:root {
    --font-main: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'Space Grotesk', monospace;

    /* Dark Theme (Default) */
    --bg-base: #07090e;
    --bg-radial: radial-gradient(circle at 50% 50%, #0d121d 0%, #05070a 100%);
    --text-primary: #f3f5f9;
    --text-secondary: rgba(243, 245, 249, 0.65);
    --text-muted: rgba(243, 245, 249, 0.38);

    /* Flat State Tokens - Dark (More Translucent at Rest) */
    --glass-bg-flat: rgba(14, 19, 30, 0.14);
    --glass-border-flat: rgba(255, 255, 255, 0.07);
    --glass-shadow-flat: 0 4px 20px -2px rgba(0, 0, 0, 0.25),
        0 0 0 1px rgba(255, 255, 255, 0.04);

    /* Apple Glass Tokens - Dark (Popped-out Active) */
    --glass-bg: rgba(18, 24, 38, 0.55);
    --glass-border: rgba(255, 255, 255, 0.16);
    --glass-border-top: rgba(255, 255, 255, 0.36);
    --glass-shadow: 0 35px 95px -12px rgba(0, 0, 0, 0.85),
        0 0 0 1px rgba(255, 255, 255, 0.1),
        inset 0 1px 1px 0 rgba(255, 255, 255, 0.32),
        inset 0 -1px 1px 0 rgba(0, 0, 0, 0.3),
        0 0 55px var(--glass-glow);
    --glass-glow: rgba(99, 102, 241, 0.24);
    --glass-border-radius: 36px;
    --glass-border-radius-small: 28px;

    /* Accent Gradients */
    --brand-gradient: linear-gradient(135deg, #ffffff 0%, #d1d5db 45%, #818cf8 100%);
    --brand-glow: 0 0 45px rgba(129, 140, 248, 0.35);
    --badge-accent: #6366f1;

    /* Tile Ambient Pulse Tokens - Dark */
    --pulse-border: rgba(255, 255, 255, 0.16);
    --pulse-border-top: rgba(255, 255, 255, 0.42);
    --pulse-shadow: 0 12px 40px -4px rgba(0, 0, 0, 0.55),
        0 0 0 1px rgba(255, 255, 255, 0.12),
        0 0 45px rgba(99, 102, 241, 0.28),
        inset 0 1px 1px rgba(255, 255, 255, 0.22);
    --pulse-wave-border: rgba(255, 255, 255, 0.16);
    --pulse-wave-border-crest: rgba(255, 255, 255, 0.45);
    --pulse-wave-glow: rgba(99, 102, 241, 0.22);
    --pulse-wave-inner: rgba(255, 255, 255, 0.12);
    --pulse-wave-fill: rgba(255, 255, 255, 0.02);

    /* Toggle */
    --toggle-bg: rgba(255, 255, 255, 0.08);
    --toggle-border: rgba(255, 255, 255, 0.15);
    --toggle-color: #f3f5f9;
}

[data-theme="light"] {
    --bg-base: #f0f3f8;
    --bg-radial: radial-gradient(circle at 50% 50%, #f7f9fc 0%, #e2e7f0 100%);
    --text-primary: #0f172a;
    --text-secondary: rgba(15, 23, 42, 0.7);
    --text-muted: rgba(15, 23, 42, 0.42);

    /* Flat State Tokens - Light (More Translucent at Rest) */
    --glass-bg-flat: rgba(255, 255, 255, 0.22);
    /* --glass-border-flat: rgba(255, 255, 255, 0.45); */
    --glass-border-flat: rgba(120, 65, 65, 0.16);
    --glass-shadow-flat: 0 4px 20px -2px rgba(15, 23, 42, 0.04),
        0 0 0 1px rgba(255, 255, 255, 0.45);

    /* Apple Glass Tokens - Light (Popped-out Active) */
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.75);
    --glass-border-top: rgba(255, 255, 255, 0.98);
    --glass-shadow: 0 35px 85px -10px rgba(15, 23, 42, 0.18),
        0 0 0 1px rgba(255, 255, 255, 0.8),
        inset 0 1px 2px 0 rgba(255, 255, 255, 0.95),
        inset 0 -1px 2px 0 rgba(0, 0, 0, 0.04),
        0 0 45px var(--glass-glow);
    --glass-glow: rgba(99, 102, 241, 0.18);

