/* -------------------------------------------------------------
   STYLESHEET: Pattern Recognition (การหารูปแบบ) Educational Media
   Theme: Pastel Orange (โทนสีส้มพาสเทล ละมุนตา)
   Fonts: Prompt (Headers), Sarabun (Body), Inter (Numbers/Code)
   ------------------------------------------------------------- */

/* --- CSS VARIABLES & SYSTEM DESIGN --- */
:root {
    --primary: #ff8f52;        /* Pastel Orange */
    --primary-hover: #e67233;  /* Deep Orange */
    --primary-light: #ffebe0;  /* Very Soft Orange */
    --primary-bg: #fff6f0;     /* Light Orange Background */
    --secondary: #ffb085;      /* Pastel Peach */
    --secondary-light: #fff0e8;
    --accent: #8cc0de;         /* Soft Pastel Blue (for contrast) */
    --accent-light: #e5f2fa;
    --accent-hover: #69a3c4;
    --success: #6cc496;        /* Pastel Green */
    --success-bg: #eefaf3;
    --error: #ff8b94;          /* Pastel Red */
    --error-bg: #fff0f2;
    --warning: #ffd3b6;        /* Pastel Gold/Amber */
    --warning-bg: #fffcf0;
    
    --slate-900: #4a3e3d;      /* Text Dark (Soft brown-charcoal) */
    --slate-700: #6b5a59;      /* Text Medium */
    --slate-500: #948281;      /* Text Muted */
    --slate-300: #ebdcdb;      /* Borders */
    --slate-100: #fbf6f5;      /* Light Cream Grey */
    
    --card-bg: rgba(255, 255, 255, 0.85);
    --border-glass: rgba(255, 255, 255, 0.5);
    --shadow-sm: 0 4px 6px -1px rgba(139, 92, 26, 0.03), 0 2px 4px -2px rgba(139, 92, 26, 0.03);
    --shadow-md: 0 10px 15px -3px rgba(139, 92, 26, 0.06), 0 4px 6px -4px rgba(139, 92, 26, 0.06);
    --shadow-lg: 0 20px 25px -5px rgba(139, 92, 26, 0.08), 0 8px 10px -6px rgba(139, 92, 26, 0.08);
    
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-full: 9999px;
    
    --font-header: 'Prompt', 'Sarabun', sans-serif;
    --font-body: 'Sarabun', 'Prompt', sans-serif;
    --font-mono: 'Inter', monospace;
    
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- RESET & BASIC STYLES --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    background-color: #fcf8f6;
    color: var(--slate-700);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* --- BACKGROUND DECORATIONS --- */
.bg-decorations {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -100;
    pointer-events: none;
    overflow: hidden;
}

.blob {
    position: absolute;
    border-radius: var(--radius-full);
    filter: blur(80px);
    opacity: 0.5;
}

.blob-1 {
    width: 450px;
    height: 450px;
    background-color: #ffe0cc; /* Pastel Orange light */
    top: -100px;
    left: -100px;
    animation: floatBlob 22s infinite alternate;
}

.blob-2 {
    width: 550px;
    height: 550px;
    background-color: #ffece0; /* Softer Orange/Peach */
    bottom: -150px;
    right: -100px;
    animation: floatBlob 27s infinite alternate-reverse;
}

.blob-3 {
    width: 350px;
    height: 350px;
    background-color: #e3f2fd; /* Light Blue contrast */
    top: 35%;
    left: 45%;
    animation: floatBlob 19s infinite alternate;
}

.cloud {
    position: absolute;
    color: rgba(255, 255, 255, 0.75);
    font-size: 6rem;
    pointer-events: none;
    z-index: -90;
    animation: floatCloud 35s linear infinite;
}

.cloud-1 {
    top: 10%;
    left: -12%;
}

.cloud-2 {
    bottom: 15%;
    right: -12%;
    animation-delay: 17s;
    animation-duration: 45s;
}

@keyframes floatBlob {
    0% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(60px, 90px) scale(1.1); }
    100% { transform: translate(-40px, 50px) scale(0.9); }
}

@keyframes floatCloud {
    0% { transform: translateX(-100%) translateY(0); }
    50% { transform: translateX(100vw) translateY(-15px); }
    100% { transform: translateX(200vw) translateY(0); }
}

/* --- NAVIGATION BAR --- */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(252, 248, 246, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-glass);
    box-shadow: var(--shadow-sm);
    padding: 0.6rem 0;
}

.nav-container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: var(--slate-900);
    gap: 0.75rem;
    transition: var(--transition-fast);
}

