:root {
    --bg-dark: #0a0e17;
    --card-bg: rgba(16, 22, 37, 0.65);
    --border-color: rgba(0, 242, 254, 0.15);
    --border-glow: rgba(0, 242, 254, 0.4);
    
    --text-main: #f5f6fa;
    --text-muted: #a4b0be;
    
    --accent-cyan: #00f2fe;
    --accent-magenta: #ff007f;
    --accent-purple: #8a2be2;
    
    --color-success: #00ff87;
    --color-success-bg: rgba(0, 255, 135, 0.1);
    --color-error: #ff003c;
    --color-error-bg: rgba(255, 0, 60, 0.1);
    --color-warning: #f1c40f;
    
    --font-heading: 'Outfit', 'Sarabun', sans-serif;
    --font-body: 'Sarabun', sans-serif;
    
    --shadow-glow: 0 0 15px rgba(0, 242, 254, 0.3);
    --shadow-glow-error: 0 0 15px rgba(255, 0, 60, 0.3);
    --transition-speed: 0.3s;
}

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

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: var(--font-body);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow-x: hidden;
    position: relative;
}

/* Background Starry Animation */
#stars-container {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: 0;
    pointer-events: none;
    background-image: 
        radial-gradient(white, rgba(255,255,255,.2) 2px, transparent 40px),
        radial-gradient(white, rgba(255,255,255,.15) 1px, transparent 30px),
        radial-gradient(white, rgba(255,255,255,.1) 2px, transparent 40px);
    background-size: 550px 550px, 350px 350px, 250px 250px;
    background-position: 0 0, 40px 60px, 130px 270px;
    opacity: 0.25;
}

/* App Container */
.app-container {
    width: 100%;
    max-width: 1200px;
    padding: 20px;
    z-index: 10;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* Views & Transitions */
.view {
    width: 100%;
    animation: fadeIn 0.5s ease-out forwards;
}

.hidden {
    display: none !important;
}

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

/* Glassmorphism Card Style */
.glass-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 30px;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    transition: border-color var(--transition-speed), box-shadow var(--transition-speed);
}

.glass-card:hover {
    border-color: rgba(0, 242, 254, 0.3);
}

/* Text alignment & helpers */
.text-center { text-align: center; }
.text-accent { color: var(--accent-cyan); }
.text-warning { color: var(--color-warning); }
.text-danger { color: var(--color-error); }
.w-full { width: 100%; }
.mt-large { margin-top: 25px; }
.badge {
    background: rgba(0, 242, 254, 0.15);
    border: 1px solid var(--accent-cyan);
    color: var(--accent-cyan);
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

/* Home Screen Styling */
.hero-card {
    max-width: 600px;
    margin: 0 auto;
    padding: 50px 40px;
}

.logo-icon {
    font-size: 4rem;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-magenta));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 0 10px rgba(0, 242, 254, 0.4));
    margin-bottom: 15px;
    animation: pulse 2s infinite ease-in-out;
}

h1, h2, h3, h4 {
    font-family: var(--font-heading);
    letter-spacing: 0.5px;
}

h1 {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 5px;
    background: linear-gradient(to right, #ffffff, var(--accent-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    font-size: 1rem;
    color: var(--text-muted);
    font-weight: 400;
    margin-bottom: 25px;
}

.intro-box {
    margin-bottom: 30px;
    line-height: 1.6;
}

.description {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 20px;
    border-radius: 8px;
    font-weight: 600;
    font-family: var(--font-heading);
    cursor: pointer;
    transition: all var(--transition-speed);
    font-size: 0.9rem;
    border: none;
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, #00f2fe, #4facfe);
    color: #050505;
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.btn-glow {
    animation: glow-pulse 2s infinite alternate;
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-main);
    border: 1px solid rgba(255, 255, 255, 0.15);
}

.btn-secondary:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.3);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-icon {
    background: transparent;
    border: none;
    color: var(--text-main);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 5px;
    transition: color 0.2s;
}

.btn-icon:hover {
    color: var(--accent-cyan);
}

.action-buttons {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

/* Form Styling */
.form-group {
    margin-bottom: 25px;
    text-align: left;
    width: 100%;
}

.form-group label {
    display: block;
    font-size: 0.9rem;
    margin-bottom: 8px;
    color: var(--text-muted);
}

input[type="text"] {
    width: 100%;
    padding: 12px 16px;
    background: rgba(10, 14, 23, 0.8);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-main);
    font-family: var(--font-body);
    font-size: 1rem;
    outline: none;
    transition: all var(--transition-speed);
}

input[type="text"]:focus {
    border-color: var(--accent-cyan);
    box-shadow: 0 0 8px rgba(0, 242, 254, 0.3);
}

