:root {
    --bg-primary: #0A0F14;
    --bg-secondary: #111A24;
    --phosphor-green: #3BF4A8;
    --signal-amber: #F4A83B;
    --muted-silver: #B0BEC5;
    --deep-teal: #0D3B3E;
    --wire-red: #E84855;
    --ghost-white: #E8ECF1;

    --font-heading: 'Share Tech Mono', monospace;
    --font-body: 'IBM Plex Sans', sans-serif;
    --font-accent: 'Overpass Mono', monospace;

    --ease-enter: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-exit: cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    background: var(--bg-primary);
    color: var(--muted-silver);
    font-family: var(--font-body);
    font-weight: 300;
    font-size: clamp(0.95rem, 1.1vw, 1.1rem);
    line-height: 1.72;
    overflow-x: hidden;
}

/* ===== Sidebar ===== */
.sidebar {
    position: fixed;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 60px;
    z-index: 100;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    padding: 1rem 0;
}

.sidebar-node {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    cursor: pointer;
}

.node-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--muted-silver);
    opacity: 0.3;
    transition: background 300ms var(--ease-enter), opacity 300ms var(--ease-enter), box-shadow 300ms var(--ease-enter);
}

.sidebar-node.active .node-dot {
    background: var(--phosphor-green);
    opacity: 1;
    box-shadow: 0 0 8px rgba(59, 244, 168, 0.6);
    animation: nodePulse 2s ease-in-out infinite;
}

.node-label {
    font-family: var(--font-accent);
    font-size: 0.6rem;
    letter-spacing: 0.1em;
    color: var(--muted-silver);
    opacity: 0.4;
    transition: opacity 300ms var(--ease-enter);
}

.sidebar-node.active .node-label {
    opacity: 1;
    color: var(--phosphor-green);
}

.sidebar-trace {
    position: absolute;
    top: 1rem;
    bottom: 1rem;
    left: 50%;
    width: 1px;
    background: linear-gradient(to bottom, transparent, rgba(59, 244, 168, 0.15), transparent);
    z-index: -1;
}

@keyframes nodePulse {
    0%, 100% { box-shadow: 0 0 8px rgba(59, 244, 168, 0.4); }
    50% { box-shadow: 0 0 16px rgba(59, 244, 168, 0.8); }
}

/* ===== Intercept Layer ===== */
.intercept-layer {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 50;
    overflow: hidden;
}

.data-fragment {
    position: absolute;
    font-family: var(--font-accent);
    font-size: 0.7rem;
    color: var(--phosphor-green);
    opacity: 0;
    white-space: nowrap;
    animation: fragmentRise linear forwards;
}

@keyframes fragmentRise {
    0% { opacity: 0; transform: translateY(0); }
    10% { opacity: 0.25; }
    80% { opacity: 0.25; }
    100% { opacity: 0; transform: translateY(-110vh); }
}

/* ===== Hop Sections ===== */
.hop {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hop-inner {
    position: relative;
    width: 100%;
    max-width: 1000px;
    padding: 4rem 5rem;
    z-index: 2;
}

/* ===== Hop 01: Origin ===== */
.hop-01 {
    background: var(--bg-primary);
}

.oscilloscope-wave {
    width: 100%;
    height: 60px;
    margin-bottom: 2rem;
}

.wave-path {
    stroke-dasharray: 2400;
    stroke-dashoffset: 2400;
    transition: stroke-dashoffset 2s ease-out;
}

.wave-path.drawn {
    stroke-dashoffset: 0;
}

@keyframes waveUndulate {
    0%, 100% { transform: scaleY(1); }
    50% { transform: scaleY(0.85); }
}

.oscilloscope-wave.animated {
    animation: waveUndulate 3s ease-in-out infinite;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: clamp(1.8rem, 4vw, 3.2rem);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--phosphor-green);
    min-height: 1.5em;
    margin-bottom: 1rem;
}

.hero-title .char {
    display: inline;
    opacity: 0;
    animation: charAppear 60ms forwards;
}

