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

:root {
    /* Background Colors */
    --bg-gradient-start: #f8f9fa;
    --bg-gradient-end: #e9ecef;
    --card-bg: #ffffff;
    --overlay-bg: rgba(0, 0, 0, 0.9);
    --upload-hover-bg: #f0f7ff;
    
    /* Text Colors */
    --text-primary: #000000;
    --text-secondary: #6c757d;
    --text-white: #ffffff;
    
    /* Brand Colors */
    --primary-color: #2eac34;
    --primary-hover: #258a2a;
    --border-color: #c9ae8c;
    
    /* Status Colors */
    --success-color: #2eac34;
    --danger-color: #dc3545;
    --warning-color: #c9ae8c;
    
    /* Component-specific Colors */
    --audio-gradient-start: #c9ae8c;
    --audio-gradient-end: #b3987a;
    --image-badge-bg: #e8f5e9;
    --audio-badge-bg: #f5f0ea;
    --pdf-badge-bg: #fee;
    --error-bg: #fee;
    --error-border: #fcc;
    --modal-button-bg: rgba(255, 255, 255, 0.1);
    --modal-button-border: rgba(255, 255, 255, 0.2);
    --modal-button-hover: rgba(255, 255, 255, 0.2);
    --footer-bg: rgba(248, 249, 250, 0.8);
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(46, 172, 52, 0.1);
    --shadow-md: 0 4px 12px rgba(46, 172, 52, 0.15);
    --shadow-lg: 0 8px 24px rgba(46, 172, 52, 0.2);
    --shadow-modal: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-audio: 0 2px 8px rgba(0, 0, 0, 0.2);
}

/* ============================================
   1. GLOBAL STYLES
   ============================================ */

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
    color: var(--text-primary);
    min-height: 100vh;
    padding: 2rem 1rem 8rem 1rem;
    line-height: 1.6;
}

h1 {
    font-size: 2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

input[type="file"] {
    display: none;
}

/* ============================================
   2. LAYOUT COMPONENTS
   ============================================ */

.container {
    max-width: 1200px;
    margin: 0 auto;
}

.header {
    text-align: center;
    margin-bottom: 3rem;
}

.logo-img {
    width: 128px;
    height: 128px;
    vertical-align: middle;
    margin-right: 8px;
}

.header-actions {
    position: fixed;
    top: 1.5rem;
    right: 1.5rem;
    display: flex;
    gap: 0.75rem;
    z-index: 100;
}

/* ============================================
   3. BUTTONS & INTERACTIVE ELEMENTS
   ============================================ */

.reset-button,
.github-corner {
    background: var(--card-bg);
    color: var(--text-primary);
    padding: 0.625rem 1rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
}

.reset-button:hover,
.github-corner:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
    border-color: var(--primary-color);
}

.btn {
    flex: 1;
    padding: 0.75rem 1rem;
    border: none;
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    text-decoration: none;
}

.btn-primary {
    background: var(--primary-color);
    color: var(--text-white);
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--bg-gradient-start);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--card-bg);
    border-color: var(--primary-color);
}

/* ============================================
   4. UPLOAD SECTION
   ============================================ */

.upload-section {
    background: var(--card-bg);
    padding: 2.5rem;
    border-radius: 16px;
    box-shadow: var(--shadow-md);
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
}

.custom-file-upload {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem 2rem;
    background: var(--bg-gradient-start);
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
}

.custom-file-upload:hover {
    border-color: var(--primary-color);
    background: var(--upload-hover-bg);
}

.upload-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.upload-text {
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.upload-hint {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 400;
}

/* ============================================
   5. RESULTS SECTION
   ============================================ */

#results {
    margin-top: 2rem;
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
    gap: 1rem;
    flex-wrap: wrap;
}

.results-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.results-count {
    background: var(--primary-color);
    color: var(--text-white);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 500;
    display: inline-block;
}

/* ============================================
   6. FILE GRID & CARDS
   ============================================ */

.files-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
}

.file-card {
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.file-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.file-info {
    padding: 1.25rem;
}

.file-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 1rem;
}

.file-number {
    background: var(--primary-color);
    color: var(--text-white);
    font-weight: 600;
    font-size: 0.875rem;
    padding: 0.25rem 0.625rem;
    border-radius: 6px;
}

.file-meta {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.file-size {
    font-weight: 500;
}

.source-file {
    font-size: 0.75rem;
    color: var(--text-secondary);
    background: var(--bg-gradient-start);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.inline-svg {
    vertical-align: middle;
}

.file-actions {
    display: flex;
    gap: 0.5rem;
}

/* ============================================
   7. FILE TYPE BADGES
   ============================================ */

.file-type-badge {
    padding: 0.25rem 0.75rem;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.file-type-badge.pdf {
    background: var(--pdf-badge-bg);
    color: var(--primary-color);
}

