(1); }
    50%       { opacity: 0.5; transform: scale(1.3); }
}

/* 설문 마감 시 grade-btn 비활성화 */
.grade-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}
.grade-btn:disabled::before { display: none; }

/* ── 반응형 ── */
@media (max-width: 480px) {
    body {
        padding: 16px 12px 40px;
    }

    .content-box {
        padding: 20px 16px;
    }

    .rating-options {
        gap: 4px;
    }

    .rating-button {
        padding: 8px 2px;
        min-height: 64px;
    }

    .rating-number {
        font-size: 14px;
    }

    .rating-text {
        font-size: 8.5px;
    }

    .teacher-grid {
        grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
    }

    .button-group {
        flex-direction: column;
    }

    .btn {
        flex: none;
        width: 100%;
    }
}

@media (min-width: 600px) {
    .grade-selection {
        display: grid;
        grid-template-columns: 1fr;
        gap: 12px;
    }
}

/* ── 로딩 스피너 ── */
.loading-overlay {
    position: fixed;
    inset: 0;
    background: rgba(255,255,255,0.85);
    backdrop-filter: blur(4px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    gap: 16px;
}

.spinner {
    width: 44px;
    height: 44px;
    border: 4px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.loading-text {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
}

/* ── 토스트 알림 ── */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(80px);
    background: var(--text-primary);
    color: white;
    padding: 12px 24px;
    border-radius: var(--radius-full);
    font-size: 14px;
    font-weight: 500;
    box-shadow: var(--shadow-lg);
    z-index: 9999;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    white-space: nowrap;
    max-width: calc(100vw - 48px);
    text-align: center;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
}

.toast.success {
    background: linear-gradient(135deg, var(--success), #059669);
}

.toast.error {
    background: linear-gradient(135deg, var(--danger), #DC2626);
}