/* =============================================
   addrproxy.com — Isometric Network Operations Center
   Technical illustration meets proxy architecture
   ============================================= */

:root {
    --deep-slate: #1B2432;
    --warm-graphite: #2C3E50;
    --seafoam: #7ECEC6;
    --amber-signal: #E8A838;
    --pale-blueprint: #C8D6E5;
    --bright-white: #F0F4F8;
    --muted-lavender: #8395A7;
    --packet-glow: #5DADE2;

    --font-display: 'Space Grotesk', sans-serif;
    --font-body: 'Inter', sans-serif;
    --font-mono: 'IBM Plex Mono', monospace;
}

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

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    background-color: var(--deep-slate);
    color: var(--pale-blueprint);
    font-family: var(--font-body);
    font-size: 17px;
    line-height: 1.65;
    overflow-x: hidden;
}

/* --- Blueprint Grid --- */
.blueprint-grid {
    position: fixed;
    inset: 0;
    background:
        repeating-linear-gradient(0deg, transparent, transparent 47px, var(--warm-graphite) 47px, var(--warm-graphite) 48px),
        repeating-linear-gradient(90deg, transparent, transparent 47px, var(--warm-graphite) 47px, var(--warm-graphite) 48px);
    opacity: 0.15;
    pointer-events: none;
    z-index: 0;
}

/* --- Navigation Rail --- */
.nav-rail {
    position: fixed;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    z-index: 100;
}

.rail-label {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.08em;
    color: var(--muted-lavender);
    writing-mode: vertical-rl;
    transform: rotate(180deg);
    margin-bottom: 1rem;
}

.rail-line {
    width: 2px;
    height: 80px;
    background: var(--warm-graphite);
    position: relative;
    border-radius: 1px;
}

.rail-fill {
    position: absolute;
    bottom: 0;
    width: 100%;
    height: 0%;
    background: var(--seafoam);
    border-radius: 1px;
    transition: height 0.3s ease;
}

.rail-diamond {
    cursor: pointer;
    position: relative;
}

.diamond-icon {
    display: block;
    width: 8px;
    height: 8px;
    background: var(--warm-graphite);
    transform: rotate(45deg);
    transition: background 0.3s ease, box-shadow 0.3s ease;
}

.rail-diamond.active .diamond-icon {
    background: var(--seafoam);
    box-shadow: 0 0 8px rgba(126, 206, 198, 0.5);
}

.rail-diamond:hover .diamond-icon {
    background: var(--amber-signal);
}

/* --- Floors (Sections) --- */
.floor {
    min-height: 100vh;
    position: relative;
    z-index: 5;
    padding: 8rem 120px;
}

.floor-tall {
    min-height: 150vh;
}

/* --- Isometric Scene (Rooftop) --- */
.rooftop-scene {
    position: relative;
    width: 100%;
    height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.iso-block {
    position: absolute;
    width: 80px;
    height: 80px;
    transform-style: preserve-3d;
    opacity: 0;
    animation: blockAssemble 0.5s ease-out forwards;
}

.iso-block .face {
    position: absolute;
    border: 1px solid var(--muted-lavender);
}

.face-top {
    width: 80px;
    height: 40px;
    background: var(--warm-graphite);
    transform: rotateX(60deg) translateZ(40px);
    opacity: 0.9;
}

.face-left {
    width: 40px;
    height: 80px;
    background: var(--deep-slate);
    transform: rotateY(-30deg) translateZ(20px);
    opacity: 0.7;
}

.face-right {
    width: 40px;
    height: 80px;
    background: #243242;
    transform: rotateY(30deg) translateZ(20px);
    opacity: 0.8;
}

.block-1 { left: 25%; top: 30%; animation-delay: 0.3s; }
.block-2 { left: 40%; top: 20%; animation-delay: 0.35s; }
.block-3 { left: 55%; top: 35%; animation-delay: 0.4s; }
.block-4 { left: 35%; top: 50%; animation-delay: 0.45s; }
.block-5 { left: 60%; top: 25%; animation-delay: 0.5s; }