@keyframes charAppear {
    to { opacity: 1; }
}

.hero-subtitle {
    font-family: var(--font-body);
    font-weight: 300;
    font-size: 1.1rem;
    color: var(--ghost-white);
    opacity: 0;
    transition: opacity 600ms var(--ease-enter);
}

.hero-subtitle.visible {
    opacity: 0.7;
}

.circuit-trace.trace-down {
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 100px;
}

/* CRT flicker */
@keyframes crtFlicker {
    0% { opacity: 1; }
    50% { opacity: 0.7; }
    100% { opacity: 1; }
}

.flicker {
    animation: crtFlicker 150ms ease-in-out;
}

/* ===== Hop 02: Encapsulation ===== */
.hop-02 {
    background: var(--bg-secondary);
}

.relay-blocks {
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
}

.relay-node-block {
    background: var(--bg-primary);
    border: 1px solid rgba(59, 244, 168, 0.15);
    padding: 2rem;
    clip-path: polygon(12px 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%, 0 12px);
    opacity: 0;
    transform: translateX(-30px);
    transition: opacity 500ms var(--ease-enter), transform 500ms var(--ease-enter);
}

.relay-node-block:nth-child(2) { transform: translateX(30px); margin-left: 40px; }
.relay-node-block:nth-child(3) { transform: translateX(-30px); margin-left: 80px; }

.relay-node-block.revealed {
    opacity: 1;
    transform: translateX(0) !important;
}

.block-label {
    font-family: var(--font-accent);
    font-size: 0.7rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--phosphor-green);
    opacity: 0.6;
    display: block;
    margin-bottom: 0.75rem;
}

.redaction-wrapper {
    position: relative;
    overflow: hidden;
}

.block-text {
    font-family: var(--font-body);
    font-weight: 300;
    color: var(--muted-silver);
    max-width: 58ch;
    line-height: 1.72;
}

.redaction-bar {
    position: absolute;
    inset: 0;
    background: var(--bg-primary);
    transition: opacity 400ms ease-out;
}

.relay-node-block.revealed .redaction-bar {
    opacity: 0;
}

/* ===== Hop 03: Transit ===== */
.hop-03 {
    background: radial-gradient(circle at center, var(--deep-teal), var(--bg-primary) 70%);
}

.node-diagram {
    position: relative;
    width: 100%;
    max-width: 600px;
    margin: 0 auto 2rem;
}

.node-svg {
    width: 100%;
    height: auto;
}

.net-node {
    transition: fill 300ms var(--ease-enter), r 200ms var(--ease-enter);
}

.net-node.active {
    fill: var(--phosphor-green);
}

.net-node.amber-pulse {
    fill: var(--signal-amber);
}

.node-annotations {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.node-annot {
    position: absolute;
    font-family: var(--font-accent);
    font-size: 0.65rem;
    color: var(--phosphor-green);
    opacity: 0;
    transition: opacity 300ms var(--ease-enter);
}

.node-annot.visible {
    opacity: 0.7;
}

.transit-text {
    text-align: center;
    font-family: var(--font-body);
    font-weight: 300;
    color: var(--muted-silver);
    max-width: 50ch;
    margin: 0 auto;
    opacity: 0;
    transform: translateY(15px);
    transition: opacity 500ms var(--ease-enter), transform 500ms var(--ease-enter);
}

.transit-text.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== Hop 04: Relay ===== */
.hop-04 {
    background: var(--bg-primary);
}

.hop-split {
    display: flex;
    gap: 0;
    align-items: stretch;
    padding: 0;
}

.split-left {
    flex: 0 0 40%;
    position: relative;
    overflow: hidden;
    min-height: 100vh;
}

.intercept-concentrated {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.split-divider {
    flex: 0 0 20px;
    display: flex;
    align-items: stretch;
}

.vert-wave {
    width: 20px;
    height: 100%;
}

.split-right {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 4rem 3rem;
}

.relay-quote {
    margin-bottom: 2rem;
}

.relay-quote p {
    font-family: var(--font-heading);
    font-size: clamp(1.4rem, 2.5vw, 2.4rem);
    color: var(--ghost-white);
    letter-spacing: 0.04em;
    line-height: 1.4;
}