/* Teacher View Styling */
.card-header {
    display: flex;
    align-items: center;
    gap: 15px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
    padding-bottom: 15px;
    margin-bottom: 20px;
}

.instruction-text {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 20px;
}

.verify-result-box {
    margin-top: 25px;
    padding: 20px;
    background: rgba(0, 255, 135, 0.05);
    border: 1px solid rgba(0, 255, 135, 0.2);
    border-radius: 8px;
    animation: fadeIn 0.4s ease-out;
}

.verify-result-box.error {
    background: rgba(255, 0, 60, 0.05);
    border-color: rgba(255, 0, 60, 0.2);
}

/* Missions View Styling */
.page-header {
    text-align: center;
    margin-bottom: 35px;
}

.page-header h2 {
    font-size: 1.8rem;
    margin-bottom: 5px;
}

.page-header p {
    color: var(--text-muted);
}

.missions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 25px;
    width: 100%;
}

.mission-card {
    display: flex;
    flex-direction: column;
    height: 100%;
    cursor: pointer;
    transition: transform var(--transition-speed), border-color var(--transition-speed), box-shadow var(--transition-speed);
}

.mission-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-cyan);
    box-shadow: var(--shadow-glow);
}

.mission-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 15px;
}

.difficulty-badge {
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}

.diff-easy { background: rgba(0, 255, 135, 0.15); color: var(--color-success); border: 1px solid var(--color-success); }
.diff-medium { background: rgba(241, 196, 15, 0.15); color: var(--color-warning); border: 1px solid var(--color-warning); }
.diff-hard { background: rgba(255, 0, 60, 0.15); color: var(--color-error); border: 1px solid var(--color-error); }

.mission-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.mission-desc {
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.5;
    flex-grow: 1;
    margin-bottom: 20px;
}

.mission-card-footer {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    color: var(--text-muted);
    border-top: 1px solid rgba(255,255,255,0.06);
    padding-top: 15px;
}

/* Brief View Styling */
.brief-card {
    max-width: 750px;
    margin: 0 auto;
}

.brief-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    padding-bottom: 20px;
    margin-bottom: 20px;
}

.client-profile {
    display: flex;
    align-items: center;
    gap: 15px;
}

.client-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    color: white;
}

/* Chat container */
.chat-container {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-bottom: 25px;
}

.chat-bubble {
    display: flex;
    gap: 15px;
    align-items: flex-start;
    max-width: 85%;
}

.chat-bubble.boss {
    align-self: flex-start;
}

.chat-bubble.client {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.chat-bubble .avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(255,255,255,0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.chat-bubble.boss .avatar {
    background: rgba(0, 242, 254, 0.15);
    border: 1px solid var(--accent-cyan);
    color: var(--accent-cyan);
}

.chat-bubble.client .avatar {
    background: rgba(255, 0, 127, 0.15);
    border: 1px solid var(--accent-magenta);
    color: var(--accent-magenta);
}

.chat-bubble .message-content {
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.08);
    padding: 12px 18px;
    border-radius: 12px;
    font-size: 0.95rem;
    line-height: 1.6;
}

.chat-bubble.boss .message-content {
    border-top-left-radius: 0;
}

.chat-bubble.client .message-content {
    border-top-right-radius: 0;
    background: rgba(255, 0, 127, 0.05);
    border-color: rgba(255, 0, 127, 0.15);
}

/* Game Status Bar */
.game-status-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 25px;
    margin-bottom: 20px;
    border-radius: 12px;
    position: sticky;
    top: 15px;
    z-index: 100;
}

.status-left, .status-right {
    display: flex;
    gap: 20px;
    font-size: 0.95rem;
    font-weight: 600;
}

.user-display i, .mission-display i {
    color: var(--accent-cyan);
}

.stage-nav {
    display: flex;
    align-items: center;
    gap: 8px;
}

.stage-dot {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 0.85rem;
    color: var(--text-muted);
    transition: all var(--transition-speed);
}

.stage-dot.active {
    background: var(--accent-cyan);
    border-color: var(--accent-cyan);
    color: var(--bg-dark);
    box-shadow: var(--shadow-glow);
}

.stage-dot.completed {
    background: var(--color-success-bg);
    border-color: var(--color-success);
    color: var(--color-success);
}

.stage-line {
    width: 40px;
    height: 2px;
    background: rgba(255,255,255,0.1);
}

/* Gameplay View Shared Layout */
.level-container {
    animation: fadeIn 0.4s ease-out forwards;
}