.logo-icon {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.35rem;
    box-shadow: 0 4px 12px rgba(255, 143, 82, 0.25);
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-title {
    font-family: var(--font-header);
    font-weight: 700;
    font-size: 1.15rem;
    line-height: 1.2;
    background: linear-gradient(135deg, var(--primary-hover), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo-subtitle {
    font-size: 0.75rem;
    color: var(--slate-500);
}

.nav-menu {
    display: flex;
    list-style: none;
    align-items: center;
    gap: 0.4rem;
}

.nav-item {
    position: relative;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    text-decoration: none;
    color: var(--slate-700);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 0.95rem;
    font-family: var(--font-header);
    transition: var(--transition-fast);
}

.nav-link:hover, .nav-link.active {
    background-color: var(--primary-light);
    color: var(--primary-hover);
}

/* Dropdown Menu */
.nav-item.dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: white;
    box-shadow: var(--shadow-lg);
    border-radius: var(--radius-md);
    padding: 0.5rem;
    min-width: 240px;
    list-style: none;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: var(--transition-normal);
    z-index: 1100;
    border: 1px solid var(--slate-300);
}

.nav-item.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    width: 100%;
    text-align: left;
    margin: 0.2rem 0;
}

.dropdown-arrow {
    font-size: 0.7rem;
    margin-left: 0.2rem;
    transition: var(--transition-fast);
}

.nav-item.dropdown:hover .dropdown-arrow {
    transform: rotate(180deg);
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--slate-700);
    cursor: pointer;
}

/* --- MAIN CONTENT LAYOUT --- */
.content-container {
    flex: 1;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

.app-section {
    display: none;
    animation: fadeIn var(--transition-normal) forwards;
}

.app-section.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(15px); }
    to { opacity: 1; transform: translateY(0); }
}

/* --- SECTION HEADER --- */
.section-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.section-title {
    font-family: var(--font-header);
    font-weight: 700;
    font-size: 2rem;
    color: var(--slate-900);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}

.section-title i {
    color: var(--primary);
}

.section-subtitle {
    font-size: 1.05rem;
    color: var(--slate-500);
}

/* --- UTILITY COMPONENTS --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-family: var(--font-header);
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-fast);
    padding: 0.75rem 1.5rem;
    font-size: 0.95rem;
    box-shadow: var(--shadow-sm);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-hover), var(--primary));
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(255, 143, 82, 0.3);
}

.btn-secondary {
    background: white;
    color: var(--slate-700);
    border: 1px solid var(--slate-300);
}

.btn-secondary:hover {
    background: var(--slate-100);
    transform: translateY(-2px);
}

.btn-accent {
    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
    color: white;
}

.btn-accent:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(140, 192, 222, 0.35);
}

.btn-danger {
    background: var(--error);
    color: white;
}

.btn-danger:hover {
    background: #e27179;
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(255, 139, 148, 0.3);
}

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

.btn-success:hover {
    background: #5ab183;
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(108, 196, 150, 0.3);
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.1rem;
    border-radius: var(--radius-md);
}

.btn-sm {
    padding: 0.5rem 1.1rem;
    font-size: 0.875rem;
    border-radius: var(--radius-sm);
}

.btn-xs {
    padding: 0.3rem 0.6rem;
    font-size: 0.75rem;
    border-radius: var(--radius-sm);
    font-weight: 500;
}

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

/* Badges */
.badge {
    display: inline-block;
    padding: 0.3rem 0.8rem;
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: 600;
    font-family: var(--font-header);
}

.primary-badge {
    background-color: var(--primary-light);
    color: var(--primary-hover);
}

.accent-badge {
    background-color: var(--accent-light);
    color: var(--accent-hover);
}

.pink-badge {
    background-color: var(--error-bg);
    color: var(--error);
}

.green-badge {
    background-color: var(--success-bg);
    color: var(--success);
}

.warning-badge {
    background-color: var(--warning-bg);
    color: #cc8e35;
}

/* --- HERO CARD (HOME) --- */
.hero-card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-lg);
    padding: 3rem 2rem;
    text-align: center;
    box-shadow: var(--shadow-lg);
    margin-bottom: 2.5rem;
    position: relative;
    overflow: hidden;
}

.hero-badge {
    display: inline-block;
    background-color: var(--primary-light);
    color: var(--primary-hover);
    padding: 0.4rem 1.4rem;
    border-radius: var(--radius-full);
    font-weight: 700;
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
    letter-spacing: 0.05em;
    font-family: var(--font-header);
    border: 1px dashed rgba(255, 143, 82, 0.4);
}

.hero-title {
    font-family: var(--font-header);
    font-weight: 700;
    font-size: 2.8rem;
    color: var(--slate-900);
    line-height: 1.25;
    margin-bottom: 1.5rem;
}

