/*DESIGN TOKENS & VARIABLES*/
:root {
    /* Colors */
    --bg-primary: #020617;
    --bg-secondary: #050B18;
    --bg-card: rgba(148, 163, 184, 0.05);
    --border-glass: rgba(148, 163, 184, 0.12);
    --border-glass-strong: rgba(148, 163, 184, 0.20);
    --text-primary: #F1F5F9;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;
    --accent: #3B82F6;
    --accent-dark: #2563EB;
    --accent-light: #60A5FA;
    --accent-glow: rgba(59, 130, 246, 0.35);
    --accent-soft: rgba(59, 130, 246, 0.12);
    --success: #34D399;
    --success-glow: rgba(52, 211, 153, 0.25);
    
    /* Spacing & Radii */
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 22px;
    --radius-xl: 32px;
    --radius-full: 9999px;
    --shadow-card: 0 8px 40px -20px rgba(0, 0, 0, 0.7);
    --shadow-glow: 0 0 60px -24px var(--accent-glow);
    --ease: cubic-bezier(0.22, 1, 0.36, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --nav-height: 68px;
    --bottom-nav-height: 64px;
    --max-width: 1180px;

    /* Typography Families */
    --font-display: 'Outfit', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', 'Fira Mono', 'Cascadia Code', 'Menlo', 'Consolas', monospace;

    /* Type scale */
    --text-xs: clamp(0.625rem, 0.6rem + 0.15vw, 0.75rem);
    --text-sm: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
    --text-base: clamp(0.9375rem, 0.9rem + 0.25vw, 1.0625rem);
    --text-lg: clamp(1.125rem, 1.05rem + 0.4vw, 1.375rem);
    --text-xl: clamp(1.375rem, 1.2rem + 0.8vw, 1.75rem);
    --text-2xl: clamp(1.75rem, 1.5rem + 1.2vw, 2.5rem);
    --text-3xl: clamp(2.25rem, 1.9rem + 1.8vw, 3.5rem);
    --text-4xl: clamp(2.8rem, 2.3rem + 2.6vw, 4.5rem);

    /* Line Heights */
    --leading-none: 1;
    --leading-tight: 1.15;
    --leading-snug: 1.25;
    --leading-normal: 1.5;
    --leading-relaxed: 1.65;
    --leading-loose: 1.8;

    /* Letter Spacing */
    --tracking-tight: -0.025em;
    --tracking-normal: 0;
    --tracking-wide: 0.02em;
    --tracking-wider: 0.04em;
    --tracking-widest: 0.08em;

    /* Weights */
    --weight-light: 300;
    --weight-regular: 400;
    --weight-medium: 500;
    --weight-semibold: 600;
    --weight-bold: 700;
    --weight-extrabold: 800;
    --weight-black: 900;
}

/*RESET & BASE STYLES*/
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

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

body {
    min-height: 100vh;
    background: var(--bg-primary);
    background-image:
        radial-gradient(1000px 500px at 6% -4%, rgba(59, 130, 246, 0.14), transparent 60%),
        radial-gradient(800px 400px at 94% 10%, rgba(59, 130, 246, 0.08), transparent 50%),
        radial-gradient(400px 300px at 50% 80%, rgba(59, 130, 246, 0.04), transparent 50%);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: var(--text-base);
    font-weight: var(--weight-regular);
    line-height: var(--leading-relaxed);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    padding-bottom: calc(var(--bottom-nav-height) + 24px);
}