.level-intro {
    text-align: center;
    margin-bottom: 25px;
}

.level-intro h3 {
    font-size: 1.4rem;
    color: var(--accent-cyan);
    margin-bottom: 5px;
}

.level-intro p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.level-footer {
    display: flex;
    justify-content: center;
    margin-top: 30px;
}

/* LEVEL 1: Drag & Drop Styles */
.level-1-layout {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

/* Target Tables Container */
.tables-board {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.table-card {
    background: rgba(16, 22, 37, 0.8);
    border: 1px dashed rgba(0, 242, 254, 0.3);
    border-radius: 12px;
    min-height: 200px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: all 0.2s;
}

.table-card.drag-over {
    border-color: var(--accent-cyan);
    background: rgba(0, 242, 254, 0.05);
    box-shadow: inset 0 0 10px rgba(0, 242, 254, 0.1);
}

.table-header {
    background: rgba(0, 242, 254, 0.08);
    padding: 10px 15px;
    border-bottom: 1px solid rgba(0, 242, 254, 0.15);
    font-weight: 800;
    font-family: var(--font-heading);
    letter-spacing: 0.5px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.table-body {
    padding: 15px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    gap: 8px;
    min-height: 120px;
}

/* conveyor-belt for source items */
.conveyor-belt-container {
    background: rgba(10, 14, 23, 0.5);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: 12px;
    padding: 20px;
}

.conveyor-belt-container h4 {
    margin-bottom: 12px;
    font-size: 0.95rem;
    color: var(--text-muted);
}

.conveyor-belt {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    min-height: 60px;
    padding: 5px;
    background: rgba(0,0,0,0.2);
    border-radius: 8px;
}

/* Draggable Items */
.attr-item {
    padding: 10px 15px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 6px;
    font-size: 0.85rem;
    cursor: grab;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    user-select: none;
    transition: all 0.2s;
}

.attr-item:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-1px);
}

.attr-item:active {
    cursor: grabbing;
}

.attr-item.dragging {
    opacity: 0.4;
    border-color: var(--accent-cyan);
}

.attr-item.correct {
    background: var(--color-success-bg);
    border-color: var(--color-success);
    color: var(--color-success);
}

.attr-item.incorrect {
    background: var(--color-error-bg);
    border-color: var(--color-error);
    color: var(--color-error);
    animation: shake 0.3s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

/* LEVEL 2: Data Types Configuration Table Grid */
.level-2-layout {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 25px;
}

.table-card-l2 {
    background: rgba(16, 22, 37, 0.85);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 12px;
    overflow: hidden;
}

.table-card-l2 .table-header {
    background: rgba(255, 255, 255, 0.03);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    color: var(--text-main);
}

.table-grid-l2 {
    padding: 15px;
}

.grid-row-header {
    display: grid;
    grid-template-columns: 2fr 2fr 1fr;
    gap: 10px;
    padding-bottom: 8px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 600;
    margin-bottom: 10px;
}

.grid-row-data {
    display: grid;
    grid-template-columns: 2fr 2fr 1fr;
    gap: 10px;
    align-items: center;
    margin-bottom: 8px;
}

.grid-attr-name {
    font-size: 0.85rem;
    color: var(--text-main);
}

select {
    padding: 6px 10px;
    background: rgba(10, 14, 23, 0.8);
    border: 1px solid var(--border-color);
    border-radius: 5px;
    color: var(--text-main);
    outline: none;
    font-family: var(--font-body);
    font-size: 0.8rem;
}

select:focus {
    border-color: var(--accent-cyan);
}

/* PK Key Button Toggle */
.pk-toggle {
    background: transparent;
    border: 1px solid rgba(255,255,255,0.1);
    color: var(--text-muted);
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 0.8rem;
    transition: all 0.2s;
    justify-self: center;
}

.pk-toggle.active {
    background: rgba(241, 196, 15, 0.15);
    border-color: var(--color-warning);
    color: var(--color-warning);
    box-shadow: 0 0 8px rgba(241, 196, 15, 0.3);
}

.pk-toggle:hover {
    border-color: var(--color-warning);
}

/* LEVEL 3: SVG Line Connections */
.level-3-layout-wrapper {
    position: relative;
    width: 100%;
    min-height: 450px;
    background: rgba(10, 14, 23, 0.3);
    border: 1px solid rgba(255,255,255,0.05);
    border-radius: 16px;
    padding: 30px;
    overflow: visible;
}

.svg-connections-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 15;
    overflow: visible;
}

.svg-connections-layer path {
    fill: none;
    stroke: var(--accent-cyan);
    stroke-width: 3;
    stroke-linecap: round;
    cursor: pointer;
    pointer-events: auto;
    transition: stroke 0.2s;
}

