/* ==============================================================
   로보그램 코딩캠프 수료증 발급 웹앱 - 스타일시트
   (반응형 모바일/노트북 UI & A4 정밀 인쇄 최적화)
   ============================================================== */

@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+KR:wght@300;400;500;700;900&family=Playfair+Display:ital,wght@0,600;0,700;1,600&display=swap');

:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --primary-light: #e0e7ff;
    --gold: #DAA520;
    --gold-dark: #b8860b;
    --gold-light: #fef9c3;
    --dark: #1e293b;
    --gray-bg: #f8fafc;
    --border-color: #e2e8f0;
    --cert-width: 800px;
    --cert-height: 1060px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--gray-bg);
    color: var(--dark);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    word-break: keep-all;
    overflow-wrap: break-word;
}

/* PC와 모바일 모두에서 한글 단어 및 의미 단위 줄바꿈(글자 쪼개짐 방지) 보장 */
h1, h2, h3, h4, h5, h6, p, span, div, a, label, li, button, input, select, textarea,
.cert-content, .hero-title, .hero-desc, .login-panel-desc, .cert-statement, .cert-info-list, .form-help, .modal-card {
    word-break: keep-all;
    overflow-wrap: break-word;
}

/* ---------------- 네비게이션 헤더 ---------------- */
.app-header {
    background: #ffffff;
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 50;
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0.85rem 1.25rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo-wrap {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: inherit;
}

.logo-img {
    height: 40px;
    width: auto;
    object-fit: contain;
}

.logo-text h1 {
    font-size: 1.15rem;
    font-weight: 800;
    color: #1e1b4b;
    line-height: 1.2;
}

.logo-text p {
    font-size: 0.75rem;
    color: #6366f1;
    font-weight: 600;
    letter-spacing: -0.02em;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.btn-nav {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 0.9rem;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all 0.2s ease;
}

.btn-nav-admin {
    background-color: #f1f5f9;
    color: #475569;
    border-color: #cbd5e1;
}

.btn-nav-admin:hover {
    background-color: #e2e8f0;
    color: #0f172a;
}

.btn-nav-logout {
    background-color: #fee2e2;
    color: #b91c1c;
}

.btn-nav-logout:hover {
    background-color: #fecaca;
}

/* 상단 헤더 우측 상태 뱃지 */
.system-status-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.42rem 0.95rem;
    background: #f0fdf4;
    border: 1px solid #bbf7d0;
    border-radius: 9999px;
    font-size: 0.8rem;
    font-weight: 600;
    color: #166534;
    box-shadow: 0 1px 3px rgba(22, 101, 52, 0.05);
}

.status-pulse-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: #22c55e;
    box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.7);
    animation: pulseGreen 2s infinite;
}

@keyframes pulseGreen {
    0% {
        transform: scale(0.95);
        box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.7);
    }
    70% {
        transform: scale(1);
        box-shadow: 0 0 0 6px rgba(34, 197, 94, 0);
    }
    100% {
        transform: scale(0.95);
        box-shadow: 0 0 0 0 rgba(34, 197, 94, 0);
    }
}

@media (max-width: 640px) {
    .system-status-tag {
        display: none;
    }
}

/* ---------------- 메인 컨테이너 ---------------- */
.main-wrapper {
    flex: 1;
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    padding: 1.5rem 1rem 3rem 1rem;
}

/* ---------------- 탭 & 카드 ---------------- */
.card-box {
    background: #ffffff;
    border-radius: 16px;
    box-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.06);
    border: 1px solid var(--border-color);
    padding: 2rem;
    margin-bottom: 2rem;
}

/* ---------------- 웅장하고 고급스러운 시작 화면 (Hero + Login) ---------------- */
.hero-login-section {
    max-width: 1080px;
    margin: 2rem auto;
    background: #ffffff;
    border-radius: 24px;
    border: 1px solid rgba(226, 232, 240, 0.8);
    box-shadow: 0 25px 50px -12px rgba(15, 23, 42, 0.09), 0 0 1px 1px rgba(0, 0, 0, 0.02);
    overflow: hidden;
    display: grid;
    grid-template-columns: 1.15fr 1fr;
    position: relative;
}

@media (max-width: 950px) {
    .hero-login-section {
        grid-template-columns: 1fr;
        max-width: 520px;
        margin: 1.25rem auto;
    }
}

