:root {
    --primary-color: #0f172a;
    --primary-accent: #3b82f6;
    --success-accent: #10b981;
    --warning-accent: #f59e0b;
    --danger-accent: #ef4444;
    --bg-main: #f8fafc;
    --glass-bg: rgba(255, 255, 255, 0.8);
    --glass-border: rgba(255, 255, 255, 0.2);
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --card-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --card-hover-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

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

body {
    font-family: 'Sarabun', sans-serif;
    background-color: var(--bg-main);
    background-image: 
        radial-gradient(at 0% 0%, rgba(59, 130, 246, 0.1) 0, transparent 50%), 
        radial-gradient(at 50% 0%, rgba(16, 185, 129, 0.1) 0, transparent 50%);
    margin: 0;
    min-height: 100vh;
    color: var(--text-primary);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px 60px 20px;
}

/* --- Hero Section --- */
.hero {
    padding: 80px 20px 60px;
    text-align: center;
}

.hero .logo-wrapper {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-accent), var(--success-accent));
    border-radius: 20px;
    margin-bottom: 25px;
    color: white;
    font-size: 2.5em;
    box-shadow: 0 10px 25px rgba(59, 130, 246, 0.3);
    animation: floating 3s ease-in-out infinite;
}

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

.hero h1 {
    font-size: 3.5em;
    font-weight: 800;
    margin: 0;
    background: linear-gradient(to right, var(--primary-color), var(--primary-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -1px;
}

.hero p {
    font-size: 1.25em;
    color: var(--text-secondary);
    margin-top: 15px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* --- Search Bar --- */
.search-container {
    margin: 40px auto;
    max-width: 600px;
    position: relative;
}

.search-box {
    background: white;
    padding: 5px 10px 5px 25px;
    border-radius: 100px;
    display: flex;
    align-items: center;
    box-shadow: var(--card-shadow);
    border: 1px solid #e2e8f0;
    transition: all 0.3s ease;
}

.search-box:focus-within {
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
    border-color: var(--primary-accent);
    transform: scale(1.02);
}

.search-box i {
    color: var(--text-secondary);
    font-size: 1.2em;
}

.search-box input {
    border: none;
    outline: none;
    padding: 15px;
    width: 100%;
    font-size: 1.1em;
    font-family: inherit;
    background: transparent;
}

/* --- Grid & Sections --- */
.indicator-section {
    margin-bottom: 50px;
    animation: modalSlideUp 0.5s ease forwards;
}

.section-header {
    display: flex;
    align-items: center;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 2px solid #e2e8f0;
}

.section-badge {
    background: var(--primary-accent);
    color: white;
    font-weight: 700;
    padding: 6px 15px;
    border-radius: 10px;
    margin-right: 20px;
    font-size: 1.1em;
    box-shadow: 0 4px 6px rgba(59, 130, 246, 0.2);
}

.section-header h2 {
    margin: 0;
    color: var(--primary-color);
    font-size: 1.4em;
    font-weight: 700;
}

.indicator-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

@media (max-width: 900px) {
    .indicator-grid { grid-template-columns: 1fr; }
    .section-header { flex-direction: column; align-items: flex-start; gap: 10px; }
    .section-badge { margin-right: 0; }
}

/* --- Premium Cards --- */
.card-wrapper {
    text-decoration: none;
    color: inherit;
    display: block;
}

.card {
    background: white;
    border-radius: 24px;
    padding: 30px;
    display: flex;
    align-items: center;
    position: relative;
    border: 1px solid #edf2f7;
    box-shadow: var(--card-shadow);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; width: 6px; height: 100%;
    background: var(--primary-accent);
    opacity: 0;
    transition: 0.3s;
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: var(--card-hover-shadow);
    border-color: var(--primary-accent);
}

.card:hover::before {
    opacity: 1;
}

.card-icon {
    width: 70px;
    height: 70px;
    background: #f1f5f9;
    border-radius: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6em;
    font-weight: 800;
    color: var(--primary-accent);
    margin-right: 25px;
    flex-shrink: 0;
    transition: 0.3s;
}

.card:hover .card-icon {
    background: var(--primary-accent);
    color: white;
    transform: rotate(5deg);
}

.card-content {
    flex-grow: 1;
}

.card-title {
    font-size: 1.15em;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1.5;
    margin-bottom: 8px;
}

.card-meta {
    display: flex;
    gap: 15px;
    font-size: 0.85em;
    color: var(--text-secondary);
}

.meta-item { display: flex; align-items: center; gap: 5px; }
.meta-item.status { color: var(--success-accent); font-weight: 600; }

.card-arrow {
    font-size: 1.2em;
    color: #cbd5e1;
    transition: 0.3s;
}

.card:hover .card-arrow {
    color: var(--primary-accent);
    transform: translateX(8px);
}

/* --- Modals --- */
.modal {
    display: none;
    position: fixed;
    z-index: 5000;
    left: 0; top: 0; width: 100%; height: 100%;
    background: rgba(15, 23, 42, 0.7);
    backdrop-filter: blur(10px);
}

