/* ============================================================
   EV Seminar Registration System - Presentation Slides CSS
   ============================================================ */

:root {
    --primary-color: #00D4FF;
    --primary-dark: #0099BB;
    --accent-color: #4ECDC4;
    --danger-color: #FF6B6B;
    --text-dark: #1a1a1a;
    --text-light: #666666;
    --bg-light: #f5f7fa;
    --bg-white: #ffffff;
    --border-color: #e0e0e0;
}

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

html, body {
    width: 100%;
    height: 100%;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    overflow: hidden;
}

/* ============================================================
   PRESENTATION CONTAINER
   ============================================================ */

.presentation-container {
    width: 100%;
    height: 100%;
    position: relative;
    perspective: 1000px;
}

.slide {
    width: 100%;
    height: 100%;
    aspect-ratio: 16 / 9;
    position: absolute;
    top: 0;
    left: 0;
    display: flex;
    flex-direction: column;
    background: linear-gradient(135deg, var(--bg-white) 0%, #f0f9ff 100%);
    opacity: 0;
    visibility: hidden;
    transition: all 0.6s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    transform: translateX(100px) rotateY(30deg);
    z-index: 1;
}

.slide.active {
    opacity: 1;
    visibility: visible;
    transform: translateX(0) rotateY(0);
    z-index: 10;
}

.slide.prev {
    transform: translateX(-100px) rotateY(-30deg);
}

/* ============================================================
   SLIDE HEADER
   ============================================================ */

.slide-header {
    padding: 40px 60px 20px;
    background: linear-gradient(90deg, var(--primary-color) 0%, var(--accent-color) 100%);
    color: white;
}

.slide-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.header-line {
    height: 4px;
    width: 80px;
    background: white;
    border-radius: 2px;
    margin-top: 10px;
}

/* ============================================================
   SLIDE CONTENT
   ============================================================ */

.slide-content {
    flex: 1;
    padding: 40px 60px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

/* Scrollbar styling */
.slide-content::-webkit-scrollbar {
    width: 8px;
}

.slide-content::-webkit-scrollbar-track {
    background: var(--bg-light);
}

.slide-content::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

/* ============================================================
   SLIDE 1: TITLE SLIDE
   ============================================================ */

#slide-1 {
    background: linear-gradient(135deg, #00D4FF 0%, #4ECDC4 100%);
    justify-content: center;
    align-items: center;
    position: relative;
    overflow: hidden;
}

#slide-1 .slide-content {
    padding: 0;
    align-items: center;
    justify-content: center;
}

.title-slide-background {
    position: absolute;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.decoration {
    position: absolute;
    width: 200px;
    height: 200px;
    opacity: 0.1;
}

.decoration.top-left {
    top: -50px;
    left: -50px;
}

.decoration.bottom-right {
    bottom: -50px;
    right: -50px;
}

.title-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: white;
}

.main-title {
    font-size: 4rem;
    font-weight: 800;
    margin-bottom: 15px;
    text-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
    animation: slideInDown 0.8s ease-out;
}

.subtitle {
    font-size: 1.8rem;
    font-weight: 300;
    margin-bottom: 10px;
    opacity: 0.95;
    animation: slideInUp 0.8s ease-out 0.2s both;
}

.course-code {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 30px;
    opacity: 0.9;
    animation: slideInUp 0.8s ease-out 0.4s both;
}

.date-badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.25);
    color: white;
    padding: 12px 30px;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: 600;
    backdrop-filter: blur(10px);
    animation: slideInUp 0.8s ease-out 0.6s both;
}

/* ============================================================
   TITLE SLIDE ANIMATIONS
   ============================================================ */

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

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

/* ============================================================
   OVERVIEW SECTION (SLIDE 2)
   ============================================================ */

.overview-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 25px;
    margin-bottom: 30px;
}

.overview-item {
    background: white;
    border-radius: 12px;
    padding: 25px;
    text-align: center;
    box-shadow: 0 4px 12px rgba(0, 212, 255, 0.1);
    transition: all 0.3s ease;
}