.hero-desc {
    font-size: 1.15rem;
    color: var(--slate-700);
    max-width: 800px;
    margin: 0 auto 2rem;
}

.hero-teacher {
    margin-bottom: 2rem;
}

.teacher-tag {
    background: white;
    border: 1px solid var(--slate-300);
    padding: 0.5rem 1.4rem;
    border-radius: var(--radius-full);
    font-size: 0.95rem;
    color: var(--slate-700);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.teacher-tag i {
    color: var(--primary);
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 1.25rem;
    flex-wrap: wrap;
}

/* Grid layout templates */
.grid-cards {
    display: grid;
    gap: 1.5rem;
}

.two-cols {
    grid-template-columns: repeat(2, 1fr);
}

.three-cols {
    grid-template-columns: repeat(3, 1fr);
}

/* Stat Cards */
.stat-card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
    border-top: 4px solid var(--primary);
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.stat-icon {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    margin-bottom: 1.25rem;
}

.orange-bg { background-color: var(--primary-light); color: var(--primary); }
.green-bg { background-color: var(--success-bg); color: var(--success); }
.blue-bg { background-color: var(--accent-light); color: var(--accent-hover); }

.stat-card h3 {
    font-family: var(--font-header);
    font-size: 1.25rem;
    color: var(--slate-900);
    margin-bottom: 0.5rem;
}

.stat-card p {
    font-size: 0.95rem;
    color: var(--slate-700);
}

/* --- SECTION 2: LEARN (Pillars & Lessons) --- */
.intro-block {
    background: white;
    border-radius: var(--radius-md);
    padding: 1.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-sm);
    border-left: 5px solid var(--primary);
    font-size: 1.05rem;
}

.pillars-grid {
    margin-bottom: 3rem;
}

.pillar-card {
    background: var(--card-bg);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-md);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    cursor: pointer;
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.pillar-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 5px;
    height: 100%;
    background: linear-gradient(to bottom, var(--primary), var(--secondary));
    transform: scaleY(0);
    transform-origin: top;
    transition: var(--transition-normal);
}

.pillar-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.pillar-card:hover::after {
    transform: scaleY(1);
}

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

.pillar-number {
    font-family: var(--font-mono);
    font-size: 2rem;
    font-weight: 800;
    color: rgba(255, 143, 82, 0.15);
}

.pillar-icon {
    font-size: 2rem;
    color: var(--primary);
}

.pillar-card h3 {
    font-family: var(--font-header);
    font-size: 1.35rem;
    color: var(--slate-900);
    margin-bottom: 0.25rem;
}

.pillar-english {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--slate-500);
    margin-bottom: 1rem;
    font-weight: 500;
}

.pillar-brief {
    font-size: 0.95rem;
    color: var(--slate-700);
    margin-bottom: 1.5rem;
}

.learn-more-btn {
    font-family: var(--font-header);
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 0.25rem;
    transition: var(--transition-fast);
}

.pillar-card:hover .learn-more-btn {
    gap: 0.5rem;
    color: var(--primary-hover);
}

/* Modal styling */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100vw;
    height: 100vh;
    overflow: auto;
    background-color: rgba(74, 62, 61, 0.45);
    backdrop-filter: blur(6px);
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
}

.modal.active {
    display: flex;
}

.modal-content {
    background-color: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 720px;
    padding: 2.5rem;
    position: relative;
    animation: modalOpen var(--transition-normal) forwards;
    border: 2px solid var(--primary-light);
}

@keyframes modalOpen {
    from { opacity: 0; transform: translateY(-50px) scale(0.95); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-close {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    font-size: 2rem;
    font-weight: 400;
    color: var(--slate-500);
    cursor: pointer;
    transition: var(--transition-fast);
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
}

.modal-close:hover {
    background-color: var(--slate-100);
    color: var(--slate-900);
}

/* Pillar detail modal body content */
.detail-title {
    font-family: var(--font-header);
    font-size: 1.75rem;
    color: var(--slate-900);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.detail-title i {
    color: var(--primary);
}

.detail-english {
    font-family: var(--font-mono);
    color: var(--slate-500);
    font-size: 1rem;
    margin-bottom: 1.5rem;
}

.detail-section {
    margin-bottom: 1.5rem;
}

.detail-section h4 {
    font-family: var(--font-header);
    color: var(--slate-900);
    margin-bottom: 0.5rem;
    font-size: 1.15rem;
}

.detail-example-box {
    background-color: var(--primary-bg);
    border: 1px solid var(--primary-light);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    margin-top: 1rem;
}

.detail-example-box h5 {
    color: var(--primary-hover);
    font-family: var(--font-header);
    margin-bottom: 0.5rem;
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