    /* Tile Ambient Pulse Tokens - Light */
    --pulse-border: rgba(99, 102, 241, 0.25);
    --pulse-border-top: rgba(255, 255, 255, 0.95);
    --pulse-shadow: 0 12px 35px -4px rgba(15, 23, 42, 0.1),
        0 0 0 1px rgba(99, 102, 241, 0.25),
        0 0 35px rgba(99, 102, 241, 0.18),
        inset 0 1px 2px rgba(255, 255, 255, 0.85);
    --pulse-wave-border: rgba(125, 85, 225, 0.278);
    --pulse-wave-border-crest: rgba(245, 240, 255, 0.95);
    --pulse-wave-glow: rgba(97, 70, 171, 0.333);
    --pulse-wave-inner: rgba(235, 225, 255, 0.45);
    --pulse-wave-fill: rgba(124, 85, 225, 0.035);

    /* Accent Gradients */
    --brand-gradient: linear-gradient(135deg, #0f172a 0%, #334155 50%, #4338ca 100%);
    --brand-glow: 0 0 35px rgba(99, 102, 241, 0.2);
    --badge-accent: #4f46e5;

    /* Toggle */
    --toggle-bg: rgba(15, 23, 42, 0.06);
    --toggle-border: rgba(15, 23, 42, 0.12);
    --toggle-color: #0f172a;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

html,
body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: var(--font-main);
    background-color: var(--bg-base);
    color: var(--text-primary);
    transition: background-color 0.6s cubic-bezier(0.16, 1, 0.3, 1), color 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    user-select: none;
}

/* Ambient Animated Canvas */
#ambient-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 1;
    pointer-events: none;
}

/* Noise Texture Overlay for High-End Glass Look */
.noise-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 2;
    opacity: 0.035;
    pointer-events: none;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}

[data-theme="light"] .noise-overlay {
    opacity: 0.03;
}

/* Vignette & Atmospheric Glow */
.vignette {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 2;
    pointer-events: none;
    background: radial-gradient(circle at 50% 50%, transparent 40%, rgba(0, 0, 0, 0.4) 100%);
}

[data-theme="light"] .vignette {
    background: radial-gradient(circle at 50% 50%, transparent 50%, rgba(15, 23, 42, 0.08) 100%);
}

/* Main Container */
.viewport {
    position: relative;
    width: 100%;
    height: 100%;
    z-index: 10;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    perspective: 1200px;
}

/* Top Navigation Bar */
.top-bar {
    position: fixed;
    top: 24px;
    width: 100%;
    padding: 0 28px;
    /* right: 28px; */
    z-index: 50;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.top-bar-right {
    display: flex;
    align-items: center;
    justify-content: end;
    margin-left: auto;
    gap: 16px;
}

/* Live Status Pill */
.status-pill {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    border-radius: 999px;
    background: var(--toggle-bg);
    border: 1px solid var(--toggle-border);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    font-size: 0.75rem;
    font-family: var(--font-mono);
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-secondary);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

.status-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: #10b981;
    box-shadow: 0 0 10px #10b981, 0 0 20px #10b981;
    animation: pulse-dot 2.5s infinite cubic-bezier(0.47, 0, 0.16, 1);
}

@keyframes pulse-dot {

    0%,
    100% {
        opacity: 1;
        transform: scale(1);
    }

    50% {
        opacity: 0.45;
        transform: scale(0.85);
    }
}

/* Theme Switcher Button */
.theme-toggle-btn {
    position: relative;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--toggle-bg);
    border: 1px solid var(--toggle-border);
    border-top: 1px solid rgba(255, 255, 255, 0.22);
    color: var(--toggle-color);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12),
        inset 0 1px 1px rgba(255, 255, 255, 0.15);
    transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1),
        background 0.3s ease,
        border-color 0.3s ease,
        box-shadow 0.4s ease,
        color 0.3s ease;
    outline: none;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