.overview-item:hover {
    transform: translateY(-8px);
    box-shadow: 0 8px 24px rgba(0, 212, 255, 0.15);
}

.icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 15px;
    display: block;
}

.overview-item h3 {
    font-size: 1.4rem;
    color: var(--text-dark);
    margin-bottom: 10px;
}

.overview-item p {
    font-size: 1rem;
    color: var(--text-light);
    line-height: 1.5;
}

.feature-highlights {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.feature-tag {
    background: linear-gradient(90deg, var(--primary-color) 0%, var(--accent-color) 100%);
    color: white;
    padding: 10px 20px;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
}

/* ============================================================
   PROBLEM & SOLUTION (SLIDE 3)
   ============================================================ */

.problem-solution {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-bottom: 30px;
}

.problem-box,
.solution-box {
    background: white;
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.problem-box {
    border-left: 6px solid var(--danger-color);
}

.solution-box {
    border-left: 6px solid var(--accent-color);
}

.icon-large {
    width: 80px;
    height: 80px;
    margin: 0 auto 15px;
    display: block;
}

.problem-box h3,
.solution-box h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.problem-box ul,
.solution-box ul {
    list-style: none;
    margin: 0;
}

.problem-box li,
.solution-box li {
    padding: 8px 0;
    font-size: 1rem;
    color: var(--text-light);
    border-bottom: 1px solid var(--border-color);
}

.problem-box li:last-child,
.solution-box li:last-child {
    border-bottom: none;
}

.business-value {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.value-item {
    background: linear-gradient(135deg, #f0f9ff 0%, #f5f7fa 100%);
    border-radius: 8px;
    padding: 20px;
    text-align: center;
}

.value-icon {
    font-size: 2.5rem;
    display: block;
    margin-bottom: 10px;
}

.value-item p {
    font-size: 1rem;
    color: var(--text-dark);
    line-height: 1.5;
}

/* ============================================================
   ARCHITECTURE (SLIDE 4)
   ============================================================ */

.architecture-diagram {
    display: grid;
    grid-template-columns: 1fr 0.3fr 1fr;
    gap: 20px;
    margin-bottom: 30px;
    align-items: center;
}

.architecture-layer {
    background: white;
    border-radius: 12px;
    padding: 25px;
    text-align: center;
    box-shadow: 0 4px 12px rgba(0, 212, 255, 0.1);
}

.layer-icon {
    width: 100%;
    max-width: 80px;
    margin: 0 auto 15px;
    display: block;
}

.frontend-layer {
    border-top: 4px solid var(--primary-color);
}

.backend-layer {
    border-top: 4px solid var(--accent-color);
}

.architecture-layer h3 {
    font-size: 1.3rem;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.architecture-layer p {
    font-size: 0.95rem;
    color: var(--text-light);
}

.small-text {
    font-size: 0.9rem;
    color: #999;
}

.api-bridge {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

.api-bridge svg {
    width: 60px;
    height: 60px;
}

.bridge-text {
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-top: 10px;
}

.database-info {
    background: linear-gradient(135deg, #f0f9ff 0%, #f5f7fa 100%);
    border-left: 4px solid var(--primary-color);
    padding: 20px;
    border-radius: 8px;
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.db-icon {
    width: 60px;
    height: 60px;
    flex-shrink: 0;
}

.database-info p {
    font-size: 1rem;
    color: var(--text-dark);
    margin: 5px 0;
}

/* ============================================================
   TECH STACK GRID (SLIDES 5-6)
   ============================================================ */

.tech-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 25px;
}

.tech-card {
    background: white;
    border-radius: 12px;
    padding: 20px;
    text-align: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border-top: 3px solid transparent;
}

.tech-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 8px 20px rgba(0, 212, 255, 0.15);
    border-top-color: var(--primary-color);
}

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

.tech-icon {
    width: 50px;
    height: 50px;
    margin-bottom: 10px;
    display: block;
}