/* Headings & Typography Defaults */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: var(--weight-bold);
    line-height: var(--leading-tight);
    letter-spacing: var(--tracking-tight);
    color: var(--text-primary);
    margin: 0 0 0.4em;
}

h1 { font-size: var(--text-4xl); font-weight: var(--weight-extrabold); }
h2 { font-size: var(--text-3xl); font-weight: var(--weight-bold); }
h3 { font-size: var(--text-2xl); font-weight: var(--weight-semibold); }
h4 { font-size: var(--text-xl); font-weight: var(--weight-semibold); }
h5 { font-size: var(--text-lg); font-weight: var(--weight-semibold); }
h6 { font-size: var(--text-base); font-weight: var(--weight-semibold); letter-spacing: var(--tracking-wide); }

p, li, .text-body {
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: var(--leading-relaxed);
    color: var(--text-secondary);
}

small, .text-sm { font-size: var(--text-sm); line-height: var(--leading-normal); }
.text-xs { font-size: var(--text-xs); line-height: var(--leading-normal); }
.text-lg { font-size: var(--text-lg); line-height: var(--leading-relaxed); }
.text-xl { font-size: var(--text-xl); line-height: var(--leading-snug); }

code, pre, .font-mono {
    font-family: var(--font-mono);
    font-weight: var(--weight-regular);
    font-size: 0.9em;
    line-height: var(--leading-normal);
    letter-spacing: var(--tracking-normal);
}

/* Utility Classes */
.font-display { font-family: var(--font-display); }
.font-sans { font-family: var(--font-sans); }
.font-mono { font-family: var(--font-mono); }
.tracking-tight { letter-spacing: var(--tracking-tight); }
.tracking-wide { letter-spacing: var(--tracking-wide); }
.tracking-wider { letter-spacing: var(--tracking-wider); }
.leading-tight { line-height: var(--leading-tight); }
.leading-snug { line-height: var(--leading-snug); }
.leading-relaxed { line-height: var(--leading-relaxed); }

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }

:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
    border-radius: 4px;
}
::selection { background: var(--accent); color: #03060D; }

/* Skip Link */
.skip-link {
    position: absolute;
    left: 1rem;
    top: -60px;
    background: var(--accent);
    color: #02070F;
    font-weight: var(--weight-semibold);
    padding: 0.7rem 1.2rem;
    border-radius: var(--radius-sm);
    z-index: 1000;
    transition: top 0.2s var(--ease);
}
.skip-link:focus { top: 1rem; }

/* Container */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin-inline: auto;
    padding-inline: clamp(1rem, 3.6vw, 2.4rem);
}

/* Glassmorphism Utilities */
.glass {
    background: linear-gradient(160deg, rgba(148, 163, 184, 0.07), rgba(148, 163, 184, 0.02));
    border: 1px solid var(--border-glass);
    backdrop-filter: blur(20px) saturate(160%);
    -webkit-backdrop-filter: blur(20px) saturate(160%);
    box-shadow: var(--shadow-card), 0 1px 0 rgba(255, 255, 255, 0.03) inset;
}
.glass-strong {
    background: linear-gradient(160deg, rgba(148, 163, 184, 0.10), rgba(148, 163, 184, 0.03));
    border: 1px solid var(--border-glass-strong);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    box-shadow: var(--shadow-card), 0 1px 0 rgba(255, 255, 255, 0.04) inset;
}

/*NAVIGATION COMPONENTS*/
.site-nav {
    position: fixed;
    top: 14px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 100;
    width: min(calc(100% - 28px), var(--max-width));
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.4rem 0.8rem 0.4rem 1.2rem;
    background: rgba(2, 6, 23, 0.6);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-full);
    backdrop-filter: blur(28px) saturate(180%);
    -webkit-backdrop-filter: blur(28px) saturate(180%);
    box-shadow: 0 12px 48px -24px rgba(0, 0, 0, 0.9);
    transition: background 0.3s ease, box-shadow 0.3s ease;
}
.site-nav.scrolled {
    background: rgba(2, 6, 23, 0.82);
    box-shadow: 0 16px 56px -24px rgba(0, 0, 0, 0.95);
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-display);
    font-weight: var(--weight-bold);
    font-size: var(--text-base);
    letter-spacing: var(--tracking-tight);
}
.brand img {
    width: 28px;
    height: 28px;
    border-radius: 6px;
    flex-shrink: 0;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 1.8rem;
    list-style: none;
}
.nav-links a {
    color: var(--text-secondary);
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    transition: color 0.2s var(--ease);
    position: relative;
}
.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    border-radius: 2px;
    transition: width 0.3s var(--ease);
}
.nav-links a:hover { color: #fff; }
.nav-links a:hover::after { width: 100%; }