/* Detailed lessons section */
.learn-tabs {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 2rem;
    border-bottom: 2px solid var(--slate-300);
    padding-bottom: 0.5rem;
    flex-wrap: wrap;
}

.tab-btn {
    background: none;
    border: none;
    padding: 0.75rem 1.25rem;
    font-family: var(--font-header);
    font-weight: 600;
    font-size: 1rem;
    color: var(--slate-700);
    cursor: pointer;
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    transition: var(--transition-fast);
    position: relative;
}

.tab-btn:hover {
    color: var(--primary);
    background-color: var(--slate-100);
}

.tab-btn.active {
    color: var(--primary);
}

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 100%;
    height: 4px;
    background-color: var(--primary);
    border-radius: var(--radius-full);
}

.tab-content-container {
    background: white;
    border-radius: var(--radius-md);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    margin-bottom: 2rem;
    border: 1px solid var(--slate-300);
}

.tab-pane {
    display: none;
    animation: fadeIn 0.4s ease forwards;
}

.tab-pane.active {
    display: block;
}

/* Mouse Example styling */
.mouse-examples {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    margin-top: 1.5rem;
}

.mouse-card {
    background-color: var(--slate-100);
    border: 1px solid var(--slate-300);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    text-align: center;
    transition: var(--transition-fast);
}

.mouse-card:hover {
    transform: translateY(-3px);
    border-color: var(--primary);
    background-color: var(--primary-bg);
}

.mouse-svg {
    width: 60px;
    height: 60px;
    margin: 0 auto 0.75rem;
}

.mouse-card h5 {
    font-family: var(--font-header);
    color: var(--slate-900);
    font-size: 0.95rem;
    margin-bottom: 0.25rem;
}

.mouse-card p {
    font-size: 0.8rem;
    color: var(--slate-500);
}

/* Mouse Pattern Summary Box */
.pattern-summary-box {
    background-color: var(--primary-bg);
    border: 1px dashed var(--primary);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    margin-top: 1.5rem;
}

.pattern-summary-box h4 {
    font-family: var(--font-header);
    color: var(--primary-hover);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.pattern-summary-box ul {
    list-style-type: none;
    padding-left: 0;
}

.pattern-summary-box li {
    margin-bottom: 0.5rem;
    position: relative;
    padding-left: 1.25rem;
}

.pattern-summary-box li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success);
    font-weight: bold;
}

/* --- SECTION 3: ACTIVITY 1 (TRASH GAME) --- */
.trash-game-layout {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 2rem;
}

@media (max-width: 900px) {
    .trash-game-layout {
        grid-template-columns: 1fr;
    }
}

.game-board {
    background: white;
    border-radius: var(--radius-md);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--slate-300);
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    min-height: 480px;
    justify-content: space-between;
}

.conveyor-belt {
    width: 100%;
    background-color: #ede0dd;
    height: 140px;
    border-radius: var(--radius-md);
    border: 3px solid var(--slate-300);
    margin-bottom: 2rem;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    box-shadow: inset 0 4px 10px rgba(0,0,0,0.08);
}

.conveyor-lines {
    position: absolute;
    width: 200%;
    height: 100%;
    background: repeating-linear-gradient(
        -45deg,
        transparent,
        transparent 20px,
        rgba(107, 90, 89, 0.08) 20px,
        rgba(107, 90, 89, 0.08) 40px
    );
    animation: moveBelt 6s linear infinite;
    pointer-events: none;
}

@keyframes moveBelt {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

.current-trash-container {
    z-index: 10;
    position: relative;
}

.trash-item-card {
    background: white;
    border: 2px solid var(--primary);
    border-radius: var(--radius-md);
    padding: 1rem;
    width: 220px;
    display: flex;
    flex-direction: column;
    align-items: center;
    box-shadow: var(--shadow-lg);
    cursor: grab;
    transition: transform 0.2s;
    user-select: none;
    animation: popIn 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.trash-item-card:active {
    cursor: grabbing;
    transform: scale(0.95);
}

@keyframes popIn {
    from { transform: scale(0.6); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

.trash-svg {
    width: 64px;
    height: 64px;
    margin-bottom: 0.5rem;
}

.trash-name {
    font-family: var(--font-header);
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--slate-900);
    text-align: center;
}

.bins-container {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    width: 100%;
}

@media (max-width: 600px) {
    .bins-container {
        grid-template-columns: repeat(2, 1fr);
    }
}

.trash-bin {
    border-radius: var(--radius-md);
    padding: 1.25rem 0.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    cursor: pointer;
    transition: var(--transition-fast);
    border: 2px solid transparent;
    color: white;
    text-align: center;
    box-shadow: var(--shadow-sm);
    min-height: 180px;
    justify-content: space-between;
}