.tech-card h3 {
    font-size: 1rem;
    color: var(--text-light);
    font-weight: 500;
}

.tech-card p {
    font-size: 1.1rem;
    color: var(--text-dark);
    font-weight: 600;
    margin: 10px 0 5px;
}

.tech-desc {
    font-size: 0.95rem;
    color: var(--text-light);
    font-weight: normal;
}

.pages-highlight,
.endpoints-highlight {
    background: linear-gradient(135deg, #f0f9ff 0%, #f5f7fa 100%);
    border-left: 4px solid var(--primary-color);
    padding: 20px;
    border-radius: 8px;
}

.pages-highlight h4,
.endpoints-highlight h4 {
    font-size: 1.2rem;
    color: var(--text-dark);
    margin-bottom: 15px;
}

.pages-list,
.features-list {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.page-item,
.feature-badge {
    background: white;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.95rem;
    font-weight: 600;
}

.feature-badge {
    background: var(--primary-color);
    color: white;
    border: none;
}

/* ============================================================
   DATABASE SCHEMA (SLIDE 7)
   ============================================================ */

.database-schema {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 25px;
}

.entity-group {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

.entity-box {
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    border-top: 4px solid var(--primary-color);
}

.entity-header {
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    color: white;
    padding: 15px;
    font-weight: 700;
    font-size: 1.1rem;
}

.entity-body {
    padding: 15px;
}

.entity-body p {
    font-size: 0.95rem;
    color: var(--text-dark);
    margin: 5px 0;
    font-family: 'Courier New', monospace;
}

.relationships {
    background: linear-gradient(135deg, #f0f9ff 0%, #f5f7fa 100%);
    border-left: 4px solid var(--accent-color);
    padding: 20px;
    border-radius: 8px;
}

.relationships p {
    font-size: 1.1rem;
    color: var(--text-dark);
    font-weight: 600;
    margin-bottom: 10px;
}

.relationships ul {
    list-style: none;
    margin: 0;
}

.relationships li {
    font-size: 1rem;
    color: var(--text-light);
    padding: 5px 0 5px 20px;
    position: relative;
}

.relationships li:before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-weight: 700;
}

/* ============================================================
   FEATURES GRID (SLIDES 8-9)
   ============================================================ */

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 20px;
}

.feature-card {
    background: white;
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border-top: 4px solid var(--primary-color);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 8px 24px rgba(0, 212, 255, 0.15);
}

.feature-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 15px;
    display: block;
}

.feature-card h3 {
    font-size: 1.2rem;
    color: var(--text-dark);
    margin-bottom: 15px;
    font-weight: 700;
}

.feature-card ul {
    list-style: none;
    margin: 0;
}

.feature-card li {
    font-size: 0.95rem;
    color: var(--text-light);
    padding: 6px 0 6px 20px;
    position: relative;
}

.feature-card li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-weight: 700;
}

/* ============================================================
   ADMIN FEATURES (SLIDE 9)
   ============================================================ */

.admin-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 25px;
}

.admin-feature-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.admin-feature {
    background: white;
    border-radius: 12px;
    padding: 20px;
    text-align: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border-left: 4px solid var(--danger-color);
}

.admin-feature:hover {
    transform: translateY(-6px);
}

.admin-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 12px;
    display: block;
}

.admin-feature h4 {
    font-size: 1.1rem;
    color: var(--text-dark);
    margin-bottom: 8px;
    font-weight: 700;
}

.admin-feature p {
    font-size: 0.95rem;
    color: var(--text-light);
}

.admin-capabilities {
    background: linear-gradient(135deg, #f0f9ff 0%, #f5f7fa 100%);
    border-left: 4px solid var(--danger-color);
    padding: 20px;
    border-radius: 8px;
}

.admin-capabilities h4 {
    font-size: 1.2rem;
    color: var(--text-dark);
    margin-bottom: 15px;
}