/* Atmospheric Ambient Backlight Halo */
.theme-toggle-btn::before {
    content: '';
    position: absolute;
    inset: -3px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.45) 0%, rgba(99, 102, 241, 0) 70%);
    opacity: 0;
    transform: scale(0.8);
    transition: opacity 0.35s ease, transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    pointer-events: none;
    z-index: -1;
    filter: blur(8px);
}

[data-theme="light"] .theme-toggle-btn::before {
    background: radial-gradient(circle, rgba(99, 102, 241, 0.35) 0%, rgba(129, 140, 248, 0.15) 50%, transparent 70%);
}

.theme-toggle-btn:hover {
    transform: translateY(-2px) scale(1.08);
    background: rgba(255, 255, 255, 0.14);
    border-color: rgba(255, 255, 255, 0.3);
    border-top-color: rgba(255, 255, 255, 0.65);
    box-shadow: 0 10px 28px -4px rgba(0, 0, 0, 0.35),
        0 0 24px rgba(245, 158, 11, 0.28),
        inset 0 1px 1.5px rgba(255, 255, 255, 0.45);
    color: #f59e0b;
}

.theme-toggle-btn:hover::before {
    opacity: 1;
    transform: scale(1.2);
    background: radial-gradient(circle, rgba(245, 158, 11, 0.45) 0%, rgba(251, 191, 36, 0.18) 50%, transparent 70%);
}

[data-theme="light"] .theme-toggle-btn:hover {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.95) 0%, rgba(238, 242, 255, 0.92) 100%);
    border-color: rgba(99, 102, 241, 0.35);
    border-top-color: #ffffff;
    box-shadow: 0 10px 26px -4px rgba(99, 102, 241, 0.25),
        0 0 24px rgba(99, 102, 241, 0.32),
        inset 0 1px 1.5px rgba(255, 255, 255, 0.95);
    color: #4f46e5;
}

[data-theme="light"] .theme-toggle-btn:hover::before {
    background: radial-gradient(circle, rgba(99, 102, 241, 0.7) 0%, rgba(129, 140, 248, 0.4) 55%, transparent 70%);
    opacity: 1;
    transform: scale(1.22);
}

.theme-toggle-btn:active {
    transform: translateY(0px) scale(0.92);
    transition-duration: 0.12s;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15),
        inset 0 1px 1px rgba(0, 0, 0, 0.1);
}

.theme-toggle-btn:active::before {
    transform: scale(0.95);
    opacity: 0.6;
}

/* Celestial Dial Stage (Circular horizon aperture) */
.theme-dial-stage {
    position: absolute;
    inset: 0;
    border-radius: 50%;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none;
}

/* Icon Aesthetics & Celestial Dial Orbital Movement */
.theme-icon {
    position: absolute;
    width: 20px;
    height: 20px;
    pointer-events: none;
    transform-origin: 50% 140%;
    transition: transform 0.65s cubic-bezier(0.34, 1.25, 0.64, 1),
        opacity 0.45s ease,
        color 0.4s ease,
        filter 0.45s ease;
}

/* Moon & Sun States (Dark Mode: Moon Centered at Zenith, Sun Below Horizon) */
.icon-moon {
    opacity: 1;
    transform: rotate(0deg) scale(1);
    color: var(--toggle-color);
}

.icon-sun {
    opacity: 0;
    transform: rotate(-75deg) scale(0.65);
    color: #f59e0b;
}

/* Hover in Dark Mode: Sunrise! Moon sets to bottom-right, Sun rises from bottom-left */
.theme-toggle-btn:hover .icon-moon {
    opacity: 0;
    transform: rotate(75deg) scale(0.65);
    color: #818cf8;
    filter: drop-shadow(0 0 6px rgba(99, 102, 241, 0.4));
}

.theme-toggle-btn:hover .icon-sun {
    opacity: 1;
    transform: rotate(0deg) scale(1);
    color: #f59e0b;
    filter: drop-shadow(0 0 10px rgba(245, 158, 11, 0.65));
}

