/* =========================================
   simulai.net - Flat Design Editorial Monograph
   ========================================= */

/* CSS Custom Properties */
:root {
    --cerulean-silk: #4A90D9;
    --midnight-ink: #1B2A4A;
    --glacial-white: #F7F9FC;
    --frost-blue: #B8D4F0;
    --deep-slate: #1A2332;
    --ice-white: #EDF2F8;
    --glass-tint: rgba(184, 212, 240, 0.15);
    --glass-tint-dark: rgba(255, 255, 255, 0.08);
    --glass-border: rgba(255, 255, 255, 0.25);

    --font-display: 'Playfair Display', Georgia, serif;
    --font-body: 'DM Sans', 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'IBM Plex Mono', 'Courier New', monospace;
}

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

html {
    scroll-behavior: smooth;
    scroll-snap-type: y proximity;
}

body {
    font-family: var(--font-body);
    font-weight: 400;
    color: var(--deep-slate);
    background-color: var(--glacial-white);
    line-height: 1.72;
    letter-spacing: 0.01em;
    font-size: clamp(1rem, 1.1vw, 1.2rem);
    overflow-x: hidden;
}

/* Persistent Header */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 100;
    padding: 2.4vh 5vw;
}

.wordmark {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--ice-white);
    letter-spacing: -0.02em;
    transition: color 0.4s ease;
}

.wordmark--dark {
    color: var(--deep-slate);
}

.header-rule {
    position: fixed;
    top: 8vh;
    left: 5vw;
    right: 5vw;
    height: 1px;
    background-color: var(--frost-blue);
    opacity: 0.4;
    z-index: 100;
}

/* Sections */
.section {
    min-height: 100vh;
    position: relative;
    scroll-snap-align: start;
    padding: 5vw;
}

.section--cerulean {
    background-color: var(--cerulean-silk);
    color: var(--ice-white);
}

.section--white {
    background-color: var(--glacial-white);
    color: var(--deep-slate);
}

.section--navy {
    background-color: var(--midnight-ink);
    color: var(--ice-white);
}

/* =========================================
   Section 1: Opening Spread
   ========================================= */
.opening-content {
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    align-items: flex-start;
    min-height: 100vh;
    padding-bottom: 12vh;
    padding-top: 12vh;
    position: relative;
}

.hero-title {
    font-family: var(--font-display);
    font-weight: 400;
    font-style: italic;
    font-size: clamp(2.8rem, 6vw, 5.5rem);
    letter-spacing: -0.02em;
    line-height: 1.1;
    color: var(--ice-white);
    margin-top: auto;
    padding-top: 61.8%;
}

.hero-title .char {
    display: inline-block;
    opacity: 0;
    transform: translateY(8px);
}

.glass-card--opening {
    position: absolute;
    top: 16vh;
    right: 5vw;
    max-width: 340px;
}

/* =========================================
   Glassmorphic Cards
   ========================================= */
.glass-card {
    background: var(--glass-tint);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    backdrop-filter: blur(20px) saturate(1.2);
    -webkit-backdrop-filter: blur(20px) saturate(1.2);
    padding: 2rem 2.2rem;
}

.glass-card--dark {
    background: var(--glass-tint-dark);
    border: 1px solid var(--glass-border);
}

.glass-card__label {
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--frost-blue);
    display: block;
    margin-bottom: 1rem;
}

.glass-card__label--inverse {
    color: var(--frost-blue);
}

.glass-card__text {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(0.9rem, 1vw, 1.05rem);
    line-height: 1.72;
    color: var(--ice-white);
}

/* =========================================
   Section 2: Concept Section
   ========================================= */
#concept {
    min-height: 120vh;
    display: flex;
    align-items: center;
}

.concept-grid {
    display: grid;
    grid-template-columns: 5fr 3fr;
    gap: 32px;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
    padding-top: 10vh;
}

.section-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(2.8rem, 6vw, 5.5rem);
    letter-spacing: -0.02em;
    line-height: 1.1;
    margin-bottom: 2rem;
    opacity: 0;
    transition: opacity 0.5s ease;
}

.section-title--inverse {
    color: var(--ice-white);
}

.section-title.is-visible {
    opacity: 1;
}

.concept-body p {
    margin-bottom: 1.2rem;
    color: var(--deep-slate);
}

.concept-body em {
    font-style: italic;
    font-family: var(--font-display);
    font-weight: 400;
}

.text-rule {
    border: none;
    height: 1px;
    background-color: var(--frost-blue);
    margin: 1.8rem 0;
}

.glass-card--concept {
    position: sticky;
    top: 20vh;
    height: 450px;
    display: flex;
    flex-direction: column;
}

