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

:root {
    --bg-gradient: linear-gradient(135deg, #0f172a 0%, #1e1b4b 50%, #311042 100%);
    --card-bg: rgba(30, 41, 59, 0.75);
    --card-border: rgba(255, 255, 255, 0.12);
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --primary-glow: rgba(99, 102, 241, 0.35);
    --accent: #ec4899;
    --accent-glow: rgba(236, 72, 153, 0.3);
    --success: #10b981;
    --warning: #f59e0b;
    --text-main: #f8fafc;
    --text-heading: #ffffff;
    --text-muted: #94a3b8;
    --text-dark: #1e293b;
    --form-group-bg: rgba(15, 23, 42, 0.35);
    --form-group-border: rgba(255, 255, 255, 0.05);
    --form-group-hover-bg: rgba(15, 23, 42, 0.5);
    --input-bg: rgba(15, 23, 42, 0.6);
    --input-border: rgba(255, 255, 255, 0.15);
    --radius-lg: 18px;
    --radius-md: 12px;
    --radius-sm: 8px;
    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow: 0 10px 30px -5px rgba(0, 0, 0, 0.5);
}

/* Light Theme Variables */
html.light {
    --bg-gradient: linear-gradient(135deg, #eef2ff 0%, #e0e7ff 50%, #f3e8ff 100%);
    --card-bg: rgba(255, 255, 255, 0.92);
    --card-border: rgba(99, 102, 241, 0.18);
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --primary-glow: rgba(79, 70, 229, 0.25);
    --accent: #db2777;
    --accent-glow: rgba(219, 39, 119, 0.2);
    --text-main: #1e293b;
    --text-heading: #0f172a;
    --text-muted: #64748b;
    --form-group-bg: rgba(241, 245, 249, 0.75);
    --form-group-border: rgba(203, 213, 225, 0.6);
    --form-group-hover-bg: rgba(226, 232, 240, 0.85);
    --input-bg: #ffffff;
    --input-border: rgba(203, 213, 225, 0.9);
    --shadow: 0 10px 30px -5px rgba(99, 102, 241, 0.12);
}

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

body {
    font-family: 'Noto Sans KR', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-gradient);
    background-attachment: fixed;
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding: 2rem 1rem;
    line-height: 1.6;
}

/* Container */
.container {
    width: 100%;
    max-width: 820px;
    margin: 0 auto;
}

.admin-container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
}

/* Glass Header / Card */
.survey-card, .admin-card {
    background: var(--card-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    padding: 2.5rem;
    margin-bottom: 2rem;
    position: relative;
    overflow: hidden;
}

.survey-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
}

.survey-header {
    text-align: center;
    margin-bottom: 2.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--card-border);
}

.survey-header h1 {
    font-size: 2.1rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    margin-bottom: 0.8rem;
    color: var(--text-heading);
}

html.dark .survey-header h1 {
    background: linear-gradient(135deg, #ffffff 0%, #cbd5e1 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

html.light .survey-header h1 {
    background: linear-gradient(135deg, #0f172a 0%, #4338ca 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.survey-header p {
    color: var(--text-muted);
    font-size: 1.05rem;
    max-width: 640px;
    margin: 0 auto;
}

/* Theme Toggle Button */
.theme-toggle-btn {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    color: var(--text-main);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    z-index: 10;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.theme-toggle-btn:hover {
    transform: scale(1.1) rotate(15deg);
    border-color: var(--primary);
    box-shadow: 0 0 15px var(--primary-glow);
}

/* Form Questions */
.form-group {
    margin-bottom: 2.2rem;
    background: var(--form-group-bg);
    padding: 1.5rem 1.8rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--form-group-border);
    transition: var(--transition);
}

.form-group:focus-within, .form-group:hover {
    border-color: rgba(99, 102, 241, 0.4);
    background: var(--form-group-hover-bg);
    box-shadow: 0 4px 20px rgba(0,0,0,0.12);
}