/* Light Mode Celestial Dial States (High Noon -> Sunset Hover) */
[data-theme="light"] .icon-sun {
    opacity: 1;
    transform: rotate(0deg) scale(1);
    color: var(--text-secondary);
    filter: drop-shadow(0 0 6px rgba(99, 102, 241, 0.2));
}

[data-theme="light"] .icon-moon {
    opacity: 0;
    transform: rotate(-75deg) scale(0.65);
    color: #6366f1;
}

/* Hover in Light Mode: Sunset! Sun sets to bottom-right, Moon rises from bottom-left with dark mode glow */
[data-theme="light"] .theme-toggle-btn:hover .icon-sun {
    opacity: 0;
    transform: rotate(75deg) scale(0.65);
    color: #818cf8;
    filter: drop-shadow(0 0 8px rgba(99, 102, 241, 0.5));
}

[data-theme="light"] .theme-toggle-btn:hover .icon-moon {
    opacity: 1;
    transform: rotate(0deg) scale(1);
    color: #4f46e5;
    filter: drop-shadow(0 0 8px rgba(99, 102, 241, 0.6));
}

/* 3D Liquid Glass Emblem Badge & Tile */
.glass-card-wrapper {
    position: relative;
    z-index: 10;
    transform-style: preserve-3d;
    perspective: 1200px;
    will-change: transform;
    cursor: pointer;
}

/* Outward Glass Pulse Wave */
.tile-pulse-wave {
    position: absolute;
    inset: 0;
    border-radius: var(--glass-border-radius);
    pointer-events: none;
    z-index: 1;
    opacity: 0;
    transform: scale(1);
    transform-origin: center center;
    border: 1.5px solid var(--pulse-wave-border);
    border-top: 2px solid var(--pulse-wave-border-crest);
    box-shadow:
        0 0 25px var(--pulse-wave-glow),
        inset 0 0 15px var(--pulse-wave-inner);
    background: var(--pulse-wave-fill);
    will-change: transform, opacity;
    backface-visibility: hidden;
    animation: wave-outward-pulse 15s infinite ease-in-out;
    animation-delay: 15s;
}

.tile-pulse-wave::after {
    content: '';
    position: absolute;
    inset: -8px;
    border-radius: 42px;
    border: 1px solid var(--pulse-wave-border);
    opacity: 0.45;
    pointer-events: none;
}

.glass-card-ambient {
    position: relative;
    z-index: 2;
    transform-style: preserve-3d;
    display: flex;
    align-items: center;
    justify-content: center;
}

.glass-card-wrapper.pulse .glass-card-ambient {
    animation: tile-ambient-pulse 15s infinite ease-in-out;
    animation-delay: 15s;
}

.glass-card {
    position: relative;
    z-index: 2;
    width: min(90vw, 440px);
    min-height: 480px;
    padding: 56px 44px 48px;
    border-radius: var(--glass-border-radius);
    background: var(--glass-bg-flat);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    border: 1px solid var(--glass-border-flat);
    border-top: 1px solid var(--glass-border-flat);
    box-shadow: var(--glass-shadow-flat);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    transform-style: preserve-3d;
    transform: rotateY(0deg);
    transition:
        transform 0.85s cubic-bezier(0.34, 1.25, 0.64, 1),
        background 0.5s cubic-bezier(0.16, 1, 0.3, 1),
        border-color 0.5s cubic-bezier(0.16, 1, 0.3, 1),
        box-shadow 0.6s cubic-bezier(0.16, 1, 0.3, 1),
        backdrop-filter 0.5s cubic-bezier(0.16, 1, 0.3, 1),
        -webkit-backdrop-filter 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.glass-card-wrapper.pulse .glass-card {
    animation: tile-glow-pulse 15s infinite ease-in-out;
    animation-delay: 15s;
}

/* Popped-out Active Flipped State */
.glass-card-wrapper:hover .glass-card,
.glass-card-wrapper.is-active .glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(36px) saturate(190%);
    -webkit-backdrop-filter: blur(36px) saturate(190%);
    border: 1px solid var(--glass-border);
    border-top: 1.5px solid var(--glass-border-top);
    box-shadow: var(--glass-shadow);
}

