/* 1. SETUP - Báo chí Style (Sạch, Trắng, Chữ có chân) */
* { box-sizing: border-box; }

body {
  background-color: #f0f2f5; /* Light gray background */
  display: grid;
  gap: 20px;
  grid-template-columns: 1fr;
  margin: 0;
  min-height: 100vh;
  padding: 20px 0;
  place-items: center;
  font-family: 'Inter', sans-serif; /* Body font */
  color: #1a1a1a;
}

.slide-container {
  align-items: flex-start;
  background-color: #ffffff;
  border-radius: 8px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  display: flex;
  flex-direction: column;
  gap: 25px;
  height: 100vh;
  justify-content: center;
  overflow: hidden;
  padding: 50px 70px;
  position: relative;
  width: 100%;

}

/* Background Design - Elegant Journalism Feel */
.slide-container::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 8px;
  background: linear-gradient(90deg, #c0392b, #e74c3c); /* Red header bar */
  z-index: 10;
}

.watermark {
    position: absolute;
    bottom: -20px;
    right: -20px;
    font-size: 200px;
    color: #dc2626;
    font-family: 'Merriweather', serif;
    font-weight: 700;
    z-index: 0;
    pointer-events: none;
}

.slide-container > * { position: relative; z-index: 1; }

/* 2. TYPOGRAPHY */
h1, h2, h3 {
  color: #2c3e50;
  margin: 0;
  font-family: 'Merriweather', serif; /* Heading font */
}

h1 { font-size: 64px; line-height: 1.2; font-weight: 900; color: #2c3e50; }
.slide-title { font-size: 48px; margin-bottom: 30px; color: #c0392b; border-bottom: 2px solid #f2f2f2; padding-bottom: 15px; width: 100%; }
h3 { font-size: 26px; color: #2980b9; margin-bottom: 10px; font-weight: 700; }
p, li { color: #555; font-size: 20px; line-height: 1.6; font-family: 'Inter', sans-serif; }
.subtitle { font-size: 26px; color: #7f8c8d; margin-top: 20px; font-weight: 300; font-style: italic; font-family: 'Merriweather', serif;}

/* 3. LAYOUT UTILITIES */
.content-area { display: flex; flex-direction: column; flex-grow: 1; width: 100%; justify-content: center; }

.two-column { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; width: 100%; align-items: start; }
.three-column { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 40px; width: 100%; }

/* Cards for Roles */
.role-card {
    background: #f9fbfd;
    border: 1px solid #e1e8ed;
    border-radius: 12px;
    padding: 30px;
    text-align: center;
    transition: transform 0.2s;
}
.role-card:hover { transform: translateY(-5px); box-shadow: 0 10px 20px rgba(0,0,0,0.05); }
.role-icon { width: 80px; height: 80px; background: #e8f4f8; border-radius: 50%; display: flex; align-items: center; justify-content: center; margin: 0 auto 20px; color: #2980b9; font-size: 32px; }

/* Feature List */
.feature-list { list-style: none; padding: 0; }
.feature-list li { margin-bottom: 15px; display: flex; align-items: flex-start; }
.feature-list li i { color: #27ae60; margin-right: 15px; margin-top: 5px; font-size: 20px; min-width: 25px; }

/* Quote Box */
.quote-box {
    background: #fff8e1;
    border-left: 5px solid #f1c40f;
    padding: 30px;
    font-size: 22px;
    font-style: italic;
    color: #5d4037;
    border-radius: 0 8px 8px 0;
    font-family: 'Merriweather', serif;
}

/* Comparison Table (Simple) */
.comparison-row { display: flex; margin-bottom: 20px; align-items: stretch; }
.comp-col-left { flex: 1; padding: 25px; background: #fdf2f2; border-radius: 12px 0 0 12px; border: 1px solid #fadbd8; }
.comp-col-right { flex: 1; padding: 25px; background: #eafaf1; border-radius: 0 12px 12px 0; border: 1px solid #d5f5e3; }
.comp-title { font-weight: bold; margin-bottom: 10px; display: block; font-size: 20px; font-family: 'Merriweather', serif;}

/* Image Layouts */
.img-right-layout { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 50px; align-items: center; }
.img-placeholder { width: 100%; height: 350px; background: #eee; border-radius: 12px; overflow: hidden; display: flex; align-items: center; justify-content: center; }
.img-placeholder img { width: 100%; height: 100%; object-fit: cover; }

/* Highlight Box */
.highlight-box {
    background: linear-gradient(135deg, #2c3e50 0%, #3498db 100%);
    color: white;
    padding: 40px;
    border-radius: 16px;
    text-align: center;
}
.highlight-box h3, .highlight-box p { color: white; }

/* ==================== CAROUSEL SLIDER ==================== */
.slider-wrapper {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    background-color: #f0f2f5;
}

.slider-container {
    display: flex;
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    height: 100%;
}

