@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+KR:wght@400;700&display=swap');
/* PDF Image Tool - Optimized Styles */
:root {
    --primary-color: #0d6efd;
    --success-color: #198754;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #0dcaf0;
    --light-bg: #f8f9fa;
    --border-radius: 0.5rem;
    --box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    --transition: all 0.15s ease-in-out;
}

/* Base styles with font-display optimization */
body {
    font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-display: swap;
    background-color: #fff;
    color: #23272c;            /* ← 텍스트 색상 추가 */
    min-height: 100vh;
    margin: 0;
    padding: 0;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Headings (전체 헤딩에 색상 통일) */
h1, h2, h3, h4, h5, h6 {
    color: #23272c;
    font-weight: 700;
}

/* Optimized Upload Area */
.upload-area {
    border: 2px dashed #dee2e6;
    border-radius: var(--border-radius);
    background-color: #fff;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    will-change: transform, border-color, background-color;
}

.upload-area:hover {
    border-color: var(--primary-color);
    background-color: rgba(13, 110, 253, 0.05);
    transform: translateY(-1px);
}

.upload-area.dragover {
    border-color: var(--primary-color);
    background-color: rgba(13, 110, 253, 0.1);
    transform: scale(1.01);
}

/* Toggle Styles */
.guide-hidden {
    display: none !important;
}

.section-hidden {
    display: none !important;
}

/* Card Toggle Animation */
.upload-card-body [onclick], 
.options-card-body [onclick],
#guideSection [onclick] {
    transition: background-color 0.2s ease;
}

.upload-card-body [onclick]:hover {
    background-color: rgba(0, 0, 0, 0.05);
    border-radius: 8px;
    padding: 8px;
    margin: -8px;
}

.options-card-body [onclick]:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    padding: 8px;
    margin: -8px;
}

#guideSection [onclick]:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    padding: 8px;
    margin: -8px;
}

/* Accessibility Classes */
.visually-hidden {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}

/* Cookie Settings Toggle Switches */
input[type="checkbox"]:checked + span {
    background-color: #2E5D4B !important;
}

input[type="checkbox"]:checked + span + span {
    transform: translateX(26px) !important;
}

/* Mobile-first upload area */
@media (max-width: 768px) {
    .upload-area {
        min-height: 150px;
        padding: 1rem;
    }
}

@media (max-width: 576px) {
    .upload-area {
        min-height: 120px;
        padding: 0.75rem;
    }
}

.upload-area i[data-feather="upload-cloud"] {
    color: #6c757d;
    transition: color 0.3s ease;
}

.upload-area:hover i[data-feather="upload-cloud"] {
    color: var(--primary-color);
}

/* File Info Styles */
.file-info {
    background-color: #e7f3ff;
    border: 1px solid #b6d7ff;
    border-radius: var(--border-radius);
    padding: 1rem;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Card Enhancements */
.card {
    border: none;
    border-radius: var(--border-radius);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
}

.card-title {
    color: #23272c;   /* ← 카드 타이틀 색상 통일 */
    font-weight: 700;
}

/* Button Enhancements */
.btn {
    border-radius: var(--border-radius);
    font-weight: 500;
    transition: all 0.2s ease;
    position: relative;
    overflow: hidden;
}

.btn:before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.btn:hover:before {
    left: 100%;
}

.btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: 1.1rem;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Progress Bar Enhancements */
.progress {
    border-radius: var(--border-radius);
    background-color: #e9ecef;
    overflow: hidden;
}

.progress-bar {
    border-radius: var(--border-radius);
    font-size: 0.875rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: width 0.3s ease;
}

/* Alert Styles */
.alert {
    border-radius: var(--border-radius);
    border: none;
    margin-bottom: 1rem;
    animation: slideDown 0.3s ease;
}

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

.alert-success {
    background-color: #d1edff;
    color: #0c5460;
}

.alert-danger {
    background-color: #f8d7da;
    color: #721c24;
}

.alert-warning {
    background-color: #fff3cd;
    color: #856404;
}

.alert-info {
    background-color: #d1ecf1;
    color: #0c5460;
}

/* Download Area */
.download-item {
    background-color: #fff;
    border: 1px solid #dee2e6;
    border-radius: var(--border-radius);
    padding: 1rem;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: all 0.2s ease;
}

.download-item:hover {
    background-color: var(--light-bg);
    border-color: var(--primary-color);
}

.download-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.download-meta {
    font-size: 0.875rem;
    color: #6c757d;
}

/* Loading States */
.loading {
    position: relative;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid #f3f3f3;
    border-top: 2px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    
    .display-4 {
        font-size: 2rem;
    }
    
    .btn-lg {
        padding: 0.5rem 1rem;
        font-size: 1rem;
    }
    
    .card-body {
        padding: 1rem;
    }
}

@media (max-width: 576px) {
    .col-md-6 {
        margin-bottom: 1rem;
    }
    
    .upload-area {
        padding: 1rem;
    }
    
    .upload-area i[data-feather="upload-cloud"] {
        width: 32px;
        height: 32px;
    }
}

