/* ========================================
   CEO AI MENTOR - PRESENTATION STYLES
   UX Expert Edition - Professional Design
   ======================================== */

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    overflow: hidden;
    background: #000;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Presentation Container */
.presentation-container {
    width: 100vw;
    height: 100vh;
    position: relative;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    overflow: hidden;
}

/* Session Header */
.session-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 80px;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(20px);
    border-bottom: 2px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 3rem;
    z-index: 100;
}

.session-info {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.session-number {
    font-size: 1.1rem;
    font-weight: 700;
    color: #fbbf24;
    text-transform: uppercase;
    letter-spacing: 1px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

.session-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: #ffffff;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

.session-progress {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.2rem;
    font-weight: 700;
    color: #ffffff;
}

.counter-separator {
    color: rgba(255, 255, 255, 0.5);
    margin: 0 0.25rem;
}

/* Progress Bar */
.progress-container {
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    height: 4px;
    background: rgba(0, 0, 0, 0.3);
    z-index: 100;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, #fbbf24 0%, #f59e0b 100%);
    transition: width 0.3s ease;
    box-shadow: 0 0 15px rgba(251, 191, 36, 0.6);
}

/* Slides Container */
.slides-container {
    position: absolute;
    top: 84px;
    left: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
}

.slide {
    position: absolute;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.5s ease, visibility 0.5s ease;
    background: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 50%, #2563eb 100%);
    padding: 4rem;
}

.slide.active {
    opacity: 1;
    visibility: visible;
}

/* Slide Content */
.slide-content {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
}

/* Title Slide */
.title-slide {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 4rem;
}

.title-container {
    flex: 1;
}

.main-title {
    font-size: 4.5rem;
    font-weight: 900;
    color: #ffffff;
    margin-bottom: 1.5rem;
    letter-spacing: -2px;
    text-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
}

.subtitle {
    font-size: 2.5rem;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 2rem;
    text-shadow: 0 3px 8px rgba(0, 0, 0, 0.4);
}

.title-divider {
    width: 100px;
    height: 5px;
    background: linear-gradient(90deg, #fbbf24 0%, #f59e0b 100%);
    margin: 2rem 0;
    border-radius: 3px;
    box-shadow: 0 2px 8px rgba(251, 191, 36, 0.5);
}

.presentation-description {
    font-size: 1.6rem;
    color: #fbbf24;
    font-weight: 600;
    margin-bottom: 3rem;
    text-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
}

.presenter-info p {
    font-size: 1.2rem;
    color: #e0e7ff;
    margin-bottom: 0.75rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.title-visual {
    flex-shrink: 0;
}

.ai-icon {
    width: 200px;
    height: 200px;
    background: linear-gradient(135deg, rgba(251, 191, 36, 0.25) 0%, rgba(251, 191, 36, 0.15) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 6rem;
    color: #fbbf24;
    border: 3px solid rgba(251, 191, 36, 0.3);
    box-shadow: 0 20px 60px rgba(251, 191, 36, 0.4);
    animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

/* Regular Slide Title */
.slide-title {
    font-size: 3.5rem;
    font-weight: 800;
    color: #ffffff;
    margin-bottom: 3rem;
    text-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
}

/* Navigation Controls */
.nav-controls {
    position: fixed;
    bottom: 3rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 2rem;
    z-index: 100;
}

.nav-btn {
    width: 60px;
    height: 60px;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ffffff;
    font-size: 1.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.nav-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    border-color: rgba(251, 191, 36, 0.5);
    transform: scale(1.1);
}

.nav-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

/* Fullscreen Button */
.fullscreen-btn {
    position: fixed;
    top: 100px;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ffffff;
    font-size: 1.2rem;
    cursor: pointer;
    transition: all 0.3s ease;
    z-index: 100;
}

.fullscreen-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    border-color: rgba(251, 191, 36, 0.5);
    transform: scale(1.05);
}

