:root {
    --sentinel-bg: #02070b;
    --sentinel-panel: rgba(3, 13, 20, 0.82);
    --sentinel-line: rgba(84, 224, 255, 0.25);
    --sentinel-cyan: #54e0ff;
    --sentinel-blue: #4f8cff;
    --sentinel-green: #43f5a0;
    --sentinel-yellow: #ffd95c;
    --sentinel-text: #eefcff;
    --sentinel-muted: #8ca8b3;
    --sentinel-danger: #ff647c;
}

* {
    box-sizing: border-box;
}

html {
    min-width: 320px;
    background: var(--sentinel-bg);
}

body {
    margin: 0;
    overflow-x: hidden;
    background: var(--sentinel-bg);
    color: var(--sentinel-text);
    font-family: Tahoma, "Noto Sans Thai", Arial, sans-serif;
}

button,
a {
    -webkit-tap-highlight-color: transparent;
}

.skip-link {
    position: fixed;
    z-index: 9999;
    top: 12px;
    left: 12px;
    padding: 10px 14px;
    transform: translateY(-160%);
    border: 1px solid var(--sentinel-cyan);
    background: var(--sentinel-bg);
    color: var(--sentinel-text);
}

.skip-link:focus {
    transform: translateY(0);
}

.site-bg {
    position: fixed;
    z-index: 0;
    inset: 0;
    overflow: hidden;
    background: var(--sentinel-bg);
}

.site-bg > img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    filter: saturate(0.78) contrast(1.08) brightness(0.73);
    transform: scale(1.025);
    animation: background-breathe 15s ease-in-out infinite alternate;
}

.bg-shade,
.grid-layer,
.scan-line,
.particles {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.bg-shade {
    background:
        linear-gradient(90deg, rgba(2, 7, 11, 0.98) 0%, rgba(2, 7, 11, 0.88) 42%, rgba(2, 7, 11, 0.26) 74%, rgba(2, 7, 11, 0.54) 100%),
        linear-gradient(180deg, rgba(2, 7, 11, 0.68), transparent 38%, rgba(2, 7, 11, 0.88) 100%),
        radial-gradient(circle at 78% 42%, rgba(84, 224, 255, 0.11), transparent 28%);
}

.grid-layer {
    opacity: 0.28;
    background-image:
        linear-gradient(rgba(84, 224, 255, 0.07) 1px, transparent 1px),
        linear-gradient(90deg, rgba(84, 224, 255, 0.07) 1px, transparent 1px);
    background-size: 56px 56px;
    mask-image: linear-gradient(90deg, #000, transparent 78%);
}

.scan-line {
    top: -18%;
    bottom: auto;
    height: 26%;
    background: linear-gradient(180deg, transparent, rgba(84, 224, 255, 0.08), transparent);
    animation: scan-page 7s linear infinite;
}

.particles span {
    position: absolute;
    width: 3px;
    height: 3px;
    border-radius: 50%;
    background: var(--sentinel-cyan);
    box-shadow: 0 0 12px var(--sentinel-cyan);
    opacity: 0;
    animation: particle-rise var(--duration, 8s) linear var(--delay, 0s) infinite;
}

.topbar {
    position: fixed;
    z-index: 30;
    top: 0;
    right: 0;
    left: 0;
    min-height: 78px;
    padding: 14px 24px;
    border-bottom: 1px solid var(--sentinel-line);
    background: linear-gradient(180deg, rgba(2, 7, 11, 0.93), rgba(2, 7, 11, 0.68));
    backdrop-filter: blur(16px);
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    color: var(--sentinel-text);
    text-decoration: none;
}

.brand:hover {
    color: var(--sentinel-text);
}

.brand-icon {
    display: grid;
    width: 42px;
    height: 36px;
    place-items: center;
    border: 1px solid var(--sentinel-cyan);
    border-radius: 4px;
    box-shadow: inset 0 0 18px rgba(84, 224, 255, 0.08), 0 0 18px rgba(84, 224, 255, 0.09);
    color: var(--sentinel-cyan);
    font-family: Consolas, Monaco, monospace;
    font-size: 13px;
    font-weight: 700;
}

.brand > span:last-child {
    display: grid;
    grid-template-columns: auto auto;
    line-height: 1;
}