.trash-bin:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.trash-bin.drag-over {
    transform: scale(1.05);
    border-color: white;
    box-shadow: 0 0 15px rgba(255,255,255,0.8);
}

/* Bin Colors */
.bin-organic {
    background: linear-gradient(135deg, #6cc496, #4ba375);
}
.bin-recycle {
    background: linear-gradient(135deg, #ffd3b6, #e6b89c);
    color: #4a3e3d; /* dark text for contrast on light yellow */
}
.bin-general {
    background: linear-gradient(135deg, #8cc0de, #6da0be);
}
.bin-hazardous {
    background: linear-gradient(135deg, #ff8b94, #e27179);
}

.bin-icon {
    font-size: 2.2rem;
    margin-bottom: 0.5rem;
}

.bin-name {
    font-family: var(--font-header);
    font-weight: 700;
    font-size: 1rem;
}

.bin-desc {
    font-size: 0.75rem;
    opacity: 0.9;
}

.game-stats {
    background: var(--card-bg);
    border: 1px solid var(--slate-300);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
    height: fit-content;
}

.stat-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.75rem;
    font-size: 1rem;
    font-weight: 600;
}

.stat-val {
    font-family: var(--font-mono);
    color: var(--primary-hover);
}

.progress-bar-game {
    background-color: var(--slate-300);
    height: 8px;
    border-radius: var(--radius-full);
    width: 100%;
    margin-top: 0.5rem;
    overflow: hidden;
}

.progress-fill-game {
    background-color: var(--primary);
    height: 100%;
    width: 0%;
    transition: width 0.3s;
}

.game-feedback {
    margin-top: 1rem;
    padding: 0.75rem;
    border-radius: var(--radius-sm);
    text-align: center;
    font-weight: 600;
    display: none;
}

.game-feedback.correct {
    background-color: var(--success-bg);
    color: var(--success);
    border: 1px solid rgba(108, 196, 150, 0.3);
    display: block;
}

.game-feedback.incorrect {
    background-color: var(--error-bg);
    color: var(--error);
    border: 1px solid rgba(255, 139, 148, 0.3);
    display: block;
}

.game-completed-box {
    text-align: center;
    padding: 2rem;
    display: none;
    animation: fadeIn var(--transition-normal);
}

.completed-icon {
    font-size: 4rem;
    color: var(--success);
    margin-bottom: 1rem;
}

/* --- SECTION 4: ACTIVITY 2 (VEHICLE GROUPING) --- */
.grouping-instructions {
    background-color: var(--primary-bg);
    border-left: 5px solid var(--primary);
    padding: 1.25rem;
    border-radius: var(--radius-md);
    margin-bottom: 2rem;
}

.grouping-workspace {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 2rem;
}

@media (max-width: 900px) {
    .grouping-workspace {
        grid-template-columns: 1fr;
    }
}

.vehicles-pool {
    background: white;
    border: 1px solid var(--slate-300);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
}

.vehicles-pool h3 {
    font-family: var(--font-header);
    margin-bottom: 1rem;
    color: var(--slate-900);
    border-bottom: 2px solid var(--slate-100);
    padding-bottom: 0.5rem;
}

.vehicles-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
}

@media (max-width: 600px) {
    .vehicles-grid {
        grid-template-columns: 1fr;
    }
}

.vehicle-card {
    background: var(--slate-100);
    border: 1.5px solid var(--slate-300);
    border-radius: var(--radius-md);
    padding: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: grab;
    transition: var(--transition-fast);
    user-select: none;
}

.vehicle-card:hover {
    transform: translateY(-2px);
    border-color: var(--primary);
    box-shadow: var(--shadow-sm);
}

.vehicle-card.dragging {
    opacity: 0.4;
    cursor: grabbing;
}

.vehicle-img-mini {
    width: 38px;
    height: 38px;
    flex-shrink: 0;
}

.vehicle-info-mini h4 {
    font-family: var(--font-header);
    font-size: 0.9rem;
    color: var(--slate-900);
}

.vehicle-info-mini p {
    font-size: 0.75rem;
    color: var(--slate-500);
}

.grouping-targets {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.group-container {
    background: white;
    border: 2px dashed var(--slate-300);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
    transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.group-container.drag-over {
    border-color: var(--primary);
    background-color: var(--primary-bg);
}

.group-header-input {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    align-items: center;
}

.group-title-label {
    font-family: var(--font-header);
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--slate-900);
    white-space: nowrap;
}