@keyframes blockAssemble {
    0% { opacity: 0; transform: translate(-40px, -40px); }
    100% { opacity: 1; transform: translate(0, 0); }
}

.iso-title {
    font-family: var(--font-display);
    font-size: clamp(3rem, 8vw, 5rem);
    font-weight: 700;
    letter-spacing: 0.08em;
    color: var(--bright-white);
    text-shadow: 4px 4px 0 var(--warm-graphite), 8px 8px 0 rgba(27, 36, 50, 0.5);
    position: relative;
    z-index: 10;
}

/* --- Luminous Packet --- */
.packet {
    position: absolute;
    width: 16px;
    height: 16px;
    background: var(--packet-glow);
    box-shadow: 0 0 8px rgba(93, 173, 226, 0.5), 0 0 24px rgba(93, 173, 226, 0.2);
    transform: rotate(45deg);
    animation: packetPulse 2s ease-in-out infinite, packetMove 8s linear infinite;
    z-index: 20;
    top: 30%;
    left: 20%;
}

@keyframes packetPulse {
    0%, 100% { opacity: 0.8; }
    50% { opacity: 1; }
}

@keyframes packetMove {
    0% { left: 20%; top: 30%; }
    25% { left: 40%; top: 22%; }
    50% { left: 55%; top: 35%; }
    75% { left: 65%; top: 25%; }
    100% { left: 20%; top: 30%; }
}

/* --- Split Layout --- */
.split-layout {
    display: flex;
    gap: 5%;
    align-items: flex-start;
    max-width: 1100px;
    margin: 0 auto;
}

.iso-diagram,
.envelope-scene {
    flex: 0 0 55%;
}

.content-column {
    flex: 0 0 40%;
    position: relative;
}

.sep-line {
    width: 1px;
    height: 100%;
    background: var(--muted-lavender);
    opacity: 0.2;
    position: absolute;
    left: -5%;
    top: 0;
}

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

.routing-packet {
    animation: routePacket 4s ease-in-out infinite;
}

@keyframes routePacket {
    0% { cx: 20; cy: 150; }
    40% { cx: 200; cy: 150; }
    100% { cx: 380; cy: 150; }
}

/* --- Section Headings --- */
.section-heading {
    font-family: var(--font-display);
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    font-weight: 500;
    letter-spacing: 0.02em;
    color: var(--bright-white);
    margin-bottom: 1.5rem;
}

.body-text {
    font-family: var(--font-body);
    font-size: 17px;
    line-height: 1.65;
    color: var(--pale-blueprint);
    margin-bottom: 1.2rem;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* --- Address Transform Diagram --- */
.addr-transform {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.transform-step {
    text-align: center;
}

.step-label {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.1em;
    color: var(--muted-lavender);
    text-transform: uppercase;
    display: block;
    margin-bottom: 4px;
}

.addr-code {
    font-family: var(--font-mono);
    font-size: 14px;
    color: var(--pale-blueprint);
    background: var(--warm-graphite);
    padding: 4px 10px;
    border: 1px solid var(--muted-lavender);
    border-radius: 2px;
}

.addr-code.highlight {
    color: var(--amber-signal);
    border-color: var(--amber-signal);
}

.transform-arrow {
    font-size: 20px;
    color: var(--seafoam);
}

/* --- Envelope Motif --- */
.envelope-scene {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    padding: 2rem 0;
}

.envelope {
    max-width: 300px;
}

.env-body {
    background: var(--warm-graphite);
    border: 1px solid var(--muted-lavender);
    padding: 1.5rem;
    position: relative;
    clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
    transition: clip-path 0.6s ease;
}

.env-flap {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 30px;
    background: var(--deep-slate);
    border-bottom: 1px solid var(--muted-lavender);
    clip-path: polygon(0 0, 50% 100%, 100% 0);
    transition: clip-path 0.6s ease;
}

