/* ============================================
   simulai.tech - Styles
   Palette: Duotone (#FF2D78 / #7B2FFF)
   Fonts: Outfit, Plus Jakarta Sans, Instrument Sans, Fira Code
   ============================================ */

:root {
    --color-a: #FF2D78;
    --color-b: #7B2FFF;
    --bg-dark: #0A0014;
    --bg-deep: #12082B;
    --text-primary: #FFFFFF;
    --text-secondary: #C8C0D8;
    --accent-cyan: #00E5FF;
    --accent-warm: #FF6B9D;
    --sidebar-width-collapsed: 72px;
    --sidebar-width-expanded: 240px;
    --sidebar-bg: rgba(10, 0, 20, 0.85);
}

/* Reset */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Plus Jakarta Sans', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-secondary);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   Sidebar Navigation
   ============================================ */

#sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width-collapsed);
    height: 100vh;
    background: var(--sidebar-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: width 300ms cubic-bezier(0.34, 1.56, 0.64, 1);
    overflow: hidden;
}

#sidebar:hover {
    width: var(--sidebar-width-expanded);
}

.sidebar-pulse-line {
    position: absolute;
    left: 36px;
    top: 50%;
    transform: translateY(-50%);
    width: 1px;
    height: 240px;
    background: linear-gradient(180deg, var(--color-a), var(--accent-cyan), var(--color-b), var(--color-a));
    background-size: 100% 300%;
    animation: pulseFlow 4s linear infinite;
    opacity: 0.6;
    z-index: -1;
}

@keyframes pulseFlow {
    0% { background-position: 0% 0%; }
    100% { background-position: 0% 300%; }
}

.sidebar-item {
    display: flex;
    align-items: center;
    gap: 16px;
    width: 100%;
    padding: 12px 24px;
    text-decoration: none;
    color: var(--text-secondary);
    transition: color 200ms ease;
    white-space: nowrap;
}

.sidebar-item:hover,
.sidebar-item.active {
    color: var(--accent-cyan);
}

.sidebar-item.active .sidebar-icon,
.sidebar-item:hover .sidebar-icon {
    filter: drop-shadow(0 0 6px rgba(0, 229, 255, 0.5));
}

.sidebar-icon {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
    color: inherit;
    transition: filter 200ms ease;
}

.sidebar-label {
    font-family: 'Fira Code', monospace;
    font-size: 0.75rem;
    font-weight: 400;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--accent-cyan);
    opacity: 0;
    transition: opacity 200ms ease 100ms;
}

#sidebar:hover .sidebar-label {
    opacity: 1;
}

/* ============================================
   Mobile Bottom Nav
   ============================================ */

#mobile-nav {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 56px;
    background: var(--sidebar-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 1000;
    justify-content: space-around;
    align-items: center;
}

.mobile-nav-item {
    width: 24px;
    height: 24px;
    color: var(--text-secondary);
    transition: color 200ms ease;
}

.mobile-nav-item.active {
    color: var(--accent-cyan);
    filter: drop-shadow(0 0 6px rgba(0, 229, 255, 0.5));
}

.mobile-nav-item svg {
    width: 100%;
    height: 100%;
}

/* ============================================
   Main Content
   ============================================ */

#main-content {
    margin-left: var(--sidebar-width-collapsed);
}

/* ============================================
   Sections - Common
   ============================================ */

.section {
    position: relative;
    min-height: 100vh;
    overflow: hidden;
    opacity: 0;
    transform: translateY(40px) perspective(1200px) rotateY(2deg);
    transition: opacity 700ms cubic-bezier(0.22, 1, 0.36, 1),
                transform 700ms cubic-bezier(0.22, 1, 0.36, 1);
}

.section.visible {
    opacity: 1;
    transform: translateY(0) perspective(1200px) rotateY(0deg);
}

.section-heading {
    font-family: 'Outfit', sans-serif;
    font-weight: 700;
    font-size: clamp(2.4rem, 7vw, 6rem);
    letter-spacing: -0.03em;
    color: var(--text-primary);
    line-height: 1.1;
    margin-bottom: 1.5rem;
}