/* Utility Classes */
.text-truncate-2 {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.cursor-pointer {
    cursor: pointer;
}

.border-dashed {
    border-style: dashed !important;
}

/* New Design Components */
.feature-item {
    padding: 1rem;
}

.feature-emoji {
    font-size: 2rem;
    display: block;
    margin-bottom: 0.5rem;
}

.upload-card {
    background: #f8f9fa;
    border-radius: 15px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    margin-bottom: 2rem;
}

.upload-card-body {
    padding: 2rem;
}

.upload-area-new {
    border: 2px dashed #dee2e6;
    border-radius: 10px;
    background-color: #fff;
    cursor: pointer;
    transition: all 0.3s ease;
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.upload-area-new:hover {
    border-color: #0d6efd;
    background-color: rgba(13, 110, 253, 0.05);
    transform: translateY(-2px);
}

.upload-area-new.dragover {
    border-color: #0d6efd;
    background-color: rgba(13, 110, 253, 0.1);
    transform: scale(1.02);
}

.upload-icon {
    color: #6c757d;
    transition: color 0.3s ease;
}

.upload-area-new:hover .upload-icon {
    color: #0d6efd;
}

.upload-text {
    color: #6c757d;
    font-size: 1rem;
}

.file-info-new {
    background-color: #e7f3ff;
    border: 1px solid #b6d7ff;
    border-radius: 10px;
    padding: 1.5rem;
    animation: fadeIn 0.3s ease;
}

.options-card, .progress-card, .results-card {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 15px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.options-card-body, .progress-card-body, .results-card-body {
    padding: 2rem;
}

.btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: 1.1rem;
    border-radius: 10px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-lg:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* Validation States */
.upload-area-new.error {
    border-color: #dc3545;
    background-color: rgba(220, 53, 69, 0.1);
}

.upload-area-new.success {
    border-color: #198754;
    background-color: rgba(25, 135, 84, 0.1);
}

/* Alert Enhancements */
.alert {
    border-radius: 10px;
    border: none;
    margin-bottom: 1rem;
    animation: slideDown 0.3s ease;
    backdrop-filter: blur(10px);
}

.alert-success {
    background-color: rgba(25, 135, 84, 0.9);
    color: white;
}

.alert-danger {
    background-color: rgba(220, 53, 69, 0.9);
    color: white;
}

.alert-warning {
    background-color: rgba(255, 193, 7, 0.9);
    color: #212529;
}

.alert-info {
    background-color: rgba(13, 110, 253, 0.9);
    color: white;
}

/* Developer & Support Buttons */
.developer-btn, .support-btn {
    transition: all 0.3s ease;
    border-radius: 25px;
    font-size: 0.875rem;
    padding: 0.75rem 1.5rem;
    border: 2px solid #fff !important;
    color: #fff !important;
    background-color: transparent;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    font-weight: 500;
}

.developer-btn:hover, .support-btn:hover {
    background-color: rgba(255, 255, 255, 0.15);
    border-color: #fff !important;
    color: #fff !important;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    text-decoration: none;
}

.developer-btn:focus, .support-btn:focus {
    outline: 2px solid #fff;
    outline-offset: 2px;
}

.support-btn {
    border-color: #ff6b6b !important;
    color: #ff6b6b !important;
}

.support-btn:hover {
    background-color: rgba(255, 107, 107, 0.15);
    border-color: #ff6b6b !important;
    color: #ff6b6b !important;
}

/* Mobile buttons */
@media (max-width: 768px) {
    .developer-btn, .support-btn {
        padding: 0.65rem 1.3rem;
        font-size: 0.85rem;
        margin-bottom: 0.5rem;
    }
}

@media (max-width: 576px) {
    .developer-btn, .support-btn {
        padding: 0.6rem 1.2rem;
        font-size: 0.8rem;
        border-radius: 20px;
        width: 100%;
        max-width: 200px;
    }
    
    .d-flex.gap-3 {
        flex-direction: column;
        align-items: center;
        gap: 0.75rem !important;
    }
}

/* Usage Instructions Visibility */
#usageInstructions {
    display: block !important;
    opacity: 1 !important;
    visibility: visible !important;
}

#usageInstructions.show {
    display: block !important;
}

#usageInstructions .row {
    opacity: 1 !important;
    visibility: visible !important;
}

.bg-white.bg-opacity-10 {
    background-color: rgba(255, 255, 255, 0.1) !important;
}

.bg-white.bg-opacity-5 {
    background-color: rgba(255, 255, 255, 0.05) !important;
}

/* GDPR Consent Banner */
#consent-banner {
    animation: slideUp 0.4s ease-out;
}

@keyframes slideUp {
    from {
        transform: translateY(100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

#consent-banner button:hover {
    transform: translateY(-1px);
}

#consent-banner button:first-child:hover {
    background-color: #f8f9fa;
    border-color: #6c757d;
}

#consent-banner button:last-child:hover {
    background-color: #1e4a37;
}

/* Mobile consent banner */
@media (max-width: 768px) {
    #consent-banner {
        bottom: 10px !important;
        left: 10px !important;
        right: 10px !important;
        padding: 16px !important;
        max-width: none !important;
    }
    