/* 좌측 히어로 비주얼 패널 */
.hero-visual-panel {
    background: linear-gradient(145deg, #1e1b4b 0%, #2e287a 45%, #4338ca 100%);
    color: #ffffff;
    padding: 3.5rem 3rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: relative;
    overflow: hidden;
}

.hero-visual-panel::before {
    content: '';
    position: absolute;
    top: -60px;
    right: -60px;
    width: 260px;
    height: 260px;
    background: radial-gradient(circle, rgba(218, 165, 32, 0.3) 0%, rgba(218, 165, 32, 0) 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.45rem 1rem;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.25);
    border-radius: 9999px;
    font-size: 0.82rem;
    font-weight: 700;
    color: #fef08a; /* 은은한 골드 */
    width: fit-content;
    margin-bottom: 1.25rem;
}

.hero-title {
    font-size: 2.15rem;
    font-weight: 900;
    line-height: 1.35;
    letter-spacing: -0.02em;
    margin-bottom: 0.85rem;
}

.hero-title .highlight {
    background: linear-gradient(90deg, #facc15 0%, #60a5fa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-desc {
    font-size: 0.95rem;
    color: #e0e7ff;
    line-height: 1.65;
    margin-bottom: 1.5rem;
    opacity: 0.92;
}

/* 마스코트 캐릭터 쇼케이스 */
.hero-mascot-wrap {
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    margin: 1.5rem 0 1.25rem 0;
    min-height: 220px;
}

.hero-mascot-glow {
    position: absolute;
    width: 210px;
    height: 210px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(129, 140, 248, 0.45) 0%, rgba(99, 102, 241, 0.2) 50%, transparent 75%);
    filter: blur(14px);
    pointer-events: none;
    z-index: 1;
    animation: glowPulse 4s ease-in-out infinite alternate;
}

.hero-mascot-img {
    max-width: 200px;
    width: 100%;
    height: auto;
    filter: drop-shadow(0 20px 28px rgba(0, 0, 0, 0.45));
    animation: floatingMascot 4s ease-in-out infinite alternate;
    position: relative;
    z-index: 2;
}

@keyframes glowPulse {
    0% { transform: scale(0.92); opacity: 0.65; }
    100% { transform: scale(1.15); opacity: 0.95; }
}

@keyframes floatingMascot {
    0% { transform: translateY(0); }
    100% { transform: translateY(-12px); }
}

/* 특장점 리스트 */
.hero-feature-tags {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.15);
}

.hero-feature-item {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    font-size: 0.88rem;
    color: #f1f5f9;
}

.hero-feature-icon {
    width: 24px;
    height: 24px;
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.18);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    flex-shrink: 0;
}

/* 우측 로그인 폼 패널 */
.login-form-panel {
    padding: 3.5rem 3rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    background: #ffffff;
}

@media (max-width: 600px) {
    .main-wrapper {
        padding: 0.75rem 0.5rem 2rem 0.5rem;
    }
    .hero-login-section {
        margin: 0.5rem auto;
        border-radius: 18px;
    }
    .hero-visual-panel {
        padding: 2rem 1.25rem 1.5rem 1.25rem;
    }
    .hero-title {
        font-size: 1.55rem;
        line-height: 1.35;
    }
    .hero-desc {
        font-size: 0.85rem;
        margin-bottom: 1rem;
    }
    .hero-mascot-wrap {
        margin: 0.75rem 0;
    }
    .hero-mascot-img {
        max-width: 170px;
    }
    .hero-feature-tags {
        gap: 0.5rem;
        padding-top: 1rem;
    }
    .hero-feature-item {
        font-size: 0.8rem;
    }
    .login-form-panel {
        padding: 2rem 1.25rem;
    }
    .login-panel-title {
        font-size: 1.35rem;
    }
    .student-panel {
        padding: 1.25rem;
        border-radius: 14px;
    }
    .certificate-preview-container {
        padding: 1rem 0;
        border-radius: 12px;
        overflow-x: hidden;
    }
}

.login-panel-title {
    font-size: 1.6rem;
    font-weight: 800;
    color: #0f172a;
    margin-bottom: 0.4rem;
}

.login-panel-desc {
    font-size: 0.88rem;
    color: #64748b;
    margin-bottom: 1.75rem;
    line-height: 1.5;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: #334155;
    margin-bottom: 0.4rem;
}