.body-text {
    font-family: 'Plus Jakarta Sans', sans-serif;
    font-weight: 400;
    font-size: clamp(1rem, 1.4vw, 1.25rem);
    line-height: 1.65;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

/* ============================================
   Aurora Effects
   ============================================ */

.aurora-layer {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
}

.aurora {
    position: absolute;
    border-radius: 50%;
    opacity: 0;
    transition: opacity 2s ease;
}

.section.visible .aurora {
    opacity: 1;
}

.aurora-1 {
    width: 60vw;
    height: 60vw;
    top: -10%;
    left: 20%;
    background: radial-gradient(ellipse at center, rgba(255, 45, 120, 0.12) 0%, transparent 70%);
    animation: auroraDrift1 15s ease-in-out infinite;
}

.aurora-2 {
    width: 50vw;
    height: 50vw;
    top: 30%;
    right: -10%;
    background: radial-gradient(ellipse at center, rgba(123, 47, 255, 0.10) 0%, transparent 70%);
    animation: auroraDrift2 18s ease-in-out infinite;
}

.aurora-3 {
    width: 40vw;
    height: 40vw;
    bottom: -5%;
    left: 10%;
    background: radial-gradient(ellipse at center, rgba(0, 229, 255, 0.07) 0%, transparent 70%);
    animation: auroraDrift3 20s ease-in-out infinite;
}

@keyframes auroraDrift1 {
    0%, 100% { transform: translate(0, 0); }
    33% { transform: translate(5vw, 3vh); }
    66% { transform: translate(-3vw, -2vh); }
}

@keyframes auroraDrift2 {
    0%, 100% { transform: translate(0, 0); }
    33% { transform: translate(-4vw, 5vh); }
    66% { transform: translate(6vw, -3vh); }
}

@keyframes auroraDrift3 {
    0%, 100% { transform: translate(0, 0); }
    33% { transform: translate(3vw, -4vh); }
    66% { transform: translate(-5vw, 2vh); }
}

/* ============================================
   Hero Section
   ============================================ */

#hero {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-dark);
    height: 100vh;
}

.particle-field {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    opacity: 0;
    transition: opacity 1.5s ease;
}

.section.visible .particle-field {
    opacity: 1;
}

.hero-content {
    position: relative;
    z-index: 10;
    text-align: center;
}

.hero-title {
    font-family: 'Outfit', sans-serif;
    font-weight: 900;
    font-size: clamp(3rem, 10vw, 8rem);
    color: var(--text-primary);
    letter-spacing: -0.03em;
    margin-bottom: 1rem;
}

.hero-title .letter {
    display: inline-block;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 400ms ease, transform 400ms ease;
}

.hero-title.animate .letter {
    opacity: 1;
    transform: translateY(0);
}

.hero-tagline {
    font-family: 'Instrument Sans', sans-serif;
    font-weight: 400;
    font-size: clamp(1rem, 2vw, 1.5rem);
    color: var(--text-secondary);
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 600ms ease, transform 600ms ease;
}

.hero-tagline.animate {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================
   Concept Section
   ============================================ */

#concept {
    background-color: var(--bg-deep);
    padding: 8vh 6vw;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.concept-layout {
    display: flex;
    gap: 4%;
    align-items: flex-start;
}

.concept-label-col {
    flex: 0 0 38%;
    position: sticky;
    top: 30vh;
}

.concept-content-col {
    flex: 0 0 58%;
}

.fluid-accent {
    font-family: 'Instrument Sans', sans-serif;
    font-weight: 400;
    font-size: 1.2rem;
    color: var(--accent-warm);
    line-height: 1.2;
    will-change: font-variation-settings, font-size;
    contain: layout style;
    font-variation-settings: 'wght' var(--fluid-weight, 400);
}

.concept-diagram {
    width: 100%;
    max-width: 600px;
    height: auto;
    margin-top: 2rem;
}

/* SVG Node / Connection styles */
.node {
    fill: transparent;
    stroke-width: 1.5;
    opacity: 0;
    transform-origin: center;
    transform: scale(0);
    transition: opacity 400ms ease, transform 400ms ease;
}