.capabilities-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.capability {
    font-size: 1rem;
    color: var(--text-dark);
    padding: 8px 12px;
}

/* ============================================================
   ENDPOINTS TABLE (SLIDE 10)
   ============================================================ */

.endpoints-table {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 25px;
}

.endpoint-section {
    background: white;
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.endpoint-section h4 {
    font-size: 1.1rem;
    color: var(--text-dark);
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary-color);
    font-weight: 700;
}

.endpoint-item {
    display: flex;
    gap: 10px;
    margin-bottom: 12px;
    align-items: center;
}

.method {
    display: inline-block;
    width: 50px;
    padding: 6px;
    border-radius: 4px;
    font-size: 0.85rem;
    font-weight: 700;
    text-align: center;
    color: white;
}

.method.get {
    background: #61AFFE;
}

.method.post {
    background: #49CC90;
}

.method.put {
    background: #FCA130;
}

.endpoint-path {
    font-family: 'Courier New', monospace;
    font-size: 0.95rem;
    color: var(--primary-color);
    font-weight: 600;
}

.endpoint-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.stat-item {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    color: white;
    padding: 25px;
    border-radius: 12px;
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 8px;
}

.stat-label {
    display: block;
    font-size: 1rem;
    font-weight: 600;
}

/* ============================================================
   FLOW DIAGRAMS (SLIDES 11-12)
   ============================================================ */

.flow-diagram {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
    margin-bottom: 30px;
}

.flow-step {
    background: white;
    border-radius: 12px;
    padding: 20px;
    text-align: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    position: relative;
}

.flow-step.final {
    background: linear-gradient(135deg, var(--accent-color) 0%, #45b7a8 100%);
    color: white;
}

.step-circle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    border-radius: 50%;
    margin: 0 auto 12px;
    font-size: 1.5rem;
    font-weight: 700;
}

.flow-step h4 {
    font-size: 1.1rem;
    color: var(--text-dark);
    margin-bottom: 8px;
    font-weight: 700;
}

.flow-step.final h4 {
    color: white;
}

.flow-step p {
    font-size: 0.95rem;
    color: var(--text-light);
    line-height: 1.4;
}

.flow-step.final p {
    color: rgba(255, 255, 255, 0.9);
}

.flow-arrow {
    width: 100%;
    height: 40px;
    margin: 10px 0;
}

.check-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 12px;
    display: block;
}

.registration-details {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.detail-box {
    background: linear-gradient(135deg, #f0f9ff 0%, #f5f7fa 100%);
    border-left: 4px solid var(--primary-color);
    padding: 20px;
    border-radius: 8px;
}

.detail-box h5 {
    font-size: 1.1rem;
    color: var(--text-dark);
    margin-bottom: 12px;
    font-weight: 700;
}

.detail-box ul {
    list-style: none;
}

.detail-box li {
    font-size: 0.95rem;
    color: var(--text-light);
    padding: 6px 0 6px 20px;
    position: relative;
}

.detail-box li:before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: 700;
}

/* ============================================================
   WORKFLOW STEPS (SLIDE 12)
   ============================================================ */

.workflow-steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 25px;
}

.workflow-item {
    background: white;
    border-radius: 12px;
    padding: 20px;
    text-align: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.workflow-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 45px;
    height: 45px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    border-radius: 50%;
    margin: 0 auto 12px;
    font-size: 1.3rem;
    font-weight: 700;
}

.workflow-item h4 {
    font-size: 1.1rem;
    color: var(--text-dark);
    margin-bottom: 8px;
    font-weight: 700;
}

.workflow-item p {
    font-size: 0.95rem;
    color: var(--text-light);
}

.step-icon {
    width: 50px;
    height: 50px;
    margin: 10px auto;
    display: block;
}

.email-notifications {
    background: linear-gradient(135deg, #f0f9ff 0%, #f5f7fa 100%);
    border-left: 4px solid var(--primary-color);
    padding: 20px;
    border-radius: 8px;
}