.form-input, .form-select {
    width: 100%;
    padding: 0.85rem 1.05rem;
    border-radius: 12px;
    border: 1.5px solid #cbd5e1;
    font-size: 0.95rem;
    color: #1e293b;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    background-color: #ffffff;
}

.form-input:focus, .form-select:focus {
    outline: none;
    border-color: #6366f1;
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.16);
    background-color: #ffffff;
}

.form-help {
    font-size: 0.78rem;
    color: #94a3b8;
    margin-top: 0.35rem;
}

.btn-primary {
    width: 100%;
    padding: 0.95rem 1.25rem;
    background: linear-gradient(135deg, #4f46e5 0%, #3b82f6 100%);
    color: #ffffff;
    border: none;
    border-radius: 12px;
    font-size: 1.02rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    box-shadow: 0 6px 18px rgba(79, 70, 229, 0.32);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 24px rgba(79, 70, 229, 0.45);
    background: linear-gradient(135deg, #4338ca 0%, #2563eb 100%);
}

.btn-primary:active {
    transform: translateY(0);
    box-shadow: 0 3px 10px rgba(79, 70, 229, 0.28);
}

/* 하단 robogram.net 안내 카드 */
.login-notice-card {
    margin-top: 1.5rem;
    padding: 0.95rem 1.15rem;
    background: linear-gradient(135deg, #f8faff 0%, #eff6ff 100%);
    border: 1px solid #bfdbfe;
    border-radius: 14px;
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    text-align: left;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.04);
}

.login-notice-card .notice-icon {
    font-size: 1.15rem;
    line-height: 1.3;
    flex-shrink: 0;
}

.login-notice-card .notice-text {
    font-size: 0.82rem;
    color: #1e3a8a;
    line-height: 1.5;
}

.login-notice-card .notice-text strong {
    color: #2563eb;
    font-weight: 800;
}

.login-notice-card .notice-text p {
    margin-top: 2px;
    font-size: 0.77rem;
    color: #64748b;
}

/* ---------------- 알림 메시지 ---------------- */
.alert-banner {
    padding: 1rem 1.25rem;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    font-size: 0.9rem;
    line-height: 1.5;
}

.alert-warning {
    background-color: #fffbeb;
    border: 1px solid #fde68a;
    color: #92400e;
}

.alert-info {
    background-color: #eff6ff;
    border: 1px solid #bfdbfe;
    color: #1e40af;
}

.alert-success {
    background-color: #f0fdf4;
    border: 1px solid #bbf7d0;
    color: #166534;
}

.alert-error {
    background-color: #fef2f2;
    border: 1px solid #fecaca;
    color: #991b1b;
}

/* ---------------- 학생 수료증 대시보드 ---------------- */
.student-view-layout {
    display: grid;
    grid-template-columns: 340px 1fr;
    gap: 2rem;
    align-items: start;
}

@media (max-width: 900px) {
    .student-view-layout {
        grid-template-columns: 1fr;
    }
}

.student-panel {
    background: #ffffff;
    border-radius: 16px;
    padding: 1.75rem;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
}

.student-info-header {
    border-bottom: 1px solid #f1f5f9;
    padding-bottom: 1.25rem;
    margin-bottom: 1.25rem;
}

.student-name-tag {
    font-size: 1.3rem;
    font-weight: 800;
    color: #0f172a;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.student-school-tag {
    font-size: 0.85rem;
    color: #6366f1;
    font-weight: 600;
    margin-top: 0.2rem;
}

/* 사진 업로드 컨트롤 */
.photo-uploader-box {
    background-color: #f8fafc;
    border: 2px dashed #cbd5e1;
    border-radius: 12px;
    padding: 1.25rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    margin-bottom: 1.5rem;
}

.photo-uploader-box:hover {
    border-color: var(--primary);
    background-color: #f1f5f9;
}

.photo-preview-thumb {
    width: 90px;
    height: 120px;
    object-fit: cover;
    border-radius: 6px;
    margin: 0 auto 0.75rem auto;
    border: 2px solid #e2e8f0;
    display: block;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}

/* 액션 버튼 그룹 (인쇄 & 다운로드) */
.action-buttons-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.btn-action {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.85rem 1rem;
    border-radius: 10px;
    font-weight: 700;
    font-size: 0.95rem;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
}

.btn-print {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.25);
}

.btn-print:hover {
    filter: brightness(1.1);
    transform: translateY(-1px);
}

.btn-download-img {
    background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.25);
}

