:root {
    --primary-color: #4a90e2;
    --primary-dark: #357abd;
    --bg-color: #f0f2f5;
    --text-color: #333;
    --card-bg: #fff;
    --success-color: #2ecc71;
    --danger-color: #e74c3c;
    --warning-color: #f39c12;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    --radius: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Install Banner */
.install-banner {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    padding: 12px 15px;
    position: sticky;
    top: 0;
    z-index: 1001;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.install-banner.hidden {
    display: none;
}

.install-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
    max-width: 600px;
    margin: 0 auto;
}

.install-text {
    font-size: 0.9em;
    font-weight: 500;
    flex: 1;
}

.install-buttons {
    display: flex;
    gap: 8px;
    align-items: center;
}

.install-banner .btn {
    padding: 8px 16px;
    font-size: 0.85em;
}

.btn-dismiss {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    padding: 6px 10px !important;
    min-width: auto;
}

.btn-dismiss:hover {
    background: rgba(255, 255, 255, 0.3);
}

.container {
    width: 100%;
    max-width: 100%;
    background: var(--card-bg);
    padding: 0;
    border-radius: 0;
    box-shadow: none;
    flex: 1;
    overflow: hidden;
}

header {
    text-align: center;
    margin-bottom: 30px;
}

.hero-image img {
    width: 100%;
    height: auto;
    display: block;
    max-height: 200px;
    object-fit: cover;
}

header h1 {
    margin: 20px 0 10px;
    color: var(--text-color);
    font-size: 2rem;
}

header p {
    color: #666;
    margin-bottom: 0;
}

.upload-section {
    text-align: center;
    margin-bottom: 30px;
    padding: 0 20px;
}

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

.custom-file-upload {
    display: inline-block;
    padding: 15px 30px;
    cursor: pointer;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1.1rem;
    box-shadow: 0 4px 15px rgba(74, 144, 226, 0.3);
    transition: transform 0.2s, box-shadow 0.2s;
}

.custom-file-upload:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(74, 144, 226, 0.4);
}

.custom-file-upload:active {
    transform: translateY(0);
}

.status {
    text-align: center;
    margin-bottom: 20px;
    font-style: italic;
    color: #666;
    padding: 0 20px;
}

.hidden {
    display: none;
}

/* PDF List Section */
#pdfs-section {
    padding: 0 20px 20px;
}

#pdfs-section h2 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--text-color);
    border-bottom: 2px solid var(--bg-color);
    padding-bottom: 10px;
    text-align: center;
}

#pdf-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.pdf-item {
    background: #fff;
    border: 1px solid #eee;
    padding: 12px 15px;
    margin-bottom: 10px;
    border-radius: 10px;
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

.pdf-item:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.pdf-info {
    display: flex;
    flex-direction: column;
    gap: 4px;
    flex: 1;
    min-width: 0;
}

.pdf-name {
    font-weight: 600;
    color: var(--text-color);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    cursor: text;
    padding: 4px 8px;
    margin: -4px -8px;
    border-radius: 4px;
    transition: background-color 0.2s;
}

.pdf-name:hover {
    background-color: rgba(74, 144, 226, 0.1);
}

/* Inline edit input - Excel style */
.pdf-name-input {
    font-weight: 600;
    font-size: inherit;
    font-family: inherit;
    color: var(--text-color);
    padding: 4px 8px;
    margin: -4px -8px;
    border: 2px solid var(--primary-color);
    border-radius: 4px;
    background: #fff;
    outline: none;
    width: calc(100% + 16px);
    box-sizing: border-box;
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.2);
}

.pdf-stats {
    font-size: 0.85em;
    color: #888;
}

.pdf-actions {
    display: flex;
    gap: 8px;
    align-items: center;
}

/* Results Section */
#results-section {
    padding: 0 20px 20px;
}

.results-header {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
}

.results-header h2 {
    font-size: 1.5rem;
    margin: 0;
    color: var(--text-color);
    text-align: center;
}

.current-pdf {
    font-size: 0.9em;
    color: #666;
    font-style: italic;
}

#qr-list {
    list-style: none;
    padding: 0;
}

.qr-item {
    background: #fff;
    border: 1px solid #eee;
    padding: 8px 12px;
    margin-bottom: 8px;
    border-radius: 8px;
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: 20px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

.qr-item:hover {
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.qr-item.read {
    opacity: 0.7;
    background: #f8f9fa;
    border-color: transparent;
}

.qr-content {
    display: none;
}

.qr-page {
    font-size: 0.9em;
    color: #555;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 700;
    white-space: nowrap;
}

.qr-actions {
    display: flex;
    gap: 10px;
    align-items: center;
}

/* Buttons */
.btn {
    padding: 6px 12px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85em;
    font-weight: 600;
    transition: background-color 0.2s, transform 0.1s;
    text-transform: uppercase;
    white-space: nowrap;
}

.btn:active {
    transform: scale(0.95);
}

.btn-mark {
    background-color: var(--success-color);
    color: white;
}

.btn-mark:hover {
    background-color: #27ae60;
}

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

.btn-show:hover {
    background-color: var(--primary-dark);
}

.btn-back {
    background-color: #95a5a6;
    color: white;
    align-self: flex-start;
}

.btn-back:hover {
    background-color: #7f8c8d;
}

.btn-rename {
    background-color: var(--warning-color);
    color: white;
    padding: 6px 10px;
}

.btn-rename:hover {
    background-color: #e67e22;
}

.btn-delete {
    background-color: var(--danger-color);
    color: white;
    padding: 6px 10px;
}

.btn-delete:hover {
    background-color: #c0392b;
}

/* Modal Styles */
.modal {
    display: flex;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.5);
    justify-content: center;
    align-items: center;
}

.modal.hidden {
    display: none;
}

.modal-content {
    background-color: #fefefe;
    padding: 20px;
    border: 1px solid #888;
    width: 85%;
    max-width: 500px;
    border-radius: 12px;
    text-align: center;
    position: relative;
}

.modal-content h3 {
    margin: 0 0 20px 0;
    color: var(--text-color);
}

.close-modal,
.close-rename-modal {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    position: absolute;
    right: 15px;
    top: 5px;
}

.close-modal:hover,
.close-modal:focus,
.close-rename-modal:hover,
.close-rename-modal:focus {
    color: black;
    text-decoration: none;
    cursor: pointer;
}

#modal-qr-image {
    max-width: 100%;
    height: auto;
    margin-bottom: 15px;
    border: 1px solid #ddd;
    border-radius: 8px;
}

#modal-qr-text {
    word-break: break-all;
    font-family: monospace;
    background: #f5f5f5;
    padding: 10px;
    border-radius: 6px;
}

/* Responsive adjustments */
@media (max-width: 400px) {
    .install-content {
        flex-direction: column;
        text-align: center;
    }

    .install-text {
        margin-bottom: 8px;
    }

    .pdf-item {
        flex-direction: column;
        align-items: stretch;
    }

    .pdf-actions {
        justify-content: flex-end;
        margin-top: 8px;
    }

    .qr-item {
        gap: 10px;
    }

    .btn {
        padding: 5px 10px;
        font-size: 0.8em;
    }
}

/* Footer */
.app-footer {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    text-align: center;
    padding: 15px 20px;
    margin-top: auto;
    font-size: 0.85em;
}

.app-footer p {
    margin: 0;
    opacity: 0.9;
}