/* ==========================================================================
   ASUS STORYTELLING LAYOUT SYSTEM — SCROLLYTELLING EXPERIENCE
   ========================================================================== */

:root {
    --st-bg-dark: #07080f;
    --st-bg-card: rgba(18, 22, 36, 0.75);
    --st-bg-glass: rgba(255, 255, 255, 0.04);
    --st-border-glass: rgba(255, 255, 255, 0.12);
    --st-cyan: #00f3ff;
    --st-cyan-glow: rgba(0, 243, 255, 0.35);
    --st-purple: #9d4edd;
    --st-purple-glow: rgba(157, 78, 221, 0.35);
    --st-pink: #ff0055;
    --st-pink-glow: rgba(255, 0, 85, 0.35);
    --st-amber: #ffb703;
    --st-text-main: #f1f5f9;
    --st-text-muted: #94a3b8;
    --st-font-heading: 'Outfit', 'Barlow Condensed', sans-serif;
    --st-font-body: 'Plus Jakarta Sans', sans-serif;
}

/* Base container */
.st-wrapper {
    background-color: var(--st-bg-dark);
    color: var(--st-text-main);
    font-family: var(--st-font-body);
    position: relative;
    overflow-x: hidden;
    padding-bottom: 5rem;
    line-height: 1.6;
}

.st-ambient-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    background: 
        radial-gradient(circle at 20% 30%, rgba(0, 243, 255, 0.08) 0%, transparent 45%),
        radial-gradient(circle at 80% 70%, rgba(157, 78, 221, 0.08) 0%, transparent 45%),
        radial-gradient(circle at 50% 90%, rgba(255, 0, 85, 0.05) 0%, transparent 50%);
}

.st-grid-overlay {
    position: absolute;
    inset: 0;
    background-image: linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
                      linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
    opacity: 0.6;
}

/* ==========================================================================
   FLOATING SIDEBAR CHAPTER INDICATORS & SOUND CONTROLLER
   ========================================================================== */
.st-side-nav {
    position: fixed;
    right: 24px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 99;
    display: flex;
    flex-direction: column;
    gap: 16px;
    align-items: center;
}

.st-nav-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.25);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.st-nav-dot:hover,
.st-nav-dot.active {
    background: var(--st-cyan);
    border-color: rgba(255, 255, 255, 0.9);
    box-shadow: 0 0 15px var(--st-cyan);
    transform: scale(1.4);
}

.st-nav-dot .st-nav-label {
    position: absolute;
    right: 28px;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(15, 23, 42, 0.95);
    border: 1px solid var(--st-border-glass);
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-family: var(--st-font-heading);
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s ease;
    color: var(--st-cyan);
    box-shadow: 0 8px 20px rgba(0,0,0,0.5);
}

.st-nav-dot:hover .st-nav-label {
    opacity: 1;
    visibility: visible;
    right: 24px;
}

/* Audio control toggle - bottom left to avoid header collision */
.st-audio-toggle {
    position: fixed;
    bottom: 24px;
    left: 24px;
    z-index: 100;
    background: rgba(18, 22, 36, 0.9);
    border: 1px solid var(--st-border-glass);
    backdrop-filter: blur(12px);
    border-radius: 30px;
    padding: 8px 18px;
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
}

.st-audio-toggle:hover {
    border-color: var(--st-cyan);
    box-shadow: 0 0 20px var(--st-cyan-glow);
    transform: translateY(-2px);
}

.st-sound-waves {
    display: flex;
    align-items: flex-end;
    gap: 3px;
    height: 16px;
}

.st-sound-bar {
    width: 3px;
    height: 100%;
    background: var(--st-cyan);
    border-radius: 2px;
    animation: st-bar-anim 1.2s ease-in-out infinite alternate;
}

.st-sound-bar:nth-child(2) { animation-delay: 0.2s; }
.st-sound-bar:nth-child(3) { animation-delay: 0.4s; }

.st-audio-toggle.muted .st-sound-bar {
    animation: none;
    height: 4px;
    background: var(--st-text-muted);
}

.st-audio-text {
    font-size: 0.85rem;
    font-weight: 700;
    color: #ffffff;
}