.btn-download-img:hover {
    filter: brightness(1.1);
    transform: translateY(-1px);
}

.btn-download-pdf {
    background: #ffffff;
    color: #334155;
    border: 1.5px solid #cbd5e1;
}

.btn-download-pdf:hover {
    background: #f8fafc;
    border-color: #94a3b8;
}

/* ---------------- 수료증 본체 스타일 (실물 및 인쇄) ---------------- */
.certificate-preview-container {
    background: #e2e8f0;
    border-radius: 16px;
    padding: 2rem 1rem;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow-x: auto;
    box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.06);
}

.certificate-sheet {
    width: var(--cert-width);
    height: var(--cert-height);
    background-color: #ffffff;
    padding: 28px;
    position: relative;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    font-family: 'Noto Sans KR', sans-serif;
    color: #000000;
    flex-shrink: 0;
    overflow: hidden;
}

/* 은은하지만 확실하게 돋보이는 로보그램 코딩캠프 워터마크 배경 */
.cert-background-watermark {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url('../assets/cert_bg.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    opacity: 0.75;
    z-index: 1;
    pointer-events: none;
}

/* 골드 더블 프레임 */
.cert-border-outer {
    position: absolute;
    top: 20px;
    left: 20px;
    right: 20px;
    bottom: 20px;
    border: 10px solid var(--gold);
    pointer-events: none;
    z-index: 2;
}

.cert-border-inner {
    position: absolute;
    top: 32px;
    left: 32px;
    right: 32px;
    bottom: 32px;
    border: 3px solid var(--gold);
    pointer-events: none;
}

.cert-content {
    position: relative;
    z-index: 10;
    height: 100%;
    display: flex;
    flex-direction: column;
    padding: 35px 45px 30px 45px;
}

/* 상단 제목 */
.cert-header {
    text-align: center;
    margin-top: 15px;
    margin-bottom: 25px;
}

.cert-title {
    font-size: 56px;
    font-weight: 900;
    letter-spacing: 0.35em;
    color: #000000;
    line-height: 1.1;
    margin-left: 0.35em; /* 자간 중앙 정렬 보정 */
}

.cert-subtitle {
    font-size: 26px;
    color: #6b7280;
    font-family: 'Playfair Display', Georgia, serif;
    font-weight: 600;
    margin-top: 14px;
    letter-spacing: 0.05em;
}

/* 중간 영역: 정보 목록 & 사진 */
.cert-middle {
    position: relative;
    margin-top: 20px;
    margin-bottom: 30px;
    min-height: 250px;
}

.cert-info-list {
    list-style: none;
    font-size: 21.5px;
    line-height: 2.15;
    color: #000000;
    font-weight: 500;
    padding-left: 10px;
    max-width: 530px;
}

.cert-info-list li {
    display: flex;
    align-items: baseline;
}

.cert-info-list .info-label {
    width: 125px;
    flex-shrink: 0;
    font-weight: 500;
    letter-spacing: -0.02em;
}

.cert-info-list .info-val {
    font-weight: 700;
    color: #000000;
    word-break: keep-all;
}

.cert-info-list .info-date {
    white-space: nowrap !important;
}

/* 학생 사진 프레임 (3:4 규격 컴팩트 배치) */
.cert-photo-container {
    position: absolute;
    top: 15px;
    right: 30px;
    width: 140px;
    height: 185px;
    background: #f8fafc;
    border: 1px solid #cbd5e1;
    border-radius: 6px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.cert-photo-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.cert-photo-empty {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: #94a3b8;
    font-size: 0.85rem;
    background-color: #f1f5f9;
}

/* 수료 증명 문구 */
.cert-statement {
    text-align: center;
    font-size: 25px;
    line-height: 1.7;
    font-weight: 600;
    color: #000000;
    margin: 30px 0 35px 0;
    letter-spacing: -0.01em;
}

/* 발급 일자 */
.cert-date {
    text-align: center;
    font-size: 24px;
    font-weight: 500;
    color: #000000;
    margin-bottom: 40px;
}

/* 하단 발급기관 & 직인 */
.cert-footer {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 25px;
}

.cert-issuer-wrap {
    display: inline-block;
    position: relative;
}

.cert-issuer-text {
    font-size: 52px;
    font-weight: 900;
    color: #4f46e5;
    letter-spacing: 0.12em;
    position: relative;
    z-index: 5;
    line-height: 1;
}