.glass-card-wrapper:hover .glass-card.flip,
.glass-card-wrapper.is-active .glass-card.flip {
    transform: rotateY(180deg);
}

.glass-card-wrapper:hover .tile-pulse-wave,
.glass-card-wrapper.is-active .tile-pulse-wave {
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

/* 3D Card Faces */
.card-face {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    transform-style: preserve-3d;
}

.card-front {
    transform: rotateY(0deg);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transition: opacity 0.22s cubic-bezier(0.4, 0, 0.2, 1) 0.1s,
        visibility 0.22s cubic-bezier(0.4, 0, 0.2, 1) 0.1s;
}

.card-back {
    position: absolute;
    inset: 0;
    padding: 52px 40px 44px;
    border-radius: var(--glass-border-radius);
    transform: rotateY(180deg);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    z-index: 10;
    transition: opacity 0.15s ease 0s,
        visibility 0.15s ease 0s;
}

/* Flip Face Swapping: When hovering or active, front cleanly vanishes, back appears immediately */
.glass-card-wrapper:hover .glass-card.flip .card-front,
.glass-card-wrapper.is-active .glass-card.flip .card-front {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.18s cubic-bezier(0.4, 0, 0.2, 1) 0s,
        visibility 0.18s cubic-bezier(0.4, 0, 0.2, 1) 0s;
}

.glass-card-wrapper:hover .glass-card.flip .card-back,
.glass-card-wrapper.is-active .glass-card.flip .card-back {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    z-index: 10;
    backface-visibility: visible;
    -webkit-backface-visibility: visible;
    transition: opacity 0.12s ease 0.11s,
        visibility 0.12s ease 0.11s;
}

/* Back Face UI Components */
.back-badge-container {
    position: relative;
    margin-bottom: 20px;
    transform: translateZ(0px);
    transition: transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
    transform-style: preserve-3d;
}

.glass-card-wrapper:hover .back-badge-container,
.glass-card-wrapper.is-active .back-badge-container {
    transform: translateZ(28px);
}

.back-halo {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 120px;
    height: 120px;
    transform: translate(-50%, -50%);
    background: radial-gradient(circle, var(--badge-accent) 0%, rgba(99, 102, 241, 0) 70%);
    opacity: 0.35;
    filter: blur(22px);
    z-index: 0;
}

.back-security-pill {
    position: relative;
    z-index: 2;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 16px;
    border-radius: 999px;
    background: rgba(99, 102, 241, 0.12);
    border: 1px solid rgba(129, 140, 248, 0.3);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    color: #a5b4fc;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.15);
}

[data-theme="light"] .back-security-pill {
    background: rgba(79, 70, 229, 0.08);
    border-color: rgba(79, 70, 229, 0.25);
    color: #4f46e5;
    box-shadow: 0 4px 15px rgba(79, 70, 229, 0.1);
}

.lock-icon {
    width: 14px;
    height: 14px;
    stroke-width: 2.2;
}

.back-title {
    font-size: clamp(1.35rem, 4vw, 1.7rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.25;
    margin-bottom: 12px;
    padding: 0 8px;
    background: var(--brand-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-transform: uppercase;
    position: relative;
    z-index: 2;
    transform: translateZ(0px);
    transition: transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1), filter 0.6s ease;
}

.glass-card-wrapper:hover .back-title,
.glass-card-wrapper.is-active .back-title {
    transform: translateZ(22px);
    filter: drop-shadow(var(--brand-glow));
}

.back-subtitle {
    font-family: var(--font-mono);
    font-size: 0.76rem;
    font-weight: 500;
    letter-spacing: 0.04em;
    line-height: 1.5;
    color: var(--text-secondary);
    margin-bottom: 22px;
    max-width: 330px;
    position: relative;
    z-index: 2;
    transform: translateZ(0px);
    transition: transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.glass-card-wrapper:hover .back-subtitle,
.glass-card-wrapper.is-active .back-subtitle {
    transform: translateZ(14px);
}