.data-viz {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.viz-svg {
    width: 100%;
    height: 100%;
}

/* =========================================
   Section 3: Capability Section
   ========================================= */
#capabilities {
    min-height: 180vh;
    padding-top: 15vh;
    padding-bottom: 15vh;
}

.capabilities-container {
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.capability-card {
    margin-bottom: 60vh;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94),
                transform 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.capability-card:last-child {
    margin-bottom: 0;
}

.capability-card.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.capability-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(1.6rem, 3vw, 2.4rem);
    letter-spacing: -0.02em;
    color: var(--ice-white);
    margin-bottom: 1rem;
    line-height: 1.2;
}

.capability-desc {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: clamp(0.9rem, 1vw, 1.05rem);
    line-height: 1.72;
    color: var(--ice-white);
    opacity: 0.85;
}

/* =========================================
   Section 4: Process Section
   ========================================= */
#process {
    min-height: 100vh;
    padding-top: 12vh;
    padding-bottom: 12vh;
}

.process-container {
    max-width: 520px;
    margin: 0 auto;
    position: relative;
}

.process-timeline {
    position: absolute;
    left: 11px;
    top: 140px;
    bottom: 40px;
    width: 1px;
    background-color: rgba(74, 144, 217, 0.3);
}

.process-step {
    display: flex;
    gap: 2rem;
    padding-bottom: 120px;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.process-step:last-child {
    padding-bottom: 0;
}

.process-step.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.step-marker {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.pulse-point {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: var(--cerulean-silk);
    position: relative;
}

.pulse-point::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: var(--cerulean-silk);
    transform: translate(-50%, -50%);
    opacity: 0;
}

.pulse-point.is-pulsing::after {
    animation: pulseExpand 1.2s ease-out forwards;
}

@keyframes pulseExpand {
    0% {
        width: 4px;
        height: 4px;
        opacity: 0.8;
    }
    100% {
        width: 24px;
        height: 24px;
        opacity: 0;
    }
}

.step-content {
    flex: 1;
}

.step-number {
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--cerulean-silk);
    display: block;
    margin-bottom: 0.5rem;
}

.step-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(1.6rem, 3vw, 2.2rem);
    letter-spacing: -0.02em;
    color: var(--deep-slate);
    margin-bottom: 0.8rem;
    line-height: 1.2;
}

.step-desc {
    font-family: var(--font-body);
    font-weight: 400;
    color: var(--deep-slate);
    opacity: 0.8;
}

/* =========================================
   Section 5: Closing Spread
   ========================================= */
#closing {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}

.closing-content {
    text-align: center;
    max-width: 540px;
}

.closing-title {
    font-family: var(--font-display);
    font-weight: 400;
    font-style: italic;
    font-size: clamp(2.8rem, 6vw, 5.5rem);
    letter-spacing: -0.02em;
    color: var(--ice-white);
    margin-bottom: 3rem;
    line-height: 1.1;
    opacity: 0;
    transition: opacity 0.5s ease;
}

.closing-title.is-visible {
    opacity: 1;
}

.glass-card--closing {
    text-align: left;
}

.contact-row {
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid rgba(255, 255, 255, 0.15);
}

.contact-item {
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: 0.85rem;
    letter-spacing: 0.04em;
    color: var(--frost-blue);
}

/* =========================================
   Particle Canvas
   ========================================= */
#particleCanvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 50;
    opacity: 0.5;
}

/* =========================================
   Line Draw Animation (Grid Lines)
   ========================================= */
.line-draw {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
    opacity: 0.15;
}

/* =========================================
   Responsive
   ========================================= */
@media (max-width: 1024px) {
    .concept-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .glass-card--concept {
        position: relative;
        top: auto;
        height: 350px;
    }

    .capability-card {
        margin-left: 0 !important;
    }
}

@media (max-width: 768px) {
    .section {
        padding: 5vw;
    }

    .hero-title {
        font-size: clamp(2.2rem, 8vw, 3.5rem);
        padding-top: 50%;
    }

    .glass-card--opening {
        position: relative;
        top: auto;
        right: auto;
        margin-top: 2rem;
        max-width: 100%;
    }

    .opening-content {
        padding-bottom: 8vh;
    }

    .capability-card {
        margin-left: 0 !important;
        margin-bottom: 24px;
    }

    #capabilities {
        min-height: auto;
    }

    .process-step {
        padding-bottom: 60px;
    }

    .process-timeline {
        display: none;
    }

    .step-marker {
        display: none;
    }

    .process-step {
        gap: 0;
    }
}