.relay-quote .word {
    display: inline-block;
    opacity: 0;
    transition: opacity 150ms var(--ease-enter);
    margin-right: 0.3em;
}

.relay-quote .word.visible {
    opacity: 1;
}

.relay-body {
    font-family: var(--font-body);
    font-weight: 300;
    color: var(--muted-silver);
    max-width: 50ch;
    line-height: 1.72;
}

/* ===== Hop 05: Decryption ===== */
.hop-05 {
    background: var(--bg-primary);
}

.decrypt-block {
    width: 60vw;
    min-height: 40vh;
    margin: 0 auto;
    padding: 3rem;
    border: 1px dashed var(--phosphor-green);
    clip-path: polygon(20px 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%, 0 20px);
    opacity: 0;
    transition: opacity 600ms var(--ease-enter);
    display: flex;
    flex-direction: column;
    justify-content: center;
    animation: borderDash 4s linear infinite paused;
    background: var(--bg-secondary);
}

.decrypt-block.visible {
    opacity: 1;
    animation-play-state: running;
}

@keyframes borderDash {
    to { border-color: var(--signal-amber); }
}

.decrypt-text {
    font-family: var(--font-body);
    font-weight: 300;
    color: var(--muted-silver);
    max-width: 58ch;
    line-height: 1.72;
    min-height: 6em;
}

/* ===== Hop 06: Terminus ===== */
.hop-06 {
    background: var(--bg-primary);
}

.hop-06 .hop-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

.terminus-point {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--phosphor-green);
    opacity: 0;
    transition: opacity 600ms var(--ease-enter);
}

.terminus-point.visible {
    opacity: 1;
    animation: terminusPulse 2s ease-in-out infinite;
}

@keyframes terminusPulse {
    0%, 100% { transform: scale(1); box-shadow: 0 0 12px rgba(59, 244, 168, 0.4); }
    50% { transform: scale(1.15); box-shadow: 0 0 24px rgba(59, 244, 168, 0.7); }
}

.terminus-title {
    font-family: var(--font-heading);
    font-size: 2rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--phosphor-green);
    opacity: 0;
    transition: opacity 600ms var(--ease-enter);
}

.terminus-title.visible {
    opacity: 1;
}

.terminus-wave {
    width: 100%;
    height: 4px;
    opacity: 0;
    transition: opacity 800ms var(--ease-enter);
}

.terminus-wave.visible {
    opacity: 1;
}

.terminus-links {
    display: flex;
    gap: 2rem;
}

.terminus-link {
    font-family: var(--font-heading);
    font-size: 0.8rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--muted-silver);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border: 1px solid rgba(59, 244, 168, 0.2);
    clip-path: polygon(6px 0, 100% 0, 100% calc(100% - 6px), calc(100% - 6px) 100%, 0 100%, 0 6px);
    transition: color 300ms var(--ease-enter), border-color 300ms var(--ease-enter);
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 400ms var(--ease-enter), transform 400ms var(--ease-enter), color 300ms var(--ease-enter), border-color 300ms var(--ease-enter);
}

.terminus-link.visible {
    opacity: 1;
    transform: translateY(0);
}

.terminus-link:hover {
    color: var(--phosphor-green);
    border-color: var(--phosphor-green);
}

/* ===== Diagonal Section Cuts ===== */
.hop-02::before {
    content: '';
    position: absolute;
    top: -40px;
    left: 0;
    right: 0;
    height: 80px;
    background: var(--bg-secondary);
    transform: skewY(-3deg);
    z-index: 1;
}

.hop-03::before {
    content: '';
    position: absolute;
    top: -40px;
    left: 0;
    right: 0;
    height: 80px;
    background: var(--bg-primary);
    transform: skewY(3deg);
    z-index: 1;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .hop-inner {
        padding: 3rem 2rem;
    }

    .hop-split {
        flex-direction: column;
    }

    .split-left {
        flex: none;
        min-height: 30vh;
    }

    .split-divider {
        display: none;
    }

    .split-right {
        padding: 2rem;
    }

    .decrypt-block {
        width: 90vw;
    }

    .sidebar {
        display: none;
    }
}

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}