.cert-last-char {
    display: inline-block;
    position: relative;
    letter-spacing: 0 !important;
    margin-right: 0.12em;
}

.cert-seal-img {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 165px;
    height: 165px;
    object-fit: contain;
    z-index: 10;
    opacity: 0.95;
    mix-blend-mode: multiply;
    pointer-events: none;
}

/* ---------------- 관리자 대시보드 ---------------- */
.admin-header-tabs {
    display: flex;
    gap: 0.75rem;
    border-bottom: 2px solid #e2e8f0;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
}

.admin-tab-btn {
    padding: 0.65rem 1.25rem;
    font-size: 0.95rem;
    font-weight: 700;
    color: #64748b;
    border: none;
    background: none;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.2s;
}

.admin-tab-btn.active {
    color: var(--primary);
    background-color: var(--primary-light);
}

.data-table-wrap {
    overflow-x: auto;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    background: #ffffff;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.88rem;
    text-align: left;
}

.data-table th {
    background-color: #f8fafc;
    padding: 0.85rem 1rem;
    font-weight: 700;
    color: #475569;
    border-bottom: 1px solid var(--border-color);
    white-space: nowrap;
}

.data-table td {
    padding: 0.85rem 1rem;
    border-bottom: 1px solid var(--border-color);
    color: #1e293b;
    vertical-align: middle;
}

.data-table tr:hover {
    background-color: #f1f5f9;
}

.badge {
    display: inline-block;
    padding: 0.2rem 0.55rem;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 700;
}

.badge-success { background: #dcfce7; color: #15803d; }
.badge-warning { background: #fef3c7; color: #b45309; }
.badge-gray { background: #f1f5f9; color: #64748b; }

/* ---------------- 모달 팝업 ---------------- */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    padding: 1rem;
}

.modal-card {
    background: #ffffff;
    border-radius: 16px;
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    padding: 2rem;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
}

.modal-title {
    font-size: 1.25rem;
    font-weight: 800;
    color: #0f172a;
}

.btn-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: #94a3b8;
    cursor: pointer;
}

/* ==============================================================
   ★ A4 인쇄 전용 CSS (노트북/PC 완벽 출력 지원) ★
   ============================================================== */
@media print {
    @page {
        size: A4 portrait;
        margin: 0;
    }

    body {
        background: #ffffff !important;
        margin: 0 !important;
        padding: 0 !important;
        -webkit-print-color-adjust: exact !important;
        print-color-adjust: exact !important;
    }

    /* 인쇄 시 불필요한 모든 UI 요소 숨김 */
    .app-header,
    .student-panel,
    .alert-banner,
    .login-card,
    .admin-wrapper,
    .action-buttons-group,
    .no-print {
        display: none !important;
    }

    .main-wrapper {
        padding: 0 !important;
        margin: 0 !important;
        max-width: 100% !important;
    }

    .student-view-layout {
        display: block !important;
        margin: 0 !important;
        padding: 0 !important;
    }

    .certificate-preview-container {
        background: transparent !important;
        padding: 0 !important;
        margin: 0 !important;
        box-shadow: none !important;
        border-radius: 0 !important;
        display: block !important;
    }

    /* A4 정밀 규격: 210mm x 297mm 꽉 차게 한 페이지에 출력 */
    .certificate-sheet {
        width: 210mm !important;
        height: 297mm !important;
        max-width: 210mm !important;
        max-height: 297mm !important;
        box-shadow: none !important;
        border: none !important;
        margin: 0 auto !important;
        padding: 10mm !important;
        page-break-after: avoid !important;
        page-break-inside: avoid !important;
        -webkit-print-color-adjust: exact !important;
        print-color-adjust: exact !important;
        overflow: hidden !important;
    }

    .cert-background-watermark {
        position: absolute !important;
        top: 0 !important;
        left: 0 !important;
        right: 0 !important;
        bottom: 0 !important;
        background-image: url('../assets/cert_bg.jpg') !important;
        background-size: cover !important;
        background-position: center !important;
        opacity: 0.65 !important;
        z-index: 1 !important;
        -webkit-print-color-adjust: exact !important;
        print-color-adjust: exact !important;
    }

    .cert-border-outer {
        top: 7mm !important;
        left: 7mm !important;
        right: 7mm !important;
        bottom: 7mm !important;
        border-width: 3.5mm !important;
        -webkit-print-color-adjust: exact !important;
        print-color-adjust: exact !important;
    }