.brand strong,
.brand b {
    font-size: 16px;
    letter-spacing: 0.04em;
}

.brand b {
    color: var(--sentinel-cyan);
}

.brand small {
    grid-column: 1 / -1;
    margin-top: 6px;
    color: var(--sentinel-muted);
    font-family: Consolas, Monaco, monospace;
    font-size: 8px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.system-pill {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    padding: 9px 12px;
    border: 1px solid rgba(67, 245, 160, 0.38);
    border-radius: 999px;
    background: rgba(67, 245, 160, 0.05);
    color: var(--sentinel-green);
    font-family: Consolas, Monaco, monospace;
    font-size: 9px;
    letter-spacing: 0.08em;
}

.system-pill i,
.live-dot,
.viewer-status i,
.modal-footer i {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--sentinel-green);
    box-shadow: 0 0 12px var(--sentinel-green);
    animation: status-pulse 2s ease-in-out infinite;
}

.system-pill.offline {
    border-color: rgba(255, 100, 124, 0.4);
    color: var(--sentinel-danger);
}

.system-pill.offline i {
    background: var(--sentinel-danger);
    box-shadow: 0 0 12px var(--sentinel-danger);
}

.hero-shell {
    position: relative;
    z-index: 5;
    padding-top: 76px;
    padding-bottom: 90px;
}

.hero-card {
    max-width: 760px;
    padding: clamp(28px, 5vw, 56px);
    border: 1px solid rgba(84, 224, 255, 0.18);
    border-left: 3px solid var(--sentinel-cyan);
    border-radius: 5px;
    background:
        linear-gradient(110deg, rgba(84, 224, 255, 0.045), transparent 60%),
        rgba(2, 9, 14, 0.68);
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.38);
    backdrop-filter: blur(12px);
}

.eyebrow {
    display: flex;
    align-items: center;
    gap: 11px;
    margin: 0 0 18px;
    color: var(--sentinel-green);
    font-family: Consolas, Monaco, monospace;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.13em;
}

.hero-card h1 {
    max-width: 720px;
    margin: 0;
    font-size: clamp(44px, 6vw, 82px);
    font-weight: 900;
    line-height: 1.02;
    letter-spacing: -0.055em;
    text-wrap: balance;
}

.hero-card h1 span {
    display: block;
    margin-top: 8px;
    color: var(--sentinel-cyan);
    text-shadow: 0 0 34px rgba(84, 224, 255, 0.14);
}

.hero-lead {
    max-width: 650px;
    margin: 26px 0 0;
    color: #c6d8de;
    font-size: clamp(16px, 1.5vw, 20px);
    line-height: 1.85;
}

.command-line {
    display: flex;
    min-height: 52px;
    align-items: center;
    margin-top: 30px;
    padding: 0 17px;
    overflow: hidden;
    border: 1px solid rgba(84, 224, 255, 0.24);
    border-radius: 4px;
    background: rgba(0, 5, 8, 0.82);
    color: #c7d3d7;
    font-family: Consolas, Monaco, monospace;
    font-size: 12px;
    white-space: nowrap;
}

.prompt {
    margin-right: 9px;
    color: var(--sentinel-green);
}

.cursor {
    display: inline-block;
    width: 7px;
    height: 15px;
    margin-left: 3px;
    background: var(--sentinel-cyan);
    animation: cursor-blink 1s steps(1) infinite;
}

.btn-launch,
.btn-status {
    min-height: 54px;
    padding-inline: 24px;
    border-radius: 4px;
    font-weight: 800;
}

.btn-launch {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 28px;
    border: 1px solid var(--sentinel-green);
    background: linear-gradient(135deg, var(--sentinel-green), #20c982);
    box-shadow: 0 12px 36px rgba(67, 245, 160, 0.15);
    color: #001c12;
}

.btn-launch:hover,
.btn-launch:focus {
    border-color: #79ffc0;
    background: #79ffc0;
    box-shadow: 0 16px 44px rgba(67, 245, 160, 0.24);
    color: #001c12;
    transform: translateY(-2px);
}

.btn-status {
    border: 1px solid rgba(84, 224, 255, 0.54);
    background: rgba(2, 9, 14, 0.68);
    color: var(--sentinel-text);
}

.btn-status:hover,
.btn-status:focus {
    border-color: var(--sentinel-cyan);
    background: rgba(84, 224, 255, 0.09);
    color: var(--sentinel-cyan);
}

.launch-note {
    margin: 13px 0 0;
    color: var(--sentinel-muted);
    font-size: 11px;
}