.nav-cta {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    background: var(--accent);
    color: #03060D;
    font-weight: var(--weight-semibold);
    font-size: var(--text-sm);
    padding: 0.45rem 1.1rem;
    border-radius: var(--radius-full);
    box-shadow: 0 8px 28px -10px var(--accent-glow);
    transition: transform 0.25s var(--ease-spring), box-shadow 0.25s var(--ease);
}
.nav-cta:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 12px 36px -8px var(--accent-glow);
}

.nav-toggle {
    display: none;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-sm);
    color: #fff;
    transition: border-color 0.2s ease;
    background: rgba(148, 163, 184, 0.05);
}
.nav-toggle:hover { border-color: var(--accent); }

.nav-overlay {
    position: fixed;
    inset: 0;
    z-index: 99;
    background: rgba(2, 6, 23, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.35s var(--ease);
}
.nav-overlay.open { opacity: 1; pointer-events: auto; }

.nav-mobile-menu {
    position: fixed;
    top: 80px;
    right: 16px;
    width: min(300px, 80%);
    background: rgba(2, 6, 23, 0.9);
    border: 1px solid var(--border-glass-strong);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(32px);
    -webkit-backdrop-filter: blur(32px);
    box-shadow: 0 24px 60px -30px rgba(0, 0, 0, 0.9);
    padding: 1.6rem 1.2rem;
    transform: translateY(-12px) scale(0.96);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.35s var(--ease), opacity 0.35s var(--ease);
    z-index: 100;
}
.nav-mobile-menu.open {
    transform: translateY(0) scale(1);
    opacity: 1;
    pointer-events: auto;
}
.nav-mobile-menu ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}
.nav-mobile-menu a {
    font-size: var(--text-base);
    font-weight: var(--weight-medium);
    color: var(--text-secondary);
    padding: 0.4rem 0;
    border-bottom: 1px solid var(--border-glass);
    display: block;
    transition: color 0.2s ease;
}
.nav-mobile-menu a:hover { color: #fff; }

.nav-cta-mobile {
    display: inline-flex;
    background: var(--accent);
    color: #03060D !important;
    padding: 0.45rem 1.1rem !important;
    border-radius: var(--radius-full);
    border-bottom: none !important;
}

@media (max-width: 740px) {
    .nav-links { display: none; }
    .nav-toggle { display: inline-flex; }
    .site-nav { padding: 0.4rem 0.8rem 0.4rem 1rem; }
    .nav-cta { display: none; }
}

/*HERO & CHAMBER SECTION*/
.hero {
    padding-top: calc(var(--nav-height) + 3.2rem);
    padding-bottom: 2.8rem;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    font-weight: var(--weight-medium);
    letter-spacing: var(--tracking-wider);
    text-transform: uppercase;
    color: var(--accent-light);
    background: var(--accent-soft);
    border: 1px solid rgba(59, 130, 246, 0.25);
    padding: 0.3rem 0.8rem;
    border-radius: var(--radius-full);
    margin-bottom: 1rem;
}
.eyebrow .dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--success);
    box-shadow: 0 0 0 3px rgba(52, 211, 153, 0.20);
    animation: pulse-dot 2.4s ease-in-out infinite;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(0.8); }
}

.hero-title {
    font-family: var(--font-display);
    font-weight: var(--weight-extrabold);
    font-size: var(--text-4xl);
    line-height: var(--leading-tight);
    letter-spacing: var(--tracking-tight);
    margin: 0 0 0.8rem;
    max-width: 15ch;
}
.hero-title .accent {
    background: linear-gradient(135deg, var(--accent), #93C5FD, var(--accent-light));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    background-size: 200% 200%;
    animation: grad-shift 7s ease-in-out infinite alternate;
}

@keyframes grad-shift {
    0% { background-position: 0% 50%; }
    100% { background-position: 100% 50%; }
}