.group-title-input {
    flex: 1;
    font-family: var(--font-header);
    border: 1px solid var(--slate-300);
    border-radius: var(--radius-sm);
    padding: 0.4rem 0.8rem;
    font-size: 0.95rem;
    outline: none;
    transition: border-color var(--transition-fast);
}

.group-title-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px var(--primary-light);
}

.group-drop-zone {
    min-height: 80px;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    background-color: var(--slate-100);
    border-radius: var(--radius-sm);
    padding: 0.75rem;
    border: 1px solid var(--slate-300);
}

.group-drop-zone .vehicle-card {
    background-color: white;
    width: auto;
    flex-grow: 0;
    min-width: 140px;
}

.group-reason-box {
    margin-top: 0.75rem;
}

.group-reason-input {
    width: 100%;
    font-family: var(--font-body);
    border: 1.5px solid var(--slate-300);
    border-radius: var(--radius-sm);
    padding: 0.5rem 0.8rem;
    font-size: 0.9rem;
    resize: vertical;
    outline: none;
    min-height: 50px;
}

.group-reason-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px var(--primary-light);
}

.grouping-actions {
    margin-top: 2rem;
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
}

/* --- SECTION 5: ACTIVITY 3 (GCD/ห.ร.ม.) --- */
.gcd-container {
    background: white;
    border-radius: var(--radius-md);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--slate-300);
}

.gcd-inputs {
    display: flex;
    gap: 1.5rem;
    align-items: center;
    background-color: var(--primary-bg);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    border: 1px dashed var(--primary);
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.gcd-form-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.gcd-form-group label {
    font-family: var(--font-header);
    font-weight: 600;
    color: var(--slate-900);
    font-size: 0.95rem;
}

.gcd-input {
    font-family: var(--font-mono);
    border: 1.5px solid var(--slate-300);
    border-radius: var(--radius-sm);
    padding: 0.5rem 1rem;
    font-size: 1.1rem;
    width: 180px;
    outline: none;
    transition: var(--transition-fast);
}

.gcd-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px var(--primary-light);
}

.gcd-visualization-area {
    display: grid;
    grid-template-columns: 3fr 2fr;
    gap: 2rem;
}

@media (max-width: 800px) {
    .gcd-visualization-area {
        grid-template-columns: 1fr;
    }
}

.gcd-steps-box {
    background-color: var(--slate-100);
    border: 1.5px solid var(--slate-300);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    min-height: 320px;
}

.gcd-steps-box h3 {
    font-family: var(--font-header);
    margin-bottom: 1rem;
    color: var(--slate-900);
    font-size: 1.15rem;
    border-bottom: 1.5px solid var(--slate-300);
    padding-bottom: 0.5rem;
}

.gcd-step-line {
    font-family: var(--font-mono);
    font-size: 1.1rem;
    padding: 0.6rem;
    margin-bottom: 0.5rem;
    background-color: white;
    border-radius: var(--radius-sm);
    border-left: 4px solid var(--slate-300);
    box-shadow: var(--shadow-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
    opacity: 0;
    transform: translateY(10px);
    animation: slideUpFade 0.4s forwards;
}

@keyframes slideUpFade {
    to { opacity: 1; transform: translateY(0); }
}

.gcd-step-line.active {
    border-left-color: var(--primary);
    background-color: var(--primary-bg);
}

.gcd-step-line.final {
    border-left-color: var(--success);
    background-color: var(--success-bg);
    font-weight: bold;
}

.gcd-explanation-box {
    background: white;
    border: 1.5px solid var(--slate-300);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.pattern-animation-view {
    height: 140px;
    border: 1px dashed var(--slate-300);
    border-radius: var(--radius-sm);
    margin: 1rem 0;
    position: relative;
    overflow: hidden;
    background-color: var(--slate-100);
    display: flex;
    align-items: center;
    justify-content: center;
}

.pattern-arrow {
    position: absolute;
    font-size: 1.5rem;
    color: var(--primary);
    transition: transform 0.6s ease;
}

/* Arrow move transitions */
.arrow-dividend {
    animation: moveDividend 1s infinite alternate;
}

/* --- SECTION 6: QUIZ PANEL --- */
.quiz-container {
    background: white;
    border-radius: var(--radius-md);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--slate-300);
}

.quiz-progress {
    margin-bottom: 2rem;
}

.progress-info {
    display: flex;
    justify-content: space-between;
    font-weight: 600;
    font-family: var(--font-header);
    margin-bottom: 0.5rem;
}

.progress-bar-container {
    background-color: var(--slate-100);
    border: 1px solid var(--slate-300);
    height: 10px;
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-bar-fill {
    background: linear-gradient(to right, var(--primary), var(--secondary));
    height: 100%;
    width: 0%;
    transition: width 0.3s ease;
}