@keyframes st-bar-anim {
    0% { height: 20%; }
    100% { height: 100%; }
}

/* ==========================================================================
   CHAPTER 01: PROLOGUE & HERO HOOK (PURE STORYTELLING - NO BUTTONS)
   ========================================================================== */
.st-chapter-hero {
    min-height: 85vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    position: relative;
    padding: 5rem 1.5rem 6rem 1.5rem;
    z-index: 2;
}

.st-hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 22px;
    background: rgba(0, 243, 255, 0.1);
    border: 1px solid rgba(0, 243, 255, 0.35);
    border-radius: 50px;
    color: var(--st-cyan);
    font-size: 0.85rem;
    font-weight: 800;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    margin-bottom: 2rem;
    box-shadow: 0 0 25px rgba(0, 243, 255, 0.2);
}

.st-hero-title {
    font-family: var(--st-font-heading);
    font-size: clamp(2.5rem, 6.5vw, 5rem);
    font-weight: 900;
    line-height: 1.15;
    margin-bottom: 1.8rem;
    background: linear-gradient(135deg, #ffffff 0%, #a5f3fc 40%, var(--st-cyan) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 0 40px rgba(0, 243, 255, 0.25);
    padding: 0 1rem;
}

.st-hero-subtitle {
    font-size: clamp(1.1rem, 2.2vw, 1.35rem);
    color: var(--st-text-muted);
    max-width: 780px;
    line-height: 1.7;
    margin-bottom: 3.5rem;
    padding: 0 1rem;
}

/* Animated Scroll Guide (Replaces Buttons) */
.st-scroll-guide {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    margin-top: 1rem;
}

.st-scroll-mouse {
    width: 26px;
    height: 44px;
    border: 2px solid var(--st-cyan);
    border-radius: 20px;
    position: relative;
    box-shadow: 0 0 15px var(--st-cyan-glow);
}

.st-scroll-wheel {
    width: 4px;
    height: 8px;
    background: var(--st-cyan);
    border-radius: 2px;
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    animation: st-scroll-anim 2s infinite;
}

@keyframes st-scroll-anim {
    0% { transform: translate(-50%, 0); opacity: 1; }
    80% { transform: translate(-50%, 14px); opacity: 0; }
    100% { transform: translate(-50%, 0); opacity: 0; }
}

.st-scroll-text {
    font-family: var(--st-font-heading);
    font-size: 0.8rem;
    font-weight: 800;
    color: var(--st-cyan);
    letter-spacing: 2px;
    text-transform: uppercase;
}

/* ==========================================================================
   SCROLLYTELLING MAIN CONTAINER & STICKY STAGE
   ========================================================================== */
.st-scrolly-section {
    position: relative;
    padding: 4rem 0;
    z-index: 2;
}

.st-scrolly-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3.5rem;
    align-items: start;
    max-width: 1320px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Sticky Stage (Visual left column) */
.st-sticky-stage {
    position: sticky;
    top: 100px;
    height: 75vh;
    border-radius: 24px;
    background: rgba(15, 20, 32, 0.8);
    border: 1px solid var(--st-border-glass);
    backdrop-filter: blur(16px);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
    transition: all 0.5s ease;
}

.st-stage-content {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2.5rem 2rem;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.6s ease, transform 0.6s ease;
    transform: scale(0.95);
}

.st-stage-content.active {
    opacity: 1;
    visibility: visible;
    transform: scale(1);
}

.st-stage-img {
    max-width: 90%;
    max-height: 55%;
    object-fit: contain;
    filter: drop-shadow(0 15px 30px rgba(0, 243, 255, 0.25));
    transition: transform 0.4s ease;
}

.st-stage-badge {
    position: absolute;
    top: 20px;
    left: 20px;
    padding: 6px 16px;
    background: rgba(0, 0, 0, 0.7);
    border: 1px solid var(--st-cyan);
    border-radius: 20px;
    color: var(--st-cyan);
    font-family: var(--st-font-heading);
    font-size: 0.8rem;
    font-weight: 800;
    letter-spacing: 1px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.st-stage-caption {
    text-align: center;
    margin-top: 1.5rem;
}

.st-stage-title {
    font-family: var(--st-font-heading);
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--st-cyan);
    margin-bottom: 0.3rem;
}