.hero-sub {
    font-family: var(--font-sans);
    font-size: var(--text-lg);
    font-weight: var(--weight-regular);
    line-height: var(--leading-relaxed);
    color: var(--text-secondary);
    max-width: 50ch;
    margin: 0 0 2rem;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.05fr 0.75fr;
    gap: 1.6rem;
    align-items: start;
}

@media (max-width: 940px) {
    .hero-grid { grid-template-columns: 1fr; }
}

/* Chamber Dropzone */
.chamber {
    padding: clamp(1.2rem, 2.8vw, 2rem);
    border-radius: var(--radius-lg);
    position: relative;
    isolation: isolate;
    overflow: hidden;
}
.chamber::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    z-index: -1;
    background: linear-gradient(150deg, rgba(59, 130, 246, 0.06), transparent 50%);
    opacity: 0.9;
}

.dropzone {
    border: 1.5px dashed var(--border-glass-strong);
    border-radius: var(--radius-md);
    padding: clamp(1.6rem, 4.5vw, 2.8rem) 1.2rem;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.3s var(--ease), background 0.3s var(--ease), transform 0.3s var(--ease-spring), box-shadow 0.3s var(--ease);
}
.dropzone:hover,
.dropzone:focus-visible {
    border-color: var(--accent);
    background: rgba(59, 130, 246, 0.05);
    box-shadow: 0 0 48px -16px var(--accent-glow);
}
.dropzone.is-dragover {
    border-color: var(--accent);
    background: rgba(59, 130, 246, 0.08);
    transform: scale(1.01);
    box-shadow: 0 0 64px -20px var(--accent-glow);
}
.dropzone.is-busy {
    opacity: 0.5;
    pointer-events: none;
}

.chamber-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 0.8rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 18px;
    background: linear-gradient(145deg, rgba(59, 130, 246, 0.20), rgba(59, 130, 246, 0.04));
    border: 1px solid rgba(59, 130, 246, 0.25);
    color: var(--accent-light);
    transition: transform 0.3s var(--ease-spring), box-shadow 0.3s var(--ease);
}
.dropzone:hover .chamber-icon {
    transform: scale(1.04);
    box-shadow: 0 0 32px -10px var(--accent-glow);
}
.chamber-icon svg { width: 26px; height: 26px; }

.dropzone h2 {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: var(--weight-semibold);
    letter-spacing: var(--tracking-tight);
    margin: 0 0 0.2rem;
}
.dropzone p {
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    color: var(--text-secondary);
    margin: 0;
}
.dropzone .browse {
    color: var(--accent-light);
    font-weight: var(--weight-semibold);
    text-decoration: underline;
    text-underline-offset: 3px;
    transition: color 0.2s ease;
}
.dropzone .browse:hover { color: #fff; }

.file-meta-hint {
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    color: var(--text-muted);
    margin-top: 0.6rem;
    letter-spacing: var(--tracking-wider);
}

#file-input {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* File Chip UI */
.file-chip {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    background: rgba(148, 163, 184, 0.06);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-sm);
    padding: 0.6rem 0.8rem;
    margin-top: 0.8rem;
    animation: chip-in 0.35s var(--ease-spring);
}

@keyframes chip-in {
    from { opacity: 0; transform: translateY(6px) scale(0.96); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.file-chip svg {
    width: 18px;
    height: 18px;
    color: var(--accent-light);
    flex-shrink: 0;
}
.file-chip .fc-name {
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    flex: 1;
}
.file-chip .fc-size {
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    color: var(--text-secondary);
}
.file-chip button {
    padding: 0.2rem;
    border-radius: 4px;
    line-height: 0;
    color: var(--text-secondary);
    transition: color 0.2s ease, background 0.2s ease;
}
.file-chip button:hover {
    color: #fff;
    background: rgba(148, 163, 184, 0.10);
}

.chamber-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.7rem;
    margin-top: 1rem;
}