.back-divider {
    width: 50px;
    margin-bottom: 22px;
}

/* Enter Button (Hyperlink to sso.b10s.de) */
.enter-btn {
    position: relative;
    z-index: 20;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 13px 32px;
    border-radius: 16px;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.28) 0%, rgba(129, 140, 248, 0.16) 100%);
    border: 1.5px solid rgba(129, 140, 248, 0.45);
    border-top: 1.5px solid rgba(255, 255, 255, 0.65);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.88rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-decoration: none;
    text-transform: uppercase;
    cursor: pointer;
    pointer-events: auto;
    box-shadow: 0 8px 24px -4px rgba(99, 102, 241, 0.35), 0 0 0 1px rgba(255, 255, 255, 0.06);
    transform: translateY(0);
    transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1), background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease, color 0.3s ease;
    overflow: hidden;
    margin-bottom: 22px;
    backface-visibility: visible;
    -webkit-backface-visibility: visible;
}

.glass-card-wrapper:hover .enter-btn,
.glass-card-wrapper.is-active .enter-btn {
    transform: translateY(0);
}

.enter-btn:hover,
.glass-card-wrapper:hover .enter-btn:hover,
.glass-card-wrapper.is-active .enter-btn:hover {
    transform: translateY(-3px) scale(1.04);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.45) 0%, rgba(129, 140, 248, 0.28) 100%);
    border-color: rgba(129, 140, 248, 0.75);
    border-top-color: #ffffff;
    box-shadow: 0 14px 34px -4px rgba(99, 102, 241, 0.6), 0 0 35px rgba(129, 140, 248, 0.45);
    color: #ffffff;
}

.enter-btn:active {
    transform: translateY(1px) scale(0.98);
}

.enter-btn-arrow {
    font-size: 1.2rem;
    line-height: 1;
    transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
    display: inline-block;
}

.enter-btn:hover .enter-btn-arrow {
    transform: translateX(4px);
}

[data-theme="light"] .enter-btn {
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.12) 0%, rgba(99, 102, 241, 0.06) 100%);
    border: 1.5px solid rgba(79, 70, 229, 0.3);
    border-top: 1.5px solid rgba(255, 255, 255, 0.95);
    box-shadow: 0 8px 24px -4px rgba(79, 70, 229, 0.16);
    color: var(--text-primary);
}

[data-theme="light"] .enter-btn:hover {
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.2) 0%, rgba(99, 102, 241, 0.14) 100%);
    border-color: rgba(79, 70, 229, 0.55);
    box-shadow: 0 12px 32px -4px rgba(79, 70, 229, 0.28);
}

[data-theme="light"] .enter-btn:hover,
[data-theme="light"] .glass-card-wrapper:hover .enter-btn:hover,
[data-theme="light"] .glass-card-wrapper.is-active .enter-btn:hover {
    color: var(--text-primary);
}

.back-tag {
    transform: translateZ(0px);
    transition: transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.glass-card-wrapper:hover .back-tag,
.glass-card-wrapper.is-active .back-tag {
    transform: translateZ(12px);
    color: var(--text-secondary);
}

/* Ambient Recoil Scale Pulse on Ambient Wrapper (Fires every 15s, separate from card flip) */
@keyframes tile-ambient-pulse {
    0% {
        transform: scale(1);
    }

    10% {
        /* Reaches maximum height & charge (at ~1.5s) */
        transform: scale(1.035);
    }

    11.5% {
        /* Sharp snap-back recoil */
        transform: scale(0.985);
    }

    13.5% {
        /* Elastic settle */
        transform: scale(1.006);
    }

    15%,
    100% {
        /* Resting baseline until next 15s cycle */
        transform: scale(1);
    }
}

/* Glass Card Border & Glow Pulse in Sync with Wave (Fires every 15s, no transform so flip is 100% free) */
@keyframes tile-glow-pulse {
    0% {
        box-shadow: var(--glass-shadow-flat);
        border-color: var(--glass-border-flat);
        border-top-color: var(--glass-border-flat);
    }