.email-notifications h4 {
    font-size: 1.1rem;
    color: var(--text-dark);
    margin-bottom: 15px;
    font-weight: 700;
}

.notification-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
}

.notification {
    background: white;
    padding: 15px;
    border-radius: 8px;
    border-left: 3px solid var(--primary-color);
}

.notif-type {
    display: block;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 5px;
    font-size: 1rem;
}

.notification p {
    font-size: 0.9rem;
    color: var(--text-light);
}

/* ============================================================
   SECURITY GRID (SLIDE 13)
   ============================================================ */

.security-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.security-item {
    background: white;
    border-radius: 12px;
    padding: 20px;
    text-align: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border-top: 4px solid var(--accent-color);
}

.security-item:hover {
    transform: translateY(-6px);
}

.security-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 12px;
    display: block;
}

.security-item h4 {
    font-size: 1.1rem;
    color: var(--text-dark);
    margin-bottom: 8px;
    font-weight: 700;
}

.security-item p {
    font-size: 0.95rem;
    color: var(--text-light);
}

/* ============================================================
   DEPLOYMENT (SLIDE 14)
   ============================================================ */

.deployment-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-bottom: 25px;
}

.deployment-section h3 {
    font-size: 1.4rem;
    color: var(--text-dark);
    margin-bottom: 15px;
    font-weight: 700;
}

.setup-box {
    background: linear-gradient(135deg, #f0f9ff 0%, #f5f7fa 100%);
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 12px;
    border-left: 3px solid var(--primary-color);
}

.setup-box p,
.setup-box strong {
    font-size: 1rem;
    color: var(--text-dark);
}

.setup-box ul {
    list-style: none;
    margin: 8px 0 0;
}

.setup-box li {
    font-size: 0.95rem;
    color: var(--text-light);
    padding: 4px 0 4px 15px;
    position: relative;
}

.setup-box li:before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--primary-color);
}

.setup-box pre {
    background: white;
    padding: 10px;
    border-radius: 4px;
    margin-top: 8px;
    border: 1px solid var(--border-color);
}

.setup-box code {
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    color: var(--primary-color);
}

.environment-config,
.database-setup {
    background: white;
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    margin-bottom: 20px;
}

.environment-config h4,
.database-setup h4 {
    font-size: 1.2rem;
    color: var(--text-dark);
    margin-bottom: 15px;
    font-weight: 700;
}

.config-item {
    margin-bottom: 15px;
}

.config-item p {
    font-size: 1rem;
    color: var(--text-dark);
    margin-bottom: 8px;
    font-weight: 600;
}

.seed-data {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
}

.seed-data span {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    color: white;
    padding: 10px;
    border-radius: 6px;
    text-align: center;
    font-size: 0.95rem;
    font-weight: 600;
}

/* ============================================================
   CHALLENGES & SOLUTIONS (SLIDE 15)
   ============================================================ */

.challenges-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.challenge-item {
    background: white;
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    border-top: 4px solid var(--danger-color);
}

.challenge-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 15px;
}

.challenge-icon {
    width: 45px;
    height: 45px;
    flex-shrink: 0;
}

.challenge-header h4 {
    font-size: 1.1rem;
    color: var(--text-dark);
    margin: 0;
    font-weight: 700;
}

.challenge-item p {
    font-size: 0.95rem;
    color: var(--text-light);
    margin: 8px 0;
    line-height: 1.5;
}

.challenge-item strong {
    color: var(--text-dark);
}

/* ============================================================
   ACHIEVEMENTS (SLIDE 16)
   ============================================================ */

.achievements-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.achievement-card {
    background: white;
    border-radius: 12px;
    padding: 25px;
    text-align: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border-top: 4px solid var(--primary-color);
}

.achievement-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 8px 24px rgba(0, 212, 255, 0.15);
}

.achievement-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 15px;
    display: block;
}

.achievement-card h4 {
    font-size: 1.2rem;
    color: var(--text-dark);
    margin-bottom: 8px;
    font-weight: 700;
}