.svg-connections-layer path:hover {
    stroke: var(--accent-magenta);
}

/* Drawing Temp Line */
.svg-connections-layer path.temp-line {
    stroke: var(--accent-magenta);
    stroke-dasharray: 5, 5;
    pointer-events: none;
}

.level-3-layout {
    display: flex;
    justify-content: space-around;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 40px;
    position: relative;
    z-index: 10;
}

.table-card-l3 {
    background: rgba(16, 22, 37, 0.9);
    border: 1px solid rgba(0, 242, 254, 0.2);
    border-radius: 12px;
    width: 250px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0,0,0,0.4);
}

.table-card-l3 .table-header {
    background: rgba(0, 242, 254, 0.05);
    border-bottom: 1px solid rgba(0, 242, 254, 0.15);
}

.table-body-l3 {
    padding: 10px 0;
}

.column-row-l3 {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 15px;
    position: relative;
    font-size: 0.85rem;
}

.column-row-l3:hover {
    background: rgba(255,255,255,0.02);
}

.column-name-l3 {
    font-family: monospace;
    font-weight: 600;
}

.column-type-l3 {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-left: 8px;
}

/* Connect Nodes */
.connect-node {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 20;
    transition: all 0.2s;
    border: 1px solid rgba(255,255,255,0.3);
}

/* PK Node (Out node) */
.connect-node.node-pk {
    background: #f1c40f;
    border-color: #ffffff;
    box-shadow: 0 0 5px rgba(241, 196, 15, 0.6);
}

/* FK Node (In node) */
.connect-node.node-fk {
    background: #95a5a6;
    border-color: #ffffff;
    box-shadow: 0 0 5px rgba(149, 165, 166, 0.6);
}

.connect-node:hover {
    transform: scale(1.3);
}

.connect-node.active-origin {
    animation: pulse 1.2s infinite ease-in-out;
    background: var(--accent-magenta) !important;
    box-shadow: 0 0 10px var(--accent-magenta);
}

.level-3-controls {
    display: flex;
    gap: 15px;
}

/* Result / Finish Card */
.result-card {
    max-width: 650px;
    margin: 0 auto;
    padding: 40px 30px;
}

.trophy-icon {
    font-size: 4.5rem;
    color: var(--color-warning);
    filter: drop-shadow(0 0 15px rgba(241, 196, 15, 0.4));
    margin-bottom: 15px;
    animation: trophy-bounce 2.5s infinite ease-in-out;
}

.result-details {
    margin: 25px 0;
    padding: 20px;
    background: rgba(255,255,255,0.02);
    border-color: rgba(255,255,255,0.06);
}

.result-row {
    display: flex;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px solid rgba(255,255,255,0.04);
}

.result-row:last-child {
    border-bottom: none;
}

.font-large {
    font-size: 1.1rem;
}

.verification-hash-box {
    margin-top: 25px;
    padding: 15px;
    background: rgba(10, 14, 23, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 8px;
    text-align: left;
}

.hash-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.hash-code-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(0,0,0,0.4);
    padding: 10px 12px;
    border-radius: 6px;
    border: 1px solid rgba(0, 242, 254, 0.1);
}

.hash-code-wrapper code {
    font-family: monospace;
    color: var(--accent-cyan);
    font-size: 0.85rem;
    word-break: break-all;
    user-select: all;
}

.btn-copy {
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    color: var(--text-main);
    padding: 5px 10px;
    border-radius: 4px;
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-copy:hover {
    background: rgba(0, 242, 254, 0.15);
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
}

.hash-help {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 8px;
}

/* Toast Notifications */
.notification-toast {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: rgba(10, 14, 23, 0.95);
    border: 1.5px solid var(--accent-cyan);
    border-radius: 8px;
    color: var(--text-main);
    padding: 15px 25px;
    font-size: 0.9rem;
    box-shadow: 0 5px 25px rgba(0,0,0,0.5);
    z-index: 100;
    display: flex;
    align-items: center;
    gap: 10px;
    animation: slideIn 0.3s ease-out forwards;
}

.notification-toast.error {
    border-color: var(--color-error);
}

.notification-toast.success {
    border-color: var(--color-success);
}

@keyframes slideIn {
    from { transform: translateX(120%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* General Keyframe Animations */
@keyframes glow-pulse {
    from { box-shadow: 0 0 5px rgba(0, 242, 254, 0.2); }
    to { box-shadow: 0 0 15px rgba(0, 242, 254, 0.5); }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.08); opacity: 0.8; }
}