    10% {
        /* Reaches maximum charge (at ~1.5s) */
        box-shadow: var(--pulse-shadow);
        border-color: var(--pulse-border);
        border-top-color: var(--pulse-border-top);
    }

    11.5% {
        /* Sharp snap-back recoil */
        box-shadow: var(--glass-shadow-flat);
        border-color: var(--glass-border-flat);
        border-top-color: var(--glass-border-flat);
    }

    13.5% {
        /* Elastic settle */
        box-shadow: var(--glass-shadow-flat);
        border-color: var(--glass-border-flat);
        border-top-color: var(--glass-border-flat);
    }

    15%,
    100% {
        /* Resting baseline until next 15s cycle */
        box-shadow: var(--glass-shadow-flat);
        border-color: var(--glass-border-flat);
        border-top-color: var(--glass-border-flat);
    }
}

/* Outward Pulse Wave Released at the Snap-Back (Fires every 15s) */
@keyframes wave-outward-pulse {

    0%,
    11% {
        opacity: 0;
        transform: scale(1);
        visibility: hidden;
    }

    11.5% {
        /* Released at snap-back impact */
        visibility: visible;
        opacity: 0;
        transform: scale(1);
    }

    11.8% {
        /* Starts slow: gentle initial emergence */
        opacity: 0.85;
    }

    13% {
        /* Building speed and momentum */
        opacity: 0.50;
    }

    15% {
        /* Accelerating fast outward: reaches 10% opacity at ~30% of the way */
        opacity: 0.10;
    }

    18% {
        /* High-speed expansion across the screen */
        opacity: 0.04;
    }

    22% {
        /* Dribbles out gently at the very end */
        opacity: 0.01;
        transform: scale(3.60);
    }

    24% {
        opacity: 0;
        transform: scale(3.75);
        visibility: hidden;
    }

    25%,
    100% {
        opacity: 0;
        transform: scale(1);
        visibility: hidden;
    }
}

/* Specular Reflection & Glare on Card */
.glass-glare {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: var(--glass-border-radius);
    pointer-events: none;
    background: radial-gradient(circle at 50% 0%, rgba(255, 255, 255, 0.18), transparent 70%);
    mix-blend-mode: overlay;
    opacity: 0;
    transition: opacity 0.5s ease;
}

[data-theme="light"] .glass-glare {
    background: radial-gradient(circle at 50% 0%, rgba(255, 255, 255, 0.7), transparent 60%);
}

.glass-card-wrapper:hover .glass-glare,
.glass-card-wrapper.is-active .glass-glare {
    opacity: 1;
}

/* Interactive Specular Mouse Highlight */
.mouse-specular {
    position: absolute;
    width: 320px;
    height: 320px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.18) 0%, transparent 60%);
    pointer-events: none;
    transform: translate(-50%, -50%);
    opacity: 0;
    transition: opacity 0.4s ease;
    mix-blend-mode: overlay;
    z-index: 3;
}

.glass-card-wrapper:hover .mouse-specular,
.glass-card-wrapper.is-active .mouse-specular {
    opacity: 1;
}

/* Logo Visual Icon / Monogram */
.logo-badge-container {
    position: relative;
    margin-bottom: 28px;
    transform: translateZ(0px);
    transition: transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
    transform-style: preserve-3d;
}

/* Logo Container inside top bar */
.top-bar .logo-badge-container {
    margin: 0;
}

.glass-card-wrapper.is-active .logo-badge-container {
    transform: translateZ(28px);
}

.logo-halo {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 140px;
    height: 140px;
    transform: translate(-50%, -50%);
    background: radial-gradient(circle, var(--badge-accent) 0%, rgba(99, 102, 241, 0) 70%);
    opacity: 0.12;
    filter: blur(25px);
    z-index: 0;
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.glass-card-wrapper.pulse .logo-halo {
    animation: halo-ambient-pulse 15s infinite ease-in-out;
    animation-delay: 15s;
}

@keyframes halo-ambient-pulse {
    0% {
        opacity: 0.12;
        transform: translate(-50%, -50%) scale(0.92);
    }