.env-addr {
    font-family: var(--font-mono);
    font-size: 13px;
    display: block;
    margin-top: 1rem;
}

.env-addr.original {
    color: var(--pale-blueprint);
}

.env-addr.masked {
    color: var(--amber-signal);
    display: none;
}

.envelope.opened .env-addr.original { display: none; }
.envelope.opened .env-addr.masked { display: block; }

/* --- Tunnel --- */
#tunnel {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.tunnel-viewport {
    width: 100%;
    max-width: 600px;
    height: 300px;
    perspective: 800px;
    position: relative;
    margin-bottom: 3rem;
    overflow: hidden;
}

.tunnel-perspective {
    width: 100%;
    height: 100%;
    position: relative;
    transform-style: preserve-3d;
}

.tunnel-arch {
    position: absolute;
    left: 50%;
    top: 50%;
    border: 2px solid var(--seafoam);
    border-radius: 50% 50% 0 0;
    transform: translate(-50%, -50%) translateZ(calc(var(--depth) * -60px));
    width: calc(280px - var(--depth) * 20px);
    height: calc(200px - var(--depth) * 14px);
    opacity: calc(1 - var(--depth) * 0.07);
}

.tunnel-packets {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.t-packet {
    display: block;
    width: 10px;
    height: 10px;
    background: var(--packet-glow);
    box-shadow: 0 0 8px rgba(93, 173, 226, 0.5), 0 0 24px rgba(93, 173, 226, 0.2);
    transform: rotate(45deg);
    margin-bottom: 20px;
    animation: tunnelFlow 3s linear infinite;
}

.t-packet:nth-child(2) { animation-delay: 0.8s; }
.t-packet:nth-child(3) { animation-delay: 1.6s; }

@keyframes tunnelFlow {
    0% { transform: rotate(45deg) scale(1); opacity: 1; }
    100% { transform: rotate(45deg) scale(0.1); opacity: 0; }
}

.tunnel-text {
    font-family: var(--font-display);
    font-size: clamp(1.2rem, 3vw, 1.8rem);
    font-weight: 500;
    color: var(--bright-white);
    text-align: center;
    max-width: 600px;
    opacity: 0;
    transition: opacity 0.8s ease;
}

.tunnel-text.visible {
    opacity: 0.9;
}

/* --- Foundation (Footer) --- */
.foundation {
    min-height: 40vh;
    padding: 4rem 120px;
    background:
        repeating-linear-gradient(0deg, transparent, transparent 47px, rgba(44, 62, 80, 0.2) 47px, rgba(44, 62, 80, 0.2) 48px),
        repeating-linear-gradient(90deg, transparent, transparent 47px, rgba(44, 62, 80, 0.2) 47px, rgba(44, 62, 80, 0.2) 48px);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.footer-heading {
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--seafoam);
    display: block;
    margin-bottom: 1rem;
}

.footer-link {
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--muted-lavender);
    display: block;
    margin-bottom: 0.5rem;
    cursor: pointer;
    transition: color 0.2s ease;
    position: relative;
    padding-left: 0;
}

.footer-link::before {
    content: '';
    display: inline-block;
    width: 0;
    height: 0;
    background: var(--amber-signal);
    transform: rotate(45deg);
    margin-right: 0;
    transition: width 0.2s ease, height 0.2s ease, margin-right 0.2s ease;
    vertical-align: middle;
}

.footer-link:hover {
    color: var(--bright-white);
}

.footer-link:hover::before {
    width: 6px;
    height: 6px;
    margin-right: 8px;
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .nav-rail { display: none; }
    .floor { padding: 4rem 1.5rem; }
    .foundation { padding: 3rem 1.5rem; }

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

    .iso-diagram,
    .envelope-scene,
    .content-column {
        flex: 1;
    }

    .sep-line { display: none; }
    .footer-grid { grid-template-columns: 1fr; }
}