/* Session Navigation */
.session-nav {
    position: fixed;
    top: 100px;
    left: 2rem;
    z-index: 100;
}

.session-nav-btn {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1.5rem;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 12px;
    color: #ffffff;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
}

.session-nav-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    border-color: rgba(251, 191, 36, 0.5);
    transform: translateY(-2px);
}

/* Keyboard Hint */
.keyboard-hint {
    position: fixed;
    bottom: 1rem;
    left: 50%;
    transform: translateX(-50%);
    padding: 0.75rem 1.5rem;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(10px);
    border-radius: 8px;
    color: #e0e7ff;
    font-size: 0.9rem;
    z-index: 100;
}

/* Thank You Slide */
.thank-you-slide {
    text-align: center;
}

.thank-you-content {
    max-width: 900px;
    margin: 0 auto;
}

.thank-you-title {
    font-size: 4rem;
    font-weight: 800;
    color: #ffffff;
    margin-bottom: 2rem;
    text-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
}

.thank-you-divider {
    width: 150px;
    height: 5px;
    background: linear-gradient(90deg, #fbbf24 0%, #f59e0b 100%);
    margin: 0 auto 2rem;
    border-radius: 3px;
}

.thank-you-message {
    font-size: 1.8rem;
    color: #fbbf24;
    margin-bottom: 4rem;
    text-shadow: 0 2px 6px rgba(0, 0, 0, 0.4);
}

.session-preview {
    background: rgba(255, 255, 255, 0.12);
    backdrop-filter: blur(10px);
    padding: 2.5rem;
    border-radius: 20px;
    border: 2px solid rgba(255, 255, 255, 0.2);
    margin-bottom: 3rem;
}

.session-preview h3 {
    font-size: 1.8rem;
    color: #ffffff;
    margin-bottom: 1rem;
    text-shadow: 0 3px 8px rgba(0, 0, 0, 0.4);
}

.session-preview h4 {
    font-size: 2.2rem;
    color: #fbbf24;
    margin-bottom: 2rem;
    text-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
}

.preview-topics {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
}

.topic-tag {
    padding: 0.75rem 1.5rem;
    background: rgba(251, 191, 36, 0.2);
    border: 2px solid rgba(251, 191, 36, 0.4);
    border-radius: 25px;
    color: #fbbf24;
    font-weight: 600;
    font-size: 1rem;
}

.session-actions {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    margin-bottom: 3rem;
}

.next-session-btn,
.all-sessions-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1.25rem 2.5rem;
    border-radius: 12px;
    font-size: 1.2rem;
    font-weight: 700;
    text-decoration: none;
    transition: all 0.3s ease;
}

.next-session-btn {
    background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
    color: #1a1a2e;
    box-shadow: 0 8px 24px rgba(251, 191, 36, 0.4);
}

.next-session-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 32px rgba(251, 191, 36, 0.6);
}

.all-sessions-btn {
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.3);
    color: #ffffff;
}

.all-sessions-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-3px);
}

.presentation-footer {
    color: #cbd5e1;
    font-size: 1rem;
}

.presentation-footer p {
    margin-bottom: 0.5rem;
}

/* Responsive Design */
@media (max-width: 1200px) {
    .slide {
        padding: 3rem;
    }
    
    .main-title {
        font-size: 3.5rem;
    }
    
    .subtitle {
        font-size: 2rem;
    }
    
    .slide-title {
        font-size: 3rem;
    }
}

@media (max-width: 768px) {
    .session-header {
        padding: 0 1.5rem;
    }
    
    .title-slide {
        flex-direction: column;
        text-align: center;
    }
    
    .main-title {
        font-size: 2.5rem;
    }
    
    .subtitle {
        font-size: 1.5rem;
    }
    
    .slide-title {
        font-size: 2.2rem;
    }
    
    .nav-controls {
        bottom: 2rem;
    }
    
    .nav-btn {
        width: 50px;
        height: 50px;
    }
}