    #consent-banner h6 {
        font-size: 15px !important;
    }
    
    #consent-banner p {
        font-size: 13px !important;
    }
    
    #consent-banner div:last-child {
        flex-direction: column !important;
        gap: 8px !important;
    }
    
    #consent-banner button {
        width: 100% !important;
        padding: 10px 16px !important;
        font-size: 14px !important;
    }
}

/* Legal Links */
.legal-link {
    font-size: 0.875rem;
    transition: color 0.3s ease;
}

.legal-link:hover {
    color: #fff !important;
}

/* ===== PAGESPEED & MOBILE OPTIMIZATIONS ===== */

/* Performance Optimizations */
* {
    box-sizing: border-box;
}

/* GPU Acceleration for Animations */
.btn, .upload-area, .progress-bar, .alert {
    transform: translateZ(0);
    backface-visibility: hidden;
    perspective: 1000px;
}

/* Enhanced Button Styles for Mobile */
.btn {
    transition: var(--transition);
    border-radius: var(--border-radius);
    font-weight: 500;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    will-change: transform, box-shadow;
    min-height: 44px; /* Touch target size */
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

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

.btn:disabled {
    transform: none;
    box-shadow: none;
}

/* Feature Item Mobile Optimization */
.feature-emoji {
    font-size: 3rem;
    display: block;
    margin-bottom: 1rem;
    line-height: 1;
}

/* Responsive Typography */
.display-4 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
}

.lead {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
}

/* Mobile-First Responsive Design */
@media (max-width: 1200px) {
    .container {
        max-width: 100%;
        padding: 0 20px;
    }
}

@media (max-width: 992px) {
    .col-lg-8 {
        max-width: 100%;
        flex: 0 0 100%;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    
    .col-md-4, .col-md-3 {
        max-width: 100%;
        flex: 0 0 100%;
        margin-bottom: 1rem;
    }
    
    .p-4 {
        padding: 1.5rem !important;
    }
    
    .mb-5 {
        margin-bottom: 2rem !important;
    }
    
    .feature-emoji {
        font-size: 2.5rem;
        margin-bottom: 0.75rem;
    }
    
    .btn {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }
    
    .btn-lg {
        padding: 0.75rem 1.25rem;
        font-size: 1rem;
        min-height: 48px;
    }
    
    .upload-area {
        min-height: 150px;
        padding: 1rem;
    }
    
    .progress-card-body {
        padding: 1.5rem;
    }
    
    .progress {
        height: 8px;
    }
}

@media (max-width: 576px) {
    .container {
        padding: 0 10px;
    }
    
    .p-4 {
        padding: 1rem !important;
    }
    
    .mb-5 {
        margin-bottom: 1.5rem !important;
    }
    
    .feature-emoji {
        font-size: 2rem;
        margin-bottom: 0.5rem;
    }
    
    .btn {
        padding: 0.625rem 1.125rem;
        font-size: 0.875rem;
        width: 100%;
        margin-bottom: 0.5rem;
    }
    
    .btn-lg {
        padding: 0.75rem 1.25rem;
        font-size: 0.9rem;
    }
    
    .upload-area {
        min-height: 120px;
        padding: 0.75rem;
    }
    
    .progress-card-body {
        padding: 1rem;
    }
    
    .progress {
        height: 6px;
    }
    
    .alert {
        padding: 0.75rem;
        font-size: 0.875rem;
        border-left-width: 3px;
    }
    
    /* Stack conversion buttons vertically on mobile */
    .row .col-md-3 {
        margin-bottom: 0.75rem;
    }
    
    /* Improve touch targets */
    .btn-close {
        padding: 0.75rem;
        margin: -0.75rem;
    }
}

/* Extra Small Devices */
@media (max-width: 400px) {
    .container {
        padding: 0 8px;
    }
    
    .p-4 {
        padding: 0.75rem !important;
    }
    
    .feature-emoji {
        font-size: 1.75rem;
    }
    
    .btn {
        font-size: 0.8rem;
        padding: 0.5rem 1rem;
    }
    
    .upload-area {
        min-height: 100px;
        padding: 0.5rem;
    }
}

/* Accessibility Improvements */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    .upload-area {
        border-width: 3px;
    }
    
    .btn {
        border-width: 2px;
    }
}

/* Print Styles */
@media print {
    .upload-area, .btn, .progress-card {
        display: none !important;
    }
    
    body {
        background: white !important;
        color: black !important;
    }
}

/* 추가 버튼 컬러 커스텀 */
.btn-teal {
  background-color: #20c997;
  color: #fff;
  border-color: #20c997;
}
.btn-teal:hover, .btn-teal:focus {
  background-color: #17a589;
  color: #fff;
  border-color: #17a589;
}

.btn-purple {
  background-color: #7c3aed;
  color: #fff;
  border-color: #7c3aed;
}
.btn-purple:hover, .btn-purple:focus {
  background-color: #5b21b6;
  color: #fff;
  border-color: #5b21b6;
}