.slider-container .slide-container {
    min-width: 100vw;
    height: 100vh;
    flex-shrink: 0;
    border-radius: 0;
    box-shadow: none;
}

/* Navigation Arrows */
.slider-nav {
    position: fixed;
    top: 50%;
    transform: translateY(-50%);
    z-index: 100;
    background: rgba(255, 255, 255, 0.95);
    border: none;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    transition: all 0.3s ease;
    color: #2c3e50;
    font-size: 24px;
}

.slider-nav:hover {
    background: #c0392b;
    color: white;
    transform: translateY(-50%) scale(1.1);
}

.slider-nav:active {
    transform: translateY(-50%) scale(0.95);
}

.slider-nav.prev {
    left: 30px;
}

.slider-nav.next {
    right: 30px;
}

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

.slider-nav:disabled:hover {
    background: rgba(255, 255, 255, 0.95);
    color: #2c3e50;
    transform: translateY(-50%);
}

/* Navigation Dots */
.slider-dots {
    position: fixed;
    right: 30px;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    gap: 12px;
    z-index: 100;
}

.slider-dot {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.2);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
}

.slider-dot:hover {
    background: rgba(192, 57, 43, 0.5);
}

.slider-dot.active {
    background: #c0392b;
    transform: scale(1.3);
    border-color: rgba(255, 255, 255, 0.8);
    box-shadow: 0 2px 8px rgba(192, 57, 43, 0.4);
}

/* Tooltip for dots */
.slider-dot::before {
    content: attr(data-title);
    position: absolute;
    right: 25px;
    top: 50%;
    transform: translateY(-50%);
    background: #2c3e50;
    color: white;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 13px;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    font-family: 'Inter', sans-serif;
}

.slider-dot:hover::before {
    opacity: 1;
    visibility: visible;
    right: 30px;
}

/* Progress Bar */
.slider-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 4px;
    background: #c0392b;
    z-index: 101;
    transition: width 0.3s ease;
}

/* Slide Counter */
.slide-counter {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(44, 62, 80, 0.9);
    color: white;
    padding: 10px 24px;
    border-radius: 30px;
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    font-weight: 500;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.slide-counter span {
    color: #e74c3c;
    font-weight: 700;
}

/* Mobile Responsive */
@media (max-width: 1024px) {
    .slider-container .slide-container {
        padding: 40px 50px;
    }

    .slider-nav {
        width: 48px;
        height: 48px;
        font-size: 20px;
    }

    .slider-nav.prev {
        left: 15px;
    }

    .slider-nav.next {
        right: 15px;
    }

    .slider-dots {
        right: 15px;
        gap: 10px;
    }

    .slider-dot {
        width: 12px;
        height: 12px;
    }

    .slider-dot::before {
        display: none;
    }

    h1 {
        font-size: 42px;
    }

    .slide-title {
        font-size: 36px;
    }

    .img-right-layout {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .three-column, .two-column {
        grid-template-columns: 1fr;
        gap: 25px;
    }
}

@media (max-width: 768px) {
    .slider-container .slide-container {
        padding: 30px 25px;
        padding-top: 50px;
    }

    .slider-nav {
        width: 44px;
        height: 44px;
        font-size: 18px;
    }

    .slider-nav.prev {
        left: 10px;
    }

    .slider-nav.next {
        right: 10px;
    }

    .slider-dots {
        flex-direction: row;
        top: auto;
        bottom: 80px;
        right: 50%;
        transform: translateX(50%);
    }

    h1 {
        font-size: 32px;
    }

    .slide-title {
        font-size: 28px;
        margin-bottom: 20px;
    }

    h3 {
        font-size: 20px;
    }

    p, li {
        font-size: 16px;
    }

    .subtitle {
        font-size: 18px;
    }

    .slide-counter {
        bottom: 20px;
        padding: 8px 18px;
        font-size: 12px;
    }

    .role-card {
        padding: 20px;
    }

    .role-icon {
        width: 60px;
        height: 60px;
        font-size: 24px;
    }

    .feature-list li i {
        font-size: 16px;
        min-width: 20px;
    }

    .comparison-row {
        flex-direction: column;
    }

    .comp-col-left, .comp-col-right {
        border-radius: 12px;
    }

    .quote-box {
        padding: 20px;
        font-size: 18px;
    }

    .highlight-box {
        padding: 25px;
    }

    .highlight-box p {
        font-size: 18px !important;
    }
}

/* Touch feedback */
.slider-container.dragging {
    transition: none;
}

/* Keyboard focus styles */
.slider-nav:focus,
.slider-dot:focus {
    outline: 3px solid #3498db;
    outline-offset: 3px;
}

/* Animation for slide content */
.slide-container.active .slide-title,
.slide-container.active .content-container,
.slide-container.active .content-area,
.slide-container.active .image-container {
    animation: fadeInUp 0.6s ease forwards;
}

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