.achievement-card p {
    font-size: 0.95rem;
    color: var(--text-light);
}

/* ============================================================
   ENHANCEMENTS (SLIDE 17)
   ============================================================ */

.enhancements-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.enhancement-item {
    background: white;
    border-radius: 12px;
    padding: 20px;
    text-align: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border-top: 3px solid var(--primary-color);
}

.enhancement-item:hover {
    transform: translateY(-6px);
}

.enh-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 12px;
    display: block;
}

.enhancement-item h4 {
    font-size: 1.1rem;
    color: var(--text-dark);
    margin-bottom: 8px;
    font-weight: 700;
}

.enhancement-item p {
    font-size: 0.95rem;
    color: var(--text-light);
}

/* ============================================================
   CONCLUSION & TEAM (SLIDE 18)
   ============================================================ */

.conclusion-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 25px;
}

.summary-box,
.outcomes-box {
    background: white;
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.summary-box {
    border-left: 4px solid var(--primary-color);
}

.outcomes-box {
    border-left: 4px solid var(--accent-color);
}

.summary-box h3,
.outcomes-box h3 {
    font-size: 1.3rem;
    color: var(--text-dark);
    margin-bottom: 15px;
    font-weight: 700;
}

.summary-box ul,
.outcomes-box ul {
    list-style: none;
}

.summary-box li,
.outcomes-box li {
    font-size: 1rem;
    color: var(--text-light);
    padding: 8px 0 8px 25px;
    position: relative;
    line-height: 1.5;
}

.summary-box li:before,
.outcomes-box li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: 700;
    font-size: 1.1rem;
}

.team-section {
    grid-column: span 2;
    background: linear-gradient(135deg, #f0f9ff 0%, #f5f7fa 100%);
    border-radius: 12px;
    padding: 25px;
}

.team-section h3 {
    font-size: 1.3rem;
    color: var(--text-dark);
    margin-bottom: 20px;
    font-weight: 700;
}

.team-members {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 15px;
}

.member {
    background: white;
    border-radius: 10px;
    padding: 15px;
    text-align: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

.member:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 12px rgba(0, 212, 255, 0.1);
}

.member-avatar {
    font-size: 2rem;
    margin-bottom: 10px;
}

.member-name {
    font-size: 0.95rem;
    color: var(--text-dark);
    font-weight: 700;
    margin-bottom: 4px;
}

.member-id {
    font-size: 0.85rem;
    color: var(--text-light);
    font-family: 'Courier New', monospace;
}

.qa-box {
    grid-column: span 2;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    color: white;
    border-radius: 12px;
    padding: 25px;
    text-align: center;
}

.qa-box p {
    font-size: 1.2rem;
    font-weight: 600;
    margin: 8px 0;
}

/* ============================================================
   CONTROLS & NAVIGATION
   ============================================================ */

.controls {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 30px;
    align-items: center;
    z-index: 100;
    background: rgba(255, 255, 255, 0.95);
    padding: 15px 30px;
    border-radius: 50px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
    backdrop-filter: blur(10px);
}

.nav-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    border: none;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    font-size: 1.5rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(0, 212, 255, 0.3);
}

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

.slide-counter {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-dark);
    min-width: 60px;
    text-align: center;
}

/* ============================================================
   PROGRESS BAR
   ============================================================ */

.progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--border-color);
    z-index: 50;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    width: 0%;
    transition: width 0.6s ease;
}

/* ============================================================
   ANIMATIONS
   ============================================================ */

@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInBottom {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================================
   RESPONSIVE ADJUSTMENTS
   ============================================================ */

@media (max-width: 1920px) {
    .slide-header h2 {
        font-size: 2.2rem;
    }
    
    .slide-content {
        padding: 30px 50px;
    }
}

@media (max-width: 1440px) {
    .overview-grid,
    .tech-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .database-schema {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ============================================================
   KEYBOARD SUPPORT
   ============================================================ */

.nav-btn:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}