.sentinel-console {
    margin-left: 36px;
    overflow: hidden;
    border: 1px solid rgba(84, 224, 255, 0.3);
    border-radius: 6px;
    background: rgba(2, 9, 14, 0.75);
    box-shadow: 0 24px 70px rgba(0, 0, 0, 0.38);
    font-family: Consolas, Monaco, monospace;
    backdrop-filter: blur(10px);
}

.console-head {
    display: flex;
    min-height: 46px;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    border-bottom: 1px solid var(--sentinel-line);
    color: var(--sentinel-cyan);
    font-size: 10px;
    letter-spacing: 0.12em;
}

.console-head b {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--sentinel-green);
    font-size: 8px;
}

.console-head b i {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: currentColor;
    box-shadow: 0 0 10px currentColor;
}

.console-body {
    padding: 22px;
}

.rack-map {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
}

.rack-node {
    position: relative;
    display: grid;
    min-height: 68px;
    place-items: center;
    overflow: hidden;
    border: 1px solid rgba(84, 224, 255, 0.24);
    background: rgba(84, 224, 255, 0.035);
    color: var(--sentinel-muted);
    font-size: 9px;
}

.rack-node::before {
    position: absolute;
    right: 7px;
    bottom: 7px;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--sentinel-green);
    box-shadow: 0 0 8px var(--sentinel-green);
    content: "";
    animation: status-pulse 2s ease-in-out var(--delay) infinite;
}

.console-log {
    display: grid;
    gap: 8px;
    margin-top: 18px;
    padding: 15px;
    border: 1px solid rgba(84, 224, 255, 0.13);
    background: rgba(0, 4, 7, 0.65);
    color: #8ca8b3;
    font-size: 9px;
}

.console-log p {
    margin: 0;
}

.console-log p span {
    margin-right: 8px;
    color: var(--sentinel-cyan);
}

.console-log p.success {
    color: var(--sentinel-green);
}

.metric-dock {
    position: fixed;
    z-index: 20;
    right: 0;
    bottom: 0;
    left: 0;
    border-top: 1px solid var(--sentinel-line);
    background: rgba(2, 7, 11, 0.89);
    backdrop-filter: blur(16px);
}

.metric-item {
    min-height: 78px;
    padding: 13px 18px;
    border-left: 1px solid var(--sentinel-line);
    text-align: center;
}

.metric-item:first-child {
    border-left: 0;
}

.metric-item strong {
    color: var(--sentinel-cyan);
    font-family: Consolas, Monaco, monospace;
    font-size: clamp(22px, 3vw, 32px);
    line-height: 1;
}

.metric-item b {
    margin-left: 2px;
    color: var(--sentinel-green);
    font-family: Consolas, Monaco, monospace;
    font-size: 11px;
}

.metric-item small {
    display: block;
    margin-top: 7px;
    color: var(--sentinel-muted);
    font-family: Consolas, Monaco, monospace;
    font-size: 8px;
    letter-spacing: 0.08em;
}

.boot-screen {
    position: fixed;
    z-index: 1000;
    inset: 0;
    display: grid;
    place-items: center;
    background:
        radial-gradient(circle at center, rgba(84, 224, 255, 0.08), transparent 35%),
        #010407;
    transition: opacity 450ms ease, visibility 450ms ease;
}

.boot-screen.is-hidden {
    visibility: hidden;
    opacity: 0;
}

.boot-panel {
    width: min(520px, calc(100% - 40px));
    font-family: Consolas, Monaco, monospace;
    text-align: left;
}

.boot-brand {
    color: var(--sentinel-text);
    font-size: clamp(18px, 4vw, 28px);
    font-weight: 800;
    letter-spacing: 0.08em;
}

.boot-brand span {
    margin-right: 9px;
    color: var(--sentinel-cyan);
}

.boot-panel p {
    margin: 22px 0 10px;
    color: var(--sentinel-green);
    font-size: 10px;
    letter-spacing: 0.09em;
}

.boot-progress {
    height: 5px;
    overflow: hidden;
    background: rgba(84, 224, 255, 0.12);
}

.boot-progress span {
    display: block;
    width: 0;
    height: 100%;
    background: linear-gradient(90deg, var(--sentinel-blue), var(--sentinel-cyan), var(--sentinel-green));
    box-shadow: 0 0 16px var(--sentinel-cyan);
    transition: width 120ms linear;
}