.node-a {
    stroke: var(--color-a);
}

.node-b {
    stroke: var(--accent-cyan);
}

.conn {
    fill: none;
    stroke: var(--color-b);
    stroke-width: 1.5;
    opacity: 0.4;
    stroke-dasharray: 200;
    stroke-dashoffset: 200;
    transition: stroke-dashoffset 1.5s ease-in-out;
}

.draw-on-scroll.animate .node {
    opacity: 1;
    transform: scale(1);
}

.draw-on-scroll.animate .conn {
    stroke-dashoffset: 0;
}

.node.pulse {
    animation: nodePulse 2s ease-in-out infinite;
}

@keyframes nodePulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.15); }
}

/* ============================================
   Section Dividers
   ============================================ */

.section-divider {
    display: flex;
    justify-content: center;
    padding: 4vh 0;
}

.divider-svg {
    width: clamp(200px, 40vw, 400px);
    height: 20px;
}

.divider-line {
    stroke: var(--color-b);
    stroke-width: 1;
    opacity: 0.4;
    stroke-dasharray: 200;
    stroke-dashoffset: 200;
    transition: stroke-dashoffset 1.2s ease-in-out;
}

.divider-shape {
    fill: none;
    stroke: var(--color-a);
    stroke-width: 1.5;
    opacity: 0;
    transform-origin: center;
    transform: scale(0);
    transition: opacity 400ms ease, transform 400ms ease;
}

.section.visible .divider-line {
    stroke-dashoffset: 0;
}

.section.visible .divider-shape {
    opacity: 0.8;
    transform: scale(1);
}

/* ============================================
   Showcase Section
   ============================================ */

.section-showcase {
    background-color: var(--bg-dark);
    padding: 10vh 6vw;
}

.showcase-heading {
    text-align: center;
    margin-bottom: 8vh;
    font-size: clamp(2rem, 5vw, 4rem);
}

.showcase-item {
    width: 80vw;
    max-width: 900px;
    margin: 0 auto 20vh auto;
    opacity: 0;
    transform: scale(0.92);
    transition: opacity 700ms cubic-bezier(0.22, 1, 0.36, 1),
                transform 700ms cubic-bezier(0.22, 1, 0.36, 1);
}

.showcase-item.visible {
    opacity: 1;
    transform: scale(1);
}

.showcase-vector {
    width: 100%;
    height: auto;
    margin-bottom: 2rem;
}

.showcase-title {
    font-family: 'Outfit', sans-serif;
    font-weight: 700;
    font-size: clamp(1.6rem, 3vw, 2.4rem);
    letter-spacing: -0.03em;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.orbit-ring {
    fill: none;
    stroke: var(--color-b);
    stroke-width: 1;
    opacity: 0.3;
    stroke-dasharray: 600;
    stroke-dashoffset: 600;
    transition: stroke-dashoffset 2s ease-in-out;
}

.draw-on-scroll.animate .orbit-ring {
    stroke-dashoffset: 0;
}

.tendril-path {
    fill: none;
    stroke: var(--color-a);
    stroke-width: 3;
    opacity: 0.3;
    stroke-dasharray: 1000;
    stroke-dashoffset: 1000;
    transition: stroke-dashoffset 2s ease-in-out;
}

.draw-on-scroll.animate .tendril-path {
    stroke-dashoffset: 0;
}

.data-line {
    fill: none;
    stroke: var(--color-a);
    stroke-width: 2;
    stroke-dasharray: 800;
    stroke-dashoffset: 800;
    transition: stroke-dashoffset 1.5s ease-in-out;
}

.data-line-shadow {
    fill: none;
    stroke: var(--color-b);
    stroke-width: 1.5;
    opacity: 0.3;
    stroke-dasharray: 800;
    stroke-dashoffset: 800;
    transition: stroke-dashoffset 1.5s ease-in-out 200ms;
}

.draw-on-scroll.animate .data-line,
.draw-on-scroll.animate .data-line-shadow {
    stroke-dashoffset: 0;
}

/* ============================================
   Vision Section
   ============================================ */