@keyframes trophy-bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

/* Modal Backdrop and Card Styles */
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(5, 7, 12, 0.8);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 250; /* วางทับเลเยอร์เชื่อมความสัมพันธ์ SVG */
    animation: fadeIn 0.2s ease-out forwards;
}

.modal-backdrop.hidden {
    display: none !important;
}

.modal-card {
    width: 90%;
    max-width: 600px;
    padding: 25px;
    border: 1px solid rgba(0, 242, 254, 0.3);
    box-shadow: 0 0 30px rgba(0, 242, 254, 0.2);
    animation: slideUp 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    padding-bottom: 15px;
    margin-bottom: 15px;
}

.modal-header h3 {
    font-size: 1.2rem;
    font-weight: 600;
}

@keyframes slideUp {
    from { transform: translateY(30px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

/* Hidden Certificate Template for Export */
.cert-pdf-template {
    position: absolute;
    top: -9999px;
    left: -9999px;
    width: 1000px; /* สัดส่วน A4 แนวนอน */
    height: 707px;
    background-color: #0a0e17;
    color: #f5f6fa;
    font-family: 'Sarabun', 'Outfit', sans-serif;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    box-sizing: border-box;
    padding: 30px;
}

.cert-border-outer {
    border: 5px solid #f1c40f;
    width: 100%;
    height: 100%;
    box-sizing: border-box;
    padding: 10px;
    display: flex;
}

.cert-border-inner {
    border: 2px solid rgba(241, 196, 15, 0.4);
    width: 100%;
    height: 100%;
    box-sizing: border-box;
    padding: 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    text-align: center;
    background: radial-gradient(circle at center, rgba(16, 22, 37, 0.9) 0%, rgba(10, 14, 23, 1) 100%);
}

.cert-header {
    font-family: 'Outfit', sans-serif;
    font-size: 2.2rem;
    font-weight: 800;
    color: #f1c40f;
    letter-spacing: 2px;
    margin-bottom: 5px;
    text-shadow: 0 0 10px rgba(241, 196, 15, 0.2);
}

.cert-subtitle {
    font-size: 1.1rem;
    color: #a4b0be;
    margin-bottom: 20px;
}

.cert-award {
    font-size: 1.1rem;
    color: #f5f6fa;
    margin-bottom: 10px;
}

.cert-name {
    font-size: 2.4rem;
    font-weight: 700;
    color: #00f2fe;
    margin-bottom: 15px;
    border-bottom: 1.5px solid rgba(0, 242, 254, 0.3);
    padding-bottom: 5px;
    width: 60%;
    text-align: center;
}

.cert-description {
    font-size: 0.95rem;
    color: #a4b0be;
    line-height: 1.6;
    margin-bottom: 10px;
}

.cert-mission {
    font-size: 1.25rem;
    font-weight: 600;
    color: #f1c40f;
    margin-bottom: 25px;
}

.cert-score-box {
    display: flex;
    justify-content: space-around;
    background: rgba(16, 22, 37, 0.85);
    border: 1px solid rgba(0, 242, 254, 0.2);
    border-radius: 8px;
    padding: 15px 30px;
    width: 60%;
    margin-bottom: 20px;
}

.cert-score-item {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.cert-score-item .label {
    font-size: 0.8rem;
    color: #a4b0be;
}

.cert-score-item .value {
    font-size: 1.1rem;
    font-weight: 700;
    color: #00f2fe;
}

.cert-footer {
    display: flex;
    justify-content: space-between;
    width: 100%;
    font-size: 0.75rem;
    color: #747d8c;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding-top: 15px;
}

.cert-hash {
    font-family: monospace;
}

/* Responsive Overrides */
@media (max-width: 768px) {
    .app-container {
        padding: 10px;
    }
    .game-status-bar {
        flex-direction: column;
        gap: 10px;
        align-items: center;
        padding: 15px;
    }
    .action-buttons {
        flex-direction: column;
    }
    .grid-row-header, .grid-row-data {
        grid-template-columns: 1.5fr 1.5fr 0.5fr;
    }
}

/* User Manual Tab Styling */
.tab-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 0.95rem;
    padding: 8px 16px;
    cursor: pointer;
    transition: all 0.3s ease;
    border-bottom: 2px solid transparent;
    display: flex;
    align-items: center;
    gap: 8px;
}

.tab-btn:hover {
    color: var(--accent-cyan);
}

.tab-btn.active-tab {
    color: var(--accent-cyan);
    border-bottom: 2px solid var(--accent-cyan);
    font-weight: 600;
}

.manual-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding-bottom: 0px;
}