    .cert-border-inner {
        top: 11.5mm !important;
        left: 11.5mm !important;
        right: 11.5mm !important;
        bottom: 11.5mm !important;
        border-width: 1mm !important;
        -webkit-print-color-adjust: exact !important;
        print-color-adjust: exact !important;
    }

    .cert-content {
        padding: 12mm 15mm 10mm 15mm !important;
    }

    .cert-title {
        font-size: 21mm !important;
    }

    .cert-subtitle {
        font-size: 9mm !important;
    }

    .cert-middle {
        min-height: 52mm !important;
        margin-top: 5mm !important;
        margin-bottom: 7mm !important;
    }

    .cert-info-list {
        font-size: 5.6mm !important;
        line-height: 2.15 !important;
        padding-left: 2mm !important;
        max-width: 138mm !important;
    }

    .cert-info-list .info-label {
        width: 32mm !important;
        flex-shrink: 0 !important;
    }

    .cert-info-list .info-val {
        word-break: keep-all !important;
    }

    .cert-info-list .info-date {
        white-space: nowrap !important;
    }

    .cert-photo-container {
        width: 33mm !important;
        height: 44mm !important;
        right: 6mm !important;
        top: 2mm !important;
        border-radius: 1.5mm !important;
    }

    .cert-statement {
        font-size: 8mm !important;
    }

    .cert-date {
        font-size: 7.5mm !important;
    }

    .cert-issuer-wrap {
        display: inline-block !important;
        position: relative !important;
    }

    .cert-issuer-text {
        font-size: 18mm !important;
        line-height: 1 !important;
    }

    .cert-last-char {
        display: inline-block !important;
        position: relative !important;
    }

    .cert-seal-img {
        width: 48mm !important;
        height: 48mm !important;
        left: 50% !important;
        top: 50% !important;
        transform: translate(-50%, -50%) !important;
        right: auto !important;
        mix-blend-mode: multiply !important;
    }
}

/* ---------------- 시작화면 하단 시크릿 관리자 배너 (롱프레스) ---------------- */
.secret-admin-footer {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin: 1.5rem auto 3rem auto;
    text-align: center;
}

.secret-admin-banner {
    position: relative;
    display: inline-flex;
    align-items: center;
    background: #ffffff;
    border: 1px solid #e2e8f0;
    box-shadow: 0 4px 14px rgba(15, 23, 42, 0.04);
    border-radius: 9999px;
    padding: 0.6rem 1.4rem;
    cursor: pointer;
    overflow: hidden;
    user-select: none;
    -webkit-user-select: none;
    -webkit-touch-callout: none;
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.secret-admin-banner:hover {
    border-color: #cbd5e1;
    box-shadow: 0 6px 18px rgba(15, 23, 42, 0.07);
}

.secret-admin-banner.holding {
    transform: scale(0.97);
    border-color: #93c5fd;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.18);
}

.secret-banner-inner {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    font-size: 0.82rem;
    color: #64748b;
    pointer-events: none;
}

.secret-badge-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: #3b82f6;
    display: inline-block;
    box-shadow: 0 0 6px rgba(59, 130, 246, 0.6);
}

.secret-brand-text {
    font-weight: 800;
    letter-spacing: 0.05em;
    color: #1e293b;
    font-size: 0.85rem;
}

.secret-divider {
    color: #cbd5e1;
    font-weight: 300;
}

.secret-subtext {
    font-size: 0.76rem;
    color: #94a3b8;
}

/* 3초간 차오르는 프로그레스 바 */
.secret-hold-progress {
    position: absolute;
    bottom: 0;
    left: 0;
    height: 3px;
    width: 0%;
    background: linear-gradient(90deg, #3b82f6, #4f46e5);
    border-radius: 0 2px 2px 0;
    pointer-events: none;
}

.secret-hold-hint {
    margin-top: 0.6rem;
    font-size: 0.78rem;
    color: #3b82f6;
    font-weight: 600;
    opacity: 0;
    transform: translateY(-4px);
    transition: opacity 0.25s ease, transform 0.25s ease;
    pointer-events: none;
}

.secret-hold-hint.active {
    opacity: 1;
    transform: translateY(0);
}

@media print {
    /* 인쇄 시 시크릿 관리자 배너 숨김 */
    .secret-admin-footer,
    #adminAuthModal {
        display: none !important;
    }
}