.modal-content {
    background: white;
    margin: 30px auto;
    width: 90%;
    max-width: 900px;
    border-radius: 30px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    position: relative;
    max-height: calc(100vh - 60px);
    display: flex;
    flex-direction: column;
    animation: modalSlideUp 0.5s cubic-bezier(0.165, 0.84, 0.44, 1);
}

@keyframes modalSlideUp {
    from { opacity: 0; transform: translateY(50px); }
    to { opacity: 1; transform: translateY(0); }
}

.modal-header {
    padding: 35px 40px;
    border-bottom: 1px solid #f1f5f9;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-title-wrapper h2 {
    margin: 0;
    font-size: 1.6em;
    color: var(--primary-color);
}

.close-modal {
    width: 45px;
    height: 45px;
    background: #f1f5f9;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: 0.3s;
    font-size: 1.2em;
    color: var(--text-secondary);
}

.close-modal:hover {
    background: var(--danger-accent);
    color: white;
}

.modal-body {
    padding: 20px 40px 40px;
    overflow-y: auto;
}

/* --- File Items (Notion-style) --- */
.file-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

/* Image Preview for O1, O2 */
.image-preview-container {
    text-align: center;
    margin-bottom: 20px;
    background: #f1f5f9;
    padding: 15px;
    border-radius: 15px;
    border: 1px dashed #cbd5e1;
}

.image-preview-container img {
    max-width: 100%;
    max-height: 400px;
    object-fit: contain;
    border-radius: 10px;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    display: block;
    margin: 0 auto;
    cursor: zoom-in;
    transition: var(--transition);
}

.image-preview-container img:hover {
    transform: scale(1.01);
}

.file-row {
    display: flex;
    align-items: center;
    padding: 18px 25px;
    background: #f8fafc;
    border-radius: 18px;
    text-decoration: none;
    color: inherit;
    transition: 0.2s;
    border: 1px solid transparent;
}

.file-row:hover {
    background: white;
    border-color: var(--primary-accent);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    transform: scale(1.01);
}

.file-icon {
    font-size: 1.8em;
    margin-right: 20px;
    width: 40px;
    text-align: center;
}

.file-info { flex-grow: 1; }
.file-name { font-weight: 600; font-size: 1.05em; color: var(--text-primary); }
.file-sub { font-size: 0.8em; color: var(--text-secondary); margin-top: 2px; }

.file-badge {
    padding: 5px 12px;
    border-radius: 8px;
    font-size: 0.75em;
    font-weight: 700;
    text-transform: uppercase;
}

/* --- O4 Link Cards --- */
.link-card-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 25px;
    padding: 15px 0;
}

.link-card-item {
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    border-radius: 24px;
    padding: 35px 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    text-decoration: none;
    color: var(--text-primary);
    border: 1px solid #e2e8f0;
    box-shadow: 0 10px 15px -3px rgba(0,0,0,0.05);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.link-card-item:hover {
    transform: translateY(-8px);
    border-color: var(--primary-accent);
    box-shadow: 0 20px 25px -5px rgba(59,130,246,0.15);
}

.link-card-item::after {
    content: '';
    position: absolute;
    top: 0; left: 0; width: 100%; height: 4px;
    background: var(--primary-accent);
    opacity: 0;
    transition: 0.3s;
}

.link-card-item:hover::after {
    opacity: 1;
}

.link-card-icon {
    width: 70px;
    height: 70px;
    background: #eff6ff;
    color: var(--primary-accent);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 2em;
    margin-bottom: 20px;
    transition: 0.3s;
}

.link-card-item:hover .link-card-icon {
    background: var(--primary-accent);
    color: white;
    transform: scale(1.1) rotate(5deg);
}

.link-card-title {
    font-size: 1.25em;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--primary-color);
}

.link-card-sub {
    font-size: 0.9em;
    color: var(--text-secondary);
}

.link-card-arrow {
    margin-top: 20px;
    color: #cbd5e1;
    font-size: 1.4em;
    transition: 0.3s;
}

.link-card-item:hover .link-card-arrow {
    color: var(--primary-accent);
    transform: translateY(5px);
}

/* --- PDF Viewer --- */
#pdfViewerModal .modal-content {
    max-width: 1100px;
    height: 95vh;
}

.viewer-frame-container {
    flex-grow: 1;
    background: #f1f5f9;
    border-radius: 0 0 30px 30px;
    overflow: hidden;
    position: relative;
}

iframe#pdfViewer {
    width: 100%;
    height: 100%;
    border: none;
}

.viewer-actions {
    display: flex;
    gap: 15px;
}

.btn-premium {
    padding: 10px 20px;
    border-radius: 12px;
    background: var(--primary-accent);
    color: white;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9em;
    transition: 0.3s;
}

.btn-premium:hover {
    background: var(--primary-color);
    box-shadow: 0 4px 10px rgba(59, 130, 246, 0.4);
}

/* Icons */
.pdf { color: #ef4444; }
.word { color: #3b82f6; }
.excel { color: #10b981; }
.url { color: #8b5cf6; }
.image { color: #f59e0b; }

/* Footer */
.footer {
    text-align: center;
    padding: 40px 0;
    border-top: 1px solid #e2e8f0;
    color: var(--text-secondary);
    font-size: 0.95em;
}