.section-vision {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-deep);
}

.vision-pattern-bg {
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at 20% 50%, rgba(123, 47, 255, 0.05) 1px, transparent 1px),
        radial-gradient(circle at 80% 30%, rgba(255, 45, 120, 0.05) 1px, transparent 1px);
    background-size: 40px 40px, 60px 60px;
}

.vision-gradient-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255, 45, 120, 0.25) 0%, rgba(123, 47, 255, 0.25) 100%);
    mix-blend-mode: color;
}

.vision-tendrils {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.aurora-tendril {
    fill: none;
    stroke-width: 120;
    opacity: 0.1;
    stroke-linecap: round;
}

.tendril-a {
    stroke: var(--color-a);
    animation: tendrilDrift 15s ease-in-out infinite;
}

.tendril-b {
    stroke: var(--color-b);
    animation: tendrilDrift 15s ease-in-out infinite reverse;
}

@keyframes tendrilDrift {
    0%, 100% { transform: translateX(0); }
    50% { transform: translateX(5vw); }
}

.vision-content {
    position: relative;
    z-index: 10;
    text-align: center;
    max-width: 800px;
    padding: 0 4vw;
}

.vision-accent {
    font-size: clamp(1.4rem, 3vw, 2.4rem);
    margin-bottom: 2rem;
    color: var(--accent-cyan);
}

.vision-heading {
    font-family: 'Outfit', sans-serif;
    font-weight: 700;
    font-size: clamp(1.6rem, 4vw, 3rem);
    letter-spacing: -0.03em;
    color: var(--text-primary);
    line-height: 1.3;
}

/* ============================================
   Contact Section
   ============================================ */

.section-contact {
    height: 60vh;
    min-height: 60vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-dark);
}

.contact-content {
    position: relative;
    z-index: 10;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

.contact-rule {
    width: clamp(200px, 40vw, 400px);
    height: 4px;
}

.gradient-stroke {
    stroke: url(#contactGradient);
    stroke-width: 2;
    stroke-dasharray: 400;
    stroke-dashoffset: 400;
    transition: stroke-dashoffset 1.5s ease-in-out;
}

.section-contact.visible .gradient-stroke {
    stroke-dashoffset: 0;
}

.contact-email {
    font-family: 'Outfit', sans-serif;
    font-weight: 700;
    font-size: clamp(1.6rem, 4vw, 3rem);
    letter-spacing: -0.03em;
    color: var(--text-primary);
    text-decoration: none;
    transition: color 300ms ease;
}

.contact-email:hover {
    color: var(--accent-cyan);
}

.contact-line {
    overflow: hidden;
}

/* Contact gradient - defined inline via JS since SVG gradients need defs */

/* ============================================
   Particle Styles (generated via JS)
   ============================================ */

.particle {
    fill: var(--color-a);
    opacity: 0.3;
}

.particle-cyan {
    fill: var(--accent-cyan);
    opacity: 0.2;
}

/* ============================================
   Stagger Animation Delays for Children
   ============================================ */

.section.visible .stagger-child {
    opacity: 1;
    transform: translateY(0);
}

.stagger-child {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 500ms ease, transform 500ms ease;
}

/* ============================================
   Responsive - Below 768px
   ============================================ */

@media (max-width: 768px) {
    #sidebar {
        display: none;
    }

    #mobile-nav {
        display: flex;
    }

    #main-content {
        margin-left: 0;
        padding-bottom: 56px;
    }

    .section {
        transform: translateY(40px);
    }

    .section.visible {
        transform: translateY(0);
    }

    .concept-layout {
        flex-direction: column;
        gap: 2rem;
    }

    .concept-label-col {
        flex: none;
        position: static;
    }

    .concept-content-col {
        flex: none;
    }

    .showcase-item {
        width: 90vw;
    }

    .aurora-tendril {
        stroke-width: 60;
    }

    .sidebar-pulse-line {
        display: none;
    }
}

/* ============================================
   Scrollbar Styling
   ============================================ */

::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: var(--bg-dark);
}

::-webkit-scrollbar-thumb {
    background: var(--color-b);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-a);
}

/* ============================================
   Selection Styling
   ============================================ */

::selection {
    background: rgba(123, 47, 255, 0.4);
    color: var(--text-primary);
}