.st-stage-desc {
    font-size: 0.9rem;
    color: var(--st-text-muted);
}

/* Narrative Cards Column (Right side) */
.st-cards-col {
    display: flex;
    flex-direction: column;
    gap: 45vh;
    padding-bottom: 25vh;
}

.st-story-card {
    background: var(--st-bg-card);
    border: 1px solid var(--st-border-glass);
    backdrop-filter: blur(20px);
    border-radius: 24px;
    padding: 2.8rem 2.2rem;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.5);
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    opacity: 0.4;
    transform: translateY(30px);
}

.st-story-card.is-active {
    opacity: 1;
    transform: translateY(0);
    border-color: var(--st-cyan);
    box-shadow: 0 0 35px var(--st-cyan-glow), 0 20px 40px rgba(0, 0, 0, 0.7);
}

.st-card-ch-num {
    font-family: var(--st-font-heading);
    font-size: 0.9rem;
    color: var(--st-cyan);
    letter-spacing: 2px;
    font-weight: 800;
    margin-bottom: 0.8rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.st-card-ch-num::before {
    content: '';
    display: inline-block;
    width: 24px;
    height: 2px;
    background: var(--st-cyan);
}

.st-card-title {
    font-family: var(--st-font-heading);
    font-size: 1.85rem;
    font-weight: 800;
    margin-bottom: 1.2rem;
    color: #ffffff;
    line-height: 1.3;
}

.st-card-desc {
    color: var(--st-text-muted);
    font-size: 1.05rem;
    line-height: 1.75;
    margin-bottom: 1.8rem;
}

.st-card-specs-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.2rem;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.st-spec-item {
    display: flex;
    flex-direction: column;
}

.st-spec-val {
    font-family: var(--st-font-heading);
    font-size: 1.35rem;
    font-weight: 800;
    color: var(--st-cyan);
}

.st-spec-lbl {
    font-size: 0.8rem;
    color: var(--st-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Interactive Hotspots */
.st-hotspots-stage {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.st-hotspot-node {
    position: absolute;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--st-cyan);
    border: 3px solid #fff;
    cursor: pointer;
    box-shadow: 0 0 20px var(--st-cyan);
    transition: transform 0.3s ease;
    z-index: 10;
}

.st-hotspot-node::after {
    content: '';
    position: absolute;
    inset: -8px;
    border-radius: 50%;
    border: 2px solid var(--st-cyan);
    animation: st-pulse-ring 1.8s infinite;
}

@keyframes st-pulse-ring {
    0% { transform: scale(0.6); opacity: 1; }
    100% { transform: scale(1.6); opacity: 0; }
}

.st-hotspot-node:hover {
    transform: scale(1.3);
    background: #fff;
}

.st-hotspot-tooltip {
    position: absolute;
    bottom: 35px;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    background: rgba(15, 23, 42, 0.95);
    border: 1px solid var(--st-cyan);
    backdrop-filter: blur(12px);
    border-radius: 12px;
    padding: 12px 16px;
    width: 210px;
    font-size: 0.85rem;
    color: #fff;
    pointer-events: none;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.6);
    text-align: center;
    z-index: 20;
}

.st-hotspot-node:hover .st-hotspot-tooltip {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.st-hp-cpu { top: 38%; left: 42%; }
.st-hp-gpu { top: 48%; left: 58%; }
.st-hp-display { top: 22%; left: 50%; }
.st-hp-fan { top: 65%; left: 35%; }

/* ==========================================================================
   CHAPTER 04: PERSONA DAY IN THE LIFE (CONTINUOUS STORYLINE MATRIX - NO BUTTON TABS)
   ========================================================================== */
.st-persona-section {
    max-width: 1320px;
    margin: 7rem auto;
    padding: 0 1.5rem;
}

.st-section-header {
    text-align: center;
    margin-bottom: 3.5rem;
}

.st-section-title {
    font-family: var(--st-font-heading);
    font-size: clamp(2.2rem, 4.5vw, 3.2rem);
    font-weight: 800;
    margin-bottom: 1rem;
    color: #ffffff;
}

.st-section-subtitle {
    color: var(--st-text-muted);
    font-size: 1.1rem;
    max-width: 680px;
    margin: 0 auto;
    line-height: 1.6;
}