.quiz-card {
    margin-bottom: 2rem;
}

.quiz-question {
    font-family: var(--font-header);
    font-weight: 700;
    font-size: 1.35rem;
    color: var(--slate-900);
    margin-bottom: 1.5rem;
}

.quiz-options-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.8rem;
}

.quiz-option {
    background: var(--slate-100);
    border: 1.5px solid var(--slate-300);
    border-radius: var(--radius-md);
    padding: 1.1rem 1.5rem;
    font-size: 1.05rem;
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-family: var(--font-body);
}

.quiz-option:hover {
    border-color: var(--primary);
    background-color: var(--primary-bg);
}

.quiz-option.selected {
    border-color: var(--primary-hover);
    background-color: var(--primary-light);
    font-weight: bold;
}

.quiz-option.correct {
    border-color: var(--success);
    background-color: var(--success-bg);
    color: #3b845f;
    font-weight: bold;
}

.quiz-option.incorrect {
    border-color: var(--error);
    background-color: var(--error-bg);
    color: #cc636a;
    text-decoration: line-through;
}

.option-marker {
    width: 24px;
    height: 24px;
    border-radius: var(--radius-full);
    border: 2px solid var(--slate-500);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: bold;
    flex-shrink: 0;
}

.quiz-option.selected .option-marker {
    background-color: var(--primary);
    border-color: var(--primary);
    color: white;
}

.quiz-option.correct .option-marker {
    background-color: var(--success);
    border-color: var(--success);
    color: white;
}

.quiz-option.incorrect .option-marker {
    background-color: var(--error);
    border-color: var(--error);
    color: white;
}

.quiz-actions {
    display: flex;
    justify-content: space-between;
}

/* Quiz Results Screen */
.quiz-results-card {
    background: white;
    border-radius: var(--radius-lg);
    border: 2px solid var(--primary-light);
    padding: 3rem 2rem;
    text-align: center;
    box-shadow: var(--shadow-lg);
    animation: fadeIn var(--transition-normal);
}

.result-circle {
    width: 140px;
    height: 140px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--primary-light), var(--secondary-light));
    border: 5px solid var(--primary);
    margin: 0 auto 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.result-score {
    font-family: var(--font-mono);
    font-size: 3rem;
    font-weight: 800;
    color: var(--primary-hover);
    line-height: 1;
}

.result-label {
    font-size: 0.85rem;
    color: var(--slate-500);
    font-weight: 600;
}

.result-title {
    font-family: var(--font-header);
    font-size: 1.8rem;
    color: var(--slate-900);
    margin-bottom: 0.5rem;
}

.result-desc {
    color: var(--slate-700);
    margin-bottom: 2rem;
}

/* KPA evaluation bar graph */
.kpa-container {
    background-color: var(--slate-100);
    border: 1px solid var(--slate-300);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    max-width: 500px;
    margin: 0 auto 2rem;
    text-align: left;
}

.kpa-container h4 {
    font-family: var(--font-header);
    margin-bottom: 1rem;
    color: var(--slate-900);
    text-align: center;
}

.kpa-item {
    margin-bottom: 1rem;
}

.kpa-label {
    display: block;
    font-size: 0.9rem;
    margin-bottom: 0.3rem;
}

.kpa-bar-wrapper {
    background-color: var(--slate-300);
    height: 18px;
    border-radius: var(--radius-full);
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
}

.kpa-bar-fill {
    height: 100%;
    border-radius: var(--radius-full);
    transition: width 1s ease-out;
}

.kpa-percent {
    position: absolute;
    right: 10px;
    font-size: 0.8rem;
    font-weight: bold;
    color: var(--slate-900);
    font-family: var(--font-mono);
}

.orange-bg-kpa { background-color: var(--primary); }
.blue-bg-kpa { background-color: var(--accent); }
.pink-bg-kpa { background-color: var(--error); }

.review-list {
    text-align: left;
    margin-top: 2rem;
    border-top: 1px solid var(--slate-300);
    padding-top: 1.5rem;
}

.review-item {
    margin-bottom: 1.25rem;
    padding: 1rem;
    border-radius: var(--radius-sm);
    background-color: var(--slate-100);
    border-left: 4px solid var(--slate-300);
}

.review-item.correct { border-left-color: var(--success); }
.review-item.incorrect { border-left-color: var(--error); }

.review-q {
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.review-a {
    font-size: 0.95rem;
}

.result-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}

/* --- SECTION 7: SUMMARY & WORKSHEET --- */
.summary-cards-container {
    margin-bottom: 2.5rem;
}

.info-card {
    background: white;
    border: 1px solid var(--slate-300);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
}