.question-title {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 1.1rem;
    display: flex;
    align-items: flex-start;
    gap: 0.6rem;
}

.question-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
    font-size: 0.85rem;
    font-weight: 700;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    flex-shrink: 0;
    margin-top: 2px;
}

.question-subtext {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 400;
    margin-top: 0.25rem;
}

/* Checkbox & Radio Controls */
.options-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 0.8rem;
}

.option-item {
    position: relative;
}

.option-item input[type="radio"],
.option-item input[type="checkbox"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.option-label {
    display: flex;
    align-items: center;
    padding: 0.9rem 1.1rem;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    color: var(--text-main);
    font-size: 0.98rem;
    transition: var(--transition);
    user-select: none;
}

.option-label:hover {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.1);
    transform: translateY(-1px);
}

.option-item input:checked + .option-label {
    border-color: var(--primary);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.25) 0%, rgba(236, 72, 153, 0.15) 100%);
    box-shadow: 0 0 15px var(--primary-glow);
    color: #ffffff;
    font-weight: 500;
}

/* Custom Checkbox/Radio Icon */
.custom-check, .custom-radio {
    width: 18px;
    height: 18px;
    border: 2px solid var(--text-muted);
    margin-right: 0.8rem;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.custom-radio {
    border-radius: 50%;
}

.custom-check {
    border-radius: 4px;
}

.option-item input:checked + .option-label .custom-radio {
    border-color: var(--primary);
    background: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.3);
}

.option-item input:checked + .option-label .custom-radio::after {
    content: '';
    width: 6px;
    height: 6px;
    background: white;
    border-radius: 50%;
}

.option-item input:checked + .option-label .custom-check {
    border-color: var(--primary);
    background: var(--primary);
}

.option-item input:checked + .option-label .custom-check::after {
    content: '✓';
    color: white;
    font-size: 12px;
    font-weight: bold;
}

/* Etc Text Inputs */
.etc-input {
    margin-top: 0.6rem;
    width: 100%;
    padding: 0.8rem 1rem;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: var(--radius-sm);
    color: var(--text-main);
    font-size: 0.95rem;
    outline: none;
    transition: var(--transition);
}

.etc-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 10px var(--primary-glow);
}

/* Textarea */
textarea.form-control {
    width: 100%;
    min-height: 110px;
    padding: 1rem;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: var(--radius-sm);
    color: var(--text-main);
    font-size: 0.98rem;
    font-family: inherit;
    resize: vertical;
    outline: none;
    transition: var(--transition);
}

textarea.form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 12px var(--primary-glow);
}

/* Q7 Rating Scale (0 to 10) */
.rating-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.rating-grid {
    display: grid;
    grid-template-columns: repeat(11, 1fr);
    gap: 0.4rem;
}

.rating-btn {
    appearance: none;
    -webkit-appearance: none;
    display: none;
}

.rating-label {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 48px;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: var(--radius-sm);
    color: var(--text-main);
    font-weight: 600;
    font-size: 1.05rem;
    cursor: pointer;
    transition: var(--transition);
}

.rating-label:hover {
    border-color: var(--accent);
    background: rgba(236, 72, 153, 0.15);
    transform: translateY(-2px);
}

.rating-btn:checked + .rating-label {
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    border-color: transparent;
    color: white;
    box-shadow: 0 0 15px var(--accent-glow);
    transform: scale(1.06);
}

.rating-legend {
    display: flex;
    justify-content: space-between;
    color: var(--text-muted);
    font-size: 0.88rem;
    padding: 0 0.3rem;
}

/* Submit Button */
.btn-submit {
    width: 100%;
    padding: 1.1rem;
    font-size: 1.15rem;
    font-weight: 700;
    color: white;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    box-shadow: 0 8px 25px var(--primary-glow);
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
}

.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 30px rgba(236, 72, 153, 0.45);
    filter: brightness(1.08);
}

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

/* Admin Dashboard Specific Styles */
.admin-navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--card-border);
}