/* 3-Column Storyline Matrix (Continuous Stream) */
.st-storyline-matrix {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.st-storyline-col {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.st-stream-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 20px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--st-border-glass);
    border-radius: 16px;
    font-family: var(--st-font-heading);
    font-size: 1.2rem;
    font-weight: 800;
    color: #ffffff;
}

.st-timeline-card {
    background: var(--st-bg-card);
    border: 1px solid var(--st-border-glass);
    border-radius: 20px;
    padding: 1.8rem;
    backdrop-filter: blur(16px);
    transition: all 0.35s ease;
    height: 100%;
}

.st-timeline-card:hover {
    transform: translateY(-6px);
    border-color: var(--st-purple);
    box-shadow: 0 15px 30px var(--st-purple-glow);
}

.st-tl-time {
    font-family: var(--st-font-heading);
    font-size: 1.15rem;
    font-weight: 800;
    color: var(--st-amber);
    margin-bottom: 0.5rem;
}

.st-tl-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 0.8rem;
    line-height: 1.35;
}

.st-tl-desc {
    color: var(--st-text-muted);
    font-size: 0.95rem;
    line-height: 1.65;
}

/* ==========================================================================
   CHAPTER 05: FINALE MODEL SHOWCASE (NO BUY BUTTONS - PURE NARRATIVE CARDS)
   ========================================================================== */
.st-finale-section {
    max-width: 1320px;
    margin: 7rem auto 3rem auto;
    padding: 0 1.5rem;
}

.st-compare-matrix {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.st-matrix-card {
    background: linear-gradient(180deg, rgba(20, 26, 44, 0.85) 0%, rgba(10, 13, 22, 0.95) 100%);
    border: 1px solid var(--st-border-glass);
    border-radius: 24px;
    padding: 2.5rem 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    position: relative;
    overflow: hidden;
    transition: all 0.4s ease;
    text-decoration: none;
    color: var(--st-text-main);
}

.st-matrix-card:hover {
    transform: translateY(-8px);
    border-color: var(--st-cyan);
    box-shadow: 0 0 35px var(--st-cyan-glow);
}

.st-matrix-tag {
    font-family: var(--st-font-heading);
    font-size: 0.75rem;
    font-weight: 800;
    letter-spacing: 1px;
    padding: 4px 14px;
    border-radius: 20px;
    background: rgba(0, 243, 255, 0.15);
    color: var(--st-cyan);
    border: 1px solid rgba(0, 243, 255, 0.35);
    margin-bottom: 1.2rem;
}

.st-matrix-img {
    width: 100%;
    height: 180px;
    object-fit: contain;
    margin-bottom: 1.5rem;
    filter: drop-shadow(0 10px 20px rgba(0, 0, 0, 0.5));
    transition: transform 0.4s ease;
}

.st-matrix-card:hover .st-matrix-img {
    transform: scale(1.06);
}

.st-matrix-name {
    font-family: var(--st-font-heading);
    font-size: 1.5rem;
    font-weight: 800;
    color: #ffffff;
    margin-bottom: 0.6rem;
    line-height: 1.3;
}

.st-matrix-price {
    font-family: var(--st-font-heading);
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--st-cyan);
    margin-bottom: 1.5rem;
}

.st-matrix-features {
    width: 100%;
    list-style: none;
    padding: 0;
    margin: 0 0 2rem 0;
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    font-size: 0.95rem;
    color: var(--st-text-muted);
}

.st-matrix-features li {
    padding-bottom: 0.6rem;
    border-bottom: 1px dashed rgba(255, 255, 255, 0.08);
}

.st-model-link-text {
    font-family: var(--st-font-heading);
    font-size: 0.95rem;
    font-weight: 800;
    color: var(--st-cyan);
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: auto;
    transition: transform 0.25s ease;
}

.st-matrix-card:hover .st-model-link-text {
    transform: translateX(5px);
    color: #ffffff;
}

/* Responsive adjustments */
@media (max-width: 1024px) {
    .st-storyline-matrix,
    .st-compare-matrix {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 992px) {
    .st-scrolly-grid {
        grid-template-columns: 1fr;
    }
    .st-sticky-stage {
        position: relative;
        top: 0;
        height: 50vh;
        margin-bottom: 2rem;
    }
    .st-cards-col {
        gap: 4rem;
        padding-bottom: 4rem;
    }
    .st-side-nav {
        display: none;
    }
}