    10% {
        /* Blooms with charging tile (at ~1.5s) */
        opacity: 0.42;
        transform: translate(-50%, -50%) scale(1.18);
    }

    11.5% {
        /* Snaps back with tile recoil */
        opacity: 0.12;
        transform: translate(-50%, -50%) scale(0.90);
    }

    13.5% {
        opacity: 0.16;
        transform: translate(-50%, -50%) scale(0.95);
    }

    15%,
    100% {
        opacity: 0.12;
        transform: translate(-50%, -50%) scale(0.92);
    }
}

.glass-card-wrapper:hover .logo-halo,
.glass-card-wrapper.is-active .logo-halo {
    opacity: 0.45;
}

.logo-emblem-svg {
    position: relative;
    z-index: 2;
    width: 96px;
    height: 96px;
    filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.15));
    transition: transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1), filter 0.5s ease;
}

.glass-card-wrapper.is-active .logo-emblem-svg {
    transform: scale(1.06) rotate(1deg);
    filter: drop-shadow(0 14px 28px rgba(0, 0, 0, 0.35));
}

/* Logo inside top bar */
.top-bar .logo-emblem-svg {
    width: 56px;
    height: 56px;
}

/* Main Typography */
.logo-title {
    font-size: clamp(3.2rem, 8vw, 4.2rem);
    font-weight: 800;
    letter-spacing: -0.04em;
    line-height: 1;
    margin-bottom: 8px;
    padding: 0 5px;
    background: var(--brand-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 0 10px rgba(129, 140, 248, 0.08));
    position: relative;
    z-index: 2;
    display: inline-block;
    transform: translateZ(0px);
    transition: transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1), filter 0.6s ease;
}

.glass-card-wrapper.is-active .logo-title {
    transform: translateZ(20px);
    filter: drop-shadow(var(--brand-glow));
}

.logo-subtitle {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    font-weight: 600;
    letter-spacing: 0.28em;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-top: 6px;
    margin-bottom: 24px;
    position: relative;
    z-index: 2;
    transform: translateZ(0px);
    transition: transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.glass-card-wrapper.is-active .logo-subtitle {
    transform: translateZ(14px);
}

.glass-divider {
    width: 60px;
    height: 1.5px;
    background: linear-gradient(90deg, transparent, var(--glass-border-top), transparent);
    margin-bottom: 20px;
    transform: translateZ(0px);
    opacity: 0.4;
    transition: transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.5s ease;
}

.glass-card-wrapper.is-active .glass-divider {
    transform: translateZ(10px);
    opacity: 1;
}

.gateway-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.12em;
    color: var(--text-muted);
    padding: 6px 14px;
    border-radius: 99px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.06);
    transform: translateZ(0px);
    transition: transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1), color 0.4s ease, background 0.4s ease;
}

.glass-card-wrapper.is-active .gateway-tag {
    transform: translateZ(12px);
    color: var(--text-secondary);
}

[data-theme="light"] .gateway-tag {
    background: rgba(0, 0, 0, 0.03);
    border: 1px solid rgba(0, 0, 0, 0.06);
}

/* Footer Meta */
.system-footer {
    position: fixed;
    bottom: 24px;
    left: 20px;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.14em;
    color: var(--text-muted);
    text-transform: uppercase;
    z-index: 20;
}

@media (max-width: 480px) {
    .glass-card {
        padding: 44px 28px 36px;
        min-height: 440px;
    }

    .glass-glare,
    .glass-card {
        border-radius: var(--glass-border-radius-small);
    }

    .card-back {
        padding: 38px 22px 30px;
        border-radius: var(--glass-border-radius-small);
    }

    .back-title {
        font-size: 1.25rem;
    }

    .back-subtitle {
        font-size: 0.72rem;
        margin-bottom: 16px;
    }

    .enter-btn {
        padding: 11px 24px;
        font-size: 0.8rem;
        margin-bottom: 16px;
    }

    .tile-pulse-wave {
        border-radius: var(--glass-border-radius-small);
    }

    .tile-pulse-wave::after {
        border-radius: 34px;
    }

    .logo-title {
        font-size: 3rem;
    }
}