.boot-skip {
    margin-top: 22px;
    padding: 8px 0;
    border: 0;
    border-bottom: 1px solid rgba(84, 224, 255, 0.35);
    background: transparent;
    color: var(--sentinel-muted);
    font-family: inherit;
    font-size: 9px;
    letter-spacing: 0.08em;
}

.boot-skip:hover {
    color: var(--sentinel-cyan);
}

.status-modal {
    border: 1px solid rgba(84, 224, 255, 0.32);
    border-radius: 6px;
    background: #071119;
    box-shadow: 0 30px 90px rgba(0, 0, 0, 0.6);
    color: var(--sentinel-text);
}

.status-modal .modal-header,
.status-modal .modal-footer {
    border-color: var(--sentinel-line);
}

.status-modal .modal-header small {
    color: var(--sentinel-cyan);
    font-family: Consolas, Monaco, monospace;
    font-size: 8px;
    letter-spacing: 0.1em;
}

.status-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    padding: 15px 0;
    border-bottom: 1px solid rgba(84, 224, 255, 0.11);
    color: #c7d9de;
    font-size: 13px;
}

.status-row:last-child {
    border-bottom: 0;
}

.status-row b {
    color: var(--sentinel-green);
    font-family: Consolas, Monaco, monospace;
    font-size: 9px;
}

.status-modal .modal-footer {
    justify-content: space-between;
}

.status-modal .modal-footer > span {
    display: flex;
    align-items: center;
    gap: 7px;
    color: var(--sentinel-muted);
    font-size: 10px;
}

.noscript-message {
    position: fixed;
    z-index: 2000;
    right: 12px;
    bottom: 12px;
    left: 12px;
    padding: 16px;
    border: 1px solid var(--sentinel-yellow);
    background: #111006;
    color: var(--sentinel-text);
    text-align: center;
}

.noscript-message a {
    color: var(--sentinel-yellow);
}

/* Viewer */
.viewer-page {
    height: 100vh;
    overflow: hidden;
}

.viewer-bar {
    position: relative;
    z-index: 20;
    display: grid;
    height: 58px;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    gap: 20px;
    padding: 0 16px;
    border-bottom: 1px solid var(--sentinel-line);
    background: #030a0f;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.viewer-brand {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    justify-self: start;
    color: var(--sentinel-text);
    font-family: Consolas, Monaco, monospace;
    font-size: 12px;
    text-decoration: none;
}

.viewer-brand > span {
    display: grid;
    width: 32px;
    height: 28px;
    place-items: center;
    border: 1px solid var(--sentinel-cyan);
    color: var(--sentinel-cyan);
    font-size: 10px;
}

.viewer-brand strong span {
    color: var(--sentinel-cyan);
}

.viewer-status {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--sentinel-green);
    font-family: Consolas, Monaco, monospace;
    font-size: 8px;
    letter-spacing: 0.1em;
}

.viewer-actions {
    display: flex;
    justify-self: end;
    gap: 7px;
}

.viewer-actions button,
.viewer-actions a {
    display: grid;
    width: 34px;
    height: 34px;
    place-items: center;
    border: 1px solid var(--sentinel-line);
    border-radius: 3px;
    background: rgba(84, 224, 255, 0.04);
    color: var(--sentinel-text);
    font-size: 17px;
    text-decoration: none;
}

.viewer-actions button:hover,
.viewer-actions a:hover {
    border-color: var(--sentinel-cyan);
    color: var(--sentinel-cyan);
}

.viewer-main {
    position: relative;
    height: calc(100vh - 58px);
    overflow: hidden;
    background:
        linear-gradient(rgba(84, 224, 255, 0.035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(84, 224, 255, 0.035) 1px, transparent 1px),
        var(--sentinel-bg);
    background-size: 42px 42px;
}

.viewer-main iframe {
    display: block;
    width: 100%;
    height: 100%;
    border: 0;
    background: var(--sentinel-bg);
    opacity: 0;
    transition: opacity 380ms ease;
}

.viewer-main iframe.is-ready {
    opacity: 1;
}

.frame-loader {
    position: absolute;
    z-index: 4;
    inset: 0;
    display: grid;
    place-content: center;
    justify-items: center;
    gap: 13px;
    background: var(--sentinel-bg);
    text-align: center;
    transition: opacity 300ms ease, visibility 300ms ease;
}

.frame-loader.is-hidden {
    visibility: hidden;
    opacity: 0;
}

.frame-loader strong {
    color: var(--sentinel-cyan);
    font-family: Consolas, Monaco, monospace;
    font-size: 11px;
    letter-spacing: 0.11em;
}