/* Action Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-family: var(--font-sans);
    font-weight: var(--weight-semibold);
    font-size: var(--text-sm);
    padding: 0.65rem 1.3rem;
    border-radius: var(--radius-full);
    border: 1px solid transparent;
    transition: transform 0.25s var(--ease-spring), box-shadow 0.25s var(--ease), opacity 0.2s ease, background 0.2s ease;
    letter-spacing: var(--tracking-normal);
}
.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none !important;
}

.btn-primary {
    background: linear-gradient(145deg, var(--accent), var(--accent-dark));
    color: #03060D;
    box-shadow: 0 8px 28px -10px var(--accent-glow);
}
.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 14px 38px -10px var(--accent-glow);
}

.btn-ghost {
    background: rgba(148, 163, 184, 0.06);
    color: var(--text-primary);
    border-color: var(--border-glass);
}
.btn-ghost:hover:not(:disabled) {
    background: rgba(148, 163, 184, 0.10);
    border-color: var(--border-glass-strong);
    transform: translateY(-1px);
}

.btn svg { width: 16px; height: 16px; flex-shrink: 0; }
.btn .spinner {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    border: 2px solid rgba(3, 6, 13, 0.25);
    border-top-color: #03060D;
    animation: spin 0.7s linear infinite;
}

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

/*READOUT & STATS PANEL*/
.readout {
    padding: 1.4rem 1.6rem;
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    gap: 1rem;
    min-height: 250px;
}
.readout h3 {
    font-family: var(--font-display);
    font-size: var(--text-lg);
    font-weight: var(--weight-semibold);
    letter-spacing: var(--tracking-tight);
    margin: 0;
}

.readout-empty {
    color: var(--text-secondary);
    font-size: var(--text-sm);
    flex: 1;
    display: flex;
    align-items: center;
    padding: 0.2rem 0;
    line-height: var(--leading-relaxed);
}

.gauge {
    display: none;
    flex-direction: column;
    gap: 0.9rem;
    animation: fade-up 0.5s var(--ease-spring);
}

@keyframes fade-up {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.gauge.is-active { display: flex; }

.gauge-percent {
    font-family: var(--font-display);
    font-weight: var(--weight-bold);
    font-size: clamp(2.2rem, 5vw, 3rem);
    color: var(--success);
    line-height: var(--leading-none);
    letter-spacing: var(--tracking-tight);
    display: flex;
    align-items: baseline;
    gap: 0.2rem;
}
.gauge-percent small {
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    color: var(--text-secondary);
    font-weight: var(--weight-medium);
    margin-left: 0.2rem;
}

.gauge-bar {
    position: relative;
    height: 6px;
    border-radius: var(--radius-full);
    overflow: hidden;
    background: rgba(148, 163, 184, 0.10);
}
.gauge-bar-fill {
    position: absolute;
    inset: 0 auto 0 0;
    width: 0%;
    border-radius: var(--radius-full);
    background: linear-gradient(90deg, var(--accent), var(--success));
    transition: width 1.2s var(--ease);
}

.gauge-rows {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.6rem 1rem;
    padding-top: 0.2rem;
}
.gauge-row {
    display: flex;
    flex-direction: column;
    gap: 0.05rem;
}
.gauge-row .label {
    font-family: var(--font-sans);
    font-size: var(--text-xs);
    font-weight: var(--weight-medium);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wider);
    color: var(--text-muted);
}
.gauge-row .value {
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
}
.gauge-row .value.after { color: var(--success); }

/* Status Log Panel */
.log-panel {
    padding: 1rem 1.1rem;
    margin-top: 1rem;
    border-radius: var(--radius-md);
    background: rgba(2, 6, 23, 0.40);
    border: 1px solid var(--border-glass);
}
.log-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.5rem;
}
.log-head h3 {
    font-family: var(--font-sans);
    font-size: var(--text-xs);
    font-weight: var(--weight-semibold);
    margin: 0;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    text-transform: uppercase;
    letter-spacing: var(--tracking-wider);
    color: var(--text-secondary);
}
.log-head .dot {
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--success);
}
.log-toggle {
    background: none;
    border: none;
    color: var(--text-muted);
    font-family: var(--font-sans);
    font-size: var(--text-xs);
    font-weight: var(--weight-medium);
    cursor: pointer;
    text-decoration: underline;
    text-underline-offset: 2px;
    transition: color 0.2s ease;
}
.log-toggle:hover { color: #fff; }