.admin-title h2 {
    font-size: 1.8rem;
    font-weight: 700;
    background: linear-gradient(135deg, #ffffff, #94a3b8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.admin-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.btn-secondary {
    padding: 0.6rem 1.2rem;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--card-border);
    color: white;
    border-radius: var(--radius-sm);
    text-decoration: none;
    font-size: 0.92rem;
    font-weight: 500;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.18);
    border-color: rgba(255, 255, 255, 0.3);
}

.btn-danger {
    padding: 0.4rem 0.8rem;
    background: rgba(239, 68, 68, 0.2);
    border: 1px solid rgba(239, 68, 68, 0.4);
    color: #fca5a5;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.85rem;
    transition: var(--transition);
}

.btn-danger:hover {
    background: rgba(239, 68, 68, 0.4);
    color: white;
}

/* Stats Cards Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.2rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: rgba(15, 23, 42, 0.5);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-3px);
    border-color: var(--primary);
    box-shadow: 0 8px 25px rgba(0,0,0,0.3);
}

.stat-title {
    font-size: 0.88rem;
    color: var(--text-muted);
    font-weight: 500;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: white;
}

.stat-desc {
    font-size: 0.82rem;
    color: var(--success);
}

/* Charts Grid */
.charts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2.5rem;
}

.chart-box {
    background: rgba(15, 23, 42, 0.5);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
}

.chart-box h3 {
    font-size: 1.05rem;
    color: #e2e8f0;
    margin-bottom: 1rem;
    font-weight: 600;
}

.chart-container {
    position: relative;
    width: 100%;
    min-height: 240px;
}

/* Data Table */
.table-wrapper {
    overflow-x: auto;
    border-radius: var(--radius-md);
    border: 1px solid var(--card-border);
}

table.response-table {
    width: 100%;
    border-collapse: collapse;
    background: rgba(15, 23, 42, 0.5);
    text-align: left;
    font-size: 0.92rem;
}

table.response-table th {
    background: rgba(30, 41, 59, 0.9);
    padding: 1rem;
    color: #cbd5e1;
    font-weight: 600;
    border-bottom: 1px solid var(--card-border);
    white-space: nowrap;
}

table.response-table td {
    padding: 0.9rem 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--text-main);
    vertical-align: middle;
}

table.response-table tr:hover {
    background: rgba(99, 102, 241, 0.08);
}

.badge-score {
    display: inline-block;
    padding: 0.25rem 0.6rem;
    border-radius: 20px;
    font-weight: 700;
    font-size: 0.85rem;
}

.score-high {
    background: rgba(16, 185, 129, 0.2);
    color: #34d399;
    border: 1px solid rgba(16, 185, 129, 0.4);
}

.score-mid {
    background: rgba(245, 158, 11, 0.2);
    color: #fbbf24;
    border: 1px solid rgba(245, 158, 11, 0.4);
}

.score-low {
    background: rgba(239, 68, 68, 0.2);
    color: #f87171;
    border: 1px solid rgba(239, 68, 68, 0.4);
}

/* Toast & Alert */
.alert {
    padding: 1rem 1.2rem;
    border-radius: var(--radius-sm);
    margin-bottom: 1.5rem;
    font-weight: 500;
}

.alert-success {
    background: rgba(16, 185, 129, 0.2);
    border: 1px solid rgba(16, 185, 129, 0.4);
    color: #a7f3d0;
}

.alert-danger {
    background: rgba(239, 68, 68, 0.2);
    border: 1px solid rgba(239, 68, 68, 0.4);
    color: #fecaca;
}

/* Footer */
footer {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.88rem;
    margin-top: auto;
    padding-top: 1rem;
}

/* Responsive */
@media (max-width: 640px) {
    .survey-card, .admin-card {
        padding: 1.5rem 1.2rem;
    }
    
    .rating-grid {
        grid-template-columns: repeat(6, 1fr);
    }
    
    .options-grid {
        grid-template-columns: 1fr;
    }
}