.file-type-badge.audio {
    background: var(--audio-badge-bg);
    color: var(--border-color);
}

.file-type-badge.image {
    background: var(--image-badge-bg);
    color: var(--primary-color);
}

/* ============================================
   8. FILE PREVIEWS
   ============================================ */

.file-preview {
    width: 100%;
    height: 200px;
    background: var(--bg-gradient-start);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    border-bottom: 1px solid var(--border-color);
}

.file-preview iframe {
    width: 100%;
    height: 100%;
    border: none;
    background: var(--card-bg);
}

.preview-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    padding: 1rem;
    text-align: center;
}

.preview-icon {
    font-size: 3rem;
    margin-bottom: 0.5rem;
}

/* Image Preview */
.image-preview {
    cursor: pointer;
    overflow: hidden;
}

.image-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.image-preview:hover img {
    transform: scale(1.05);
}

/* Audio Player */
.audio-player {
    width: 100%;
    padding: 1.5rem;
    background: linear-gradient(135deg, var(--audio-gradient-start) 0%, var(--audio-gradient-end) 100%);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 200px;
    border-bottom: 1px solid var(--border-color);
    position: relative;
}

.audio-player::before {
    content: "";
    width: 48px;
    height: 48px;
    margin-bottom: 1rem;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M9 18V5l12-2v13'/%3E%3Ccircle cx='6' cy='18' r='3'/%3E%3Ccircle cx='18' cy='16' r='3'/%3E%3C/svg%3E");
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
    animation: float 3s ease-in-out infinite;
}

.audio-player audio {
    width: 100%;
    max-width: 100%;
    height: 40px;
    outline: none;
    filter: drop-shadow(var(--shadow-audio));
}

/* ============================================
   9. IMAGE MODAL
   ============================================ */

.image-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--overlay-bg);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    max-width: 90vw;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    z-index: 1001;
}

.modal-content img {
    max-width: 100%;
    max-height: calc(90vh - 80px);
    object-fit: contain;
    border-radius: 8px;
    box-shadow: var(--shadow-modal);
}

.modal-close {
    position: absolute;
    top: -50px;
    right: 0;
    background: var(--modal-button-bg);
    border: 1px solid var(--modal-button-border);
    color: var(--text-white);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    backdrop-filter: blur(10px);
}

.modal-close:hover {
    background: var(--modal-button-hover);
    transform: rotate(90deg);
}

.modal-actions {
    display: flex;
    gap: 0.5rem;
}

.modal-actions .btn {
    min-width: 120px;
}

/* ============================================
   10. LOADING & STATES
   ============================================ */

.loading {
    text-align: center;
    padding: 3rem;
    color: var(--text-secondary);
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

.error-message {
    background: var(--error-bg);
    color: var(--danger-color);
    padding: 1.5rem;
    border-radius: 12px;
    text-align: center;
    border: 1px solid var(--error-border);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.error-message svg {
    color: var(--danger-color);
}

.empty-state {
    text-align: center;
    padding: 3rem;
    color: var(--text-secondary);
}

.empty-icon {
    margin: 0 auto 1rem;
    opacity: 0.5;
    color: var(--text-secondary);
}

/* ============================================
   11. FOOTER
   ============================================ */

.thank-you-section {
    text-align: center;
    padding: 1.5rem 1rem;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 50;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    backdrop-filter: blur(10px);
    background: var(--footer-bg);
}

.thank-you-text,
.made-with-love {
    color: var(--text-secondary);
    font-size: 0.75rem;
    margin: 0;
}

.thank-you-text a,
.made-with-love a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

.made-with-love a {
    font-weight: 500;
}

.thank-you-text a:hover,
.made-with-love a:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

.fork-info {
    color: var(--text-secondary);
    font-size: 0.7rem;
    margin: 0;
    opacity: 0.7;
}

.fork-info a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.2s ease;
}

.fork-info a:hover {
    color: var(--primary-color);
    opacity: 1;
}

.heart {
    color: var(--danger-color);
    display: inline-block;
    animation: heartbeat 1.5s ease-in-out infinite;
}

/* ============================================
   12. ANIMATIONS
   ============================================ */

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

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.1); opacity: 0.8; }
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

@keyframes heartbeat {
    0%, 100% { transform: scale(1); }
    10%, 30% { transform: scale(1.1); }
    20%, 40% { transform: scale(1); }
}

/* ============================================
   13. RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 768px) {
    body {
        padding: 1rem 0.5rem;
    }

    .header-actions {
        position: static;
        justify-content: center;
        margin-bottom: 2rem;
    }

    h1 {
        font-size: 1.5rem;
    }

    .files-grid {
        grid-template-columns: 1fr;
    }

    .upload-section {
        padding: 1.5rem;
    }

    .custom-file-upload {
        padding: 2rem 1rem;
    }
}