.frame-loader small {
    color: var(--sentinel-muted);
}

.loader-core {
    position: relative;
    width: 74px;
    height: 74px;
    border: 1px solid rgba(84, 224, 255, 0.25);
    border-radius: 50%;
}

.loader-core::before,
.loader-core::after {
    position: absolute;
    inset: 8px;
    border: 2px solid transparent;
    border-top-color: var(--sentinel-cyan);
    border-radius: 50%;
    content: "";
    animation: loader-spin 1.2s linear infinite;
}

.loader-core::after {
    inset: 20px;
    border-top-color: var(--sentinel-green);
    animation-direction: reverse;
    animation-duration: 0.8s;
}

.frame-error {
    position: absolute;
    z-index: 6;
    inset: 0;
    display: grid;
    place-content: center;
    justify-items: center;
    padding: 30px;
    background: var(--sentinel-bg);
    text-align: center;
}

.frame-error[hidden] {
    display: none;
}

.frame-error > span {
    display: grid;
    width: 58px;
    height: 58px;
    place-items: center;
    border: 1px solid var(--sentinel-danger);
    border-radius: 50%;
    color: var(--sentinel-danger);
    font-size: 26px;
}

.frame-error h1 {
    margin: 20px 0 8px;
    font-size: 24px;
}

.frame-error p {
    color: var(--sentinel-muted);
}

.frame-error button {
    margin-top: 12px;
    padding: 11px 18px;
    border: 1px solid var(--sentinel-cyan);
    background: rgba(84, 224, 255, 0.08);
    color: var(--sentinel-cyan);
}

@keyframes background-breathe {
    to {
        transform: scale(1.075);
    }
}

@keyframes scan-page {
    from {
        transform: translateY(-20vh);
    }
    to {
        transform: translateY(130vh);
    }
}

@keyframes particle-rise {
    0% {
        opacity: 0;
        transform: translateY(12vh);
    }
    15%,
    75% {
        opacity: 0.55;
    }
    100% {
        opacity: 0;
        transform: translateY(-80vh);
    }
}

@keyframes status-pulse {
    50% {
        opacity: 0.45;
        transform: scale(0.72);
    }
}

@keyframes cursor-blink {
    50% {
        opacity: 0;
    }
}

@keyframes loader-spin {
    to {
        transform: rotate(360deg);
    }
}

@media (max-width: 1199.98px) {
    .bg-shade {
        background:
            linear-gradient(90deg, rgba(2, 7, 11, 0.96), rgba(2, 7, 11, 0.62) 68%, rgba(2, 7, 11, 0.5)),
            linear-gradient(180deg, rgba(2, 7, 11, 0.64), transparent 34%, rgba(2, 7, 11, 0.92));
    }

    .hero-card {
        max-width: 800px;
    }
}

@media (max-width: 767.98px) {
    .topbar {
        min-height: 68px;
        padding-inline: 14px;
    }

    .brand strong,
    .brand b {
        font-size: 13px;
    }

    .brand small,
    .system-pill span {
        display: none;
    }

    .system-pill {
        padding: 10px;
    }

    .hero-shell {
        padding-top: 68px;
        padding-bottom: 126px;
    }

    .hero-card {
        padding: 26px 22px;
        background: rgba(2, 9, 14, 0.79);
    }

    .hero-card h1 {
        font-size: clamp(39px, 13vw, 62px);
    }

    .eyebrow {
        align-items: flex-start;
        font-size: 9px;
        line-height: 1.5;
    }

    .command-line {
        font-size: 10px;
    }

    .metric-dock {
        overflow-x: auto;
    }

    .metric-item {
        min-height: 86px;
        padding-inline: 6px;
    }

    .metric-item small {
        font-size: 7px;
    }

    .viewer-bar {
        grid-template-columns: auto 1fr auto;
        gap: 10px;
        padding-inline: 9px;
    }

    .viewer-brand strong,
    .viewer-status span {
        display: none;
    }

    .viewer-status {
        justify-self: center;
    }
}

@media (max-width: 420px) {
    .hero-card {
        border-left-width: 2px;
    }

    .hero-card h1 {
        font-size: 38px;
    }

    .prompt {
        display: none;
    }

    .viewer-actions button,
    .viewer-actions a {
        width: 31px;
        height: 31px;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.001ms !important;
    }

    .site-bg > img {
        transform: none;
    }
}