.info-card h4 {
    font-family: var(--font-header);
    color: var(--slate-900);
    margin-bottom: 0.75rem;
    border-bottom: 2px solid var(--slate-100);
    padding-bottom: 0.4rem;
}

.info-card ul {
    padding-left: 1.25rem;
    font-size: 0.95rem;
}

.info-card li {
    margin-bottom: 0.4rem;
}

.simple-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

.simple-table th, .simple-table td {
    padding: 0.5rem 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--slate-300);
}

.simple-table th {
    background-color: var(--slate-100);
    font-family: var(--font-header);
}

/* Printable report design */
.profile-setup {
    background: white;
    border: 1px solid var(--slate-300);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    margin-bottom: 2rem;
    border-top: 4px solid var(--primary);
}

.profile-inputs {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    flex: 1;
    min-width: 240px;
}

.input-group label {
    font-family: var(--font-header);
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--slate-900);
}

.input-group input {
    font-family: var(--font-body);
    border: 1.5px solid var(--slate-300);
    border-radius: var(--radius-sm);
    padding: 0.5rem 1rem;
    font-size: 0.95rem;
    outline: none;
    transition: var(--transition-fast);
}

.input-group input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px var(--primary-light);
}

.report-box-wrapper {
    background-color: white;
    border: 2px solid var(--slate-300);
    border-radius: var(--radius-md);
    padding: 3rem 2.5rem;
    box-shadow: var(--shadow-lg);
    margin-bottom: 2rem;
    position: relative;
}

.report-header {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
    border-bottom: 2px solid var(--slate-900);
    padding-bottom: 1rem;
}

.school-logo-placeholder {
    width: 60px;
    height: 60px;
    border: 2px solid var(--slate-900);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    color: var(--slate-900);
}

.report-title-block h3 {
    font-family: var(--font-header);
    font-size: 1.35rem;
    color: var(--slate-900);
    margin-bottom: 0.2rem;
}

.report-title-block p {
    font-size: 0.9rem;
    color: var(--slate-700);
}

.report-meta-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

.report-divider {
    border: none;
    border-top: 1px solid var(--slate-300);
    margin: 1.5rem 0;
}

.report-section-content h4 {
    font-family: var(--font-header);
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--slate-900);
    background-color: var(--slate-100);
    padding: 0.3rem 0.6rem;
    border-left: 3px solid var(--slate-900);
}

.report-text-p {
    font-size: 0.95rem;
    margin-bottom: 1rem;
    line-height: 1.5;
}

.report-table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
}

.report-table th, .report-table td {
    border: 1px solid var(--slate-900);
    padding: 0.6rem;
    font-size: 0.9rem;
}

.report-table th {
    background-color: var(--slate-100);
    font-family: var(--font-header);
}

.report-scores-summary {
    display: flex;
    gap: 2rem;
    justify-content: space-around;
    background-color: var(--slate-100);
    padding: 1.25rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--slate-300);
    margin: 1.5rem 0;
}

.score-box-mini {
    text-align: center;
}

.score-box-mini h5 {
    font-family: var(--font-header);
    font-size: 0.9rem;
    margin-bottom: 0.25rem;
}

.score-box-mini span {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--slate-900);
}

.report-signature-area {
    display: flex;
    justify-content: space-between;
    margin-top: 4rem;
}

.sig-block {
    text-align: center;
    width: 220px;
    font-size: 0.95rem;
}

.sig-line {
    border-bottom: 1px solid var(--slate-500);
    height: 40px;
    margin-bottom: 0.5rem;
}

/* --- FOOTER --- */
.app-footer {
    background-color: #f6efe9;
    padding: 1.5rem 0;
    text-align: center;
    border-top: 1px solid var(--slate-300);
    font-size: 0.9rem;
    color: var(--slate-500);
    margin-top: auto;
}

.app-footer p {
    margin-bottom: 0.25rem;
}


/* --- CSS PRINT CONFIGURATIONS --- */
@media print {
    body {
        background: white !important;
        color: black !important;
    }
    
    .navbar, .app-footer, .bg-decorations, .btn, .profile-setup, .section-header, .summary-cards-container {
        display: none !important;
    }
    
    .content-container {
        padding: 0 !important;
        margin: 0 !important;
        width: 100% !important;
        max-width: 100% !important;
    }
    
    .app-section {
        display: none !important;
    }
    
    #summary.app-section {
        display: block !important;
    }
    
    .report-box-wrapper {
        border: none !important;
        box-shadow: none !important;
        padding: 0 !important;
        margin: 0 !important;
        background: white !important;
    }
    
    .report-scores-summary {
        border: 1px solid black !important;
        background-color: #f1f5f9 !important;
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }
}