.log-body {
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    line-height: var(--leading-loose);
    color: #A7B4C6;
    max-height: 150px;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: rgba(148, 163, 184, 0.15) transparent;
}
.log-body::-webkit-scrollbar { width: 3px; }
.log-body::-webkit-scrollbar-track { background: transparent; }
.log-body::-webkit-scrollbar-thumb {
    background: rgba(148, 163, 184, 0.20);
    border-radius: 4px;
}
.log-body div {
    padding: 0.05rem 0;
    white-space: pre-wrap;
    word-break: break-word;
    border-bottom: 1px solid rgba(148, 163, 184, 0.03);
}
.log-body div:last-child { border-bottom: none; }
.log-body .t {
    color: #4A5A72;
    margin-right: 0.5rem;
    font-weight: var(--weight-regular);
}
.log-body .ok { color: var(--success); }

/*FEATURES & STEPS SECTIONS*/
.section { padding: 4rem 0; }
.section-head {
    max-width: 44ch;
    margin-bottom: 2.4rem;
}
.section-head .eyebrow { margin-bottom: 0.6rem; }
.section-head h2 {
    font-family: var(--font-display);
    font-weight: var(--weight-extrabold);
    font-size: var(--text-3xl);
    letter-spacing: var(--tracking-tight);
    margin: 0 0 0.4rem;
}
.section-head p {
    font-family: var(--font-sans);
    font-size: var(--text-lg);
    color: var(--text-secondary);
    margin: 0;
}

/* Feature Grid */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}
@media (max-width: 880px) { .feature-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 580px) { .feature-grid { grid-template-columns: 1fr; } }

.feature-card {
    padding: 1.4rem 1.3rem;
    border-radius: var(--radius-md);
    background: linear-gradient(160deg, rgba(148, 163, 184, 0.06), rgba(148, 163, 184, 0.02));
    border: 1px solid var(--border-glass);
    backdrop-filter: blur(12px) saturate(140%);
    -webkit-backdrop-filter: blur(12px) saturate(140%);
    transition: transform 0.3s var(--ease-spring), border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.feature-card:hover {
    transform: translateY(-3px);
    border-color: var(--border-glass-strong);
    box-shadow: 0 16px 48px -24px rgba(0, 0, 0, 0.6);
}
.feature-card .f-icon {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-soft);
    color: var(--accent-light);
    margin-bottom: 0.8rem;
    transition: transform 0.3s var(--ease-spring), background 0.3s ease;
}
.feature-card:hover .f-icon {
    transform: scale(1.05);
    background: rgba(59, 130, 246, 0.16);
}
.feature-card .f-icon svg { width: 18px; height: 18px; }
.feature-card h3 {
    font-family: var(--font-display);
    font-size: var(--text-lg);
    font-weight: var(--weight-semibold);
    letter-spacing: var(--tracking-tight);
    margin: 0 0 0.25rem;
}
.feature-card p {
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    color: var(--text-secondary);
    margin: 0;
    line-height: var(--leading-relaxed);
}

/* Steps Grid */
.steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.9rem;
}
@media (max-width: 880px) { .steps { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .steps { grid-template-columns: 1fr; } }

.step {
    padding: 1.3rem 1.2rem;
    border-radius: var(--radius-md);
    background: linear-gradient(160deg, rgba(148, 163, 184, 0.06), rgba(148, 163, 184, 0.02));
    border: 1px solid var(--border-glass);
    backdrop-filter: blur(12px) saturate(140%);
    -webkit-backdrop-filter: blur(12px) saturate(140%);
    transition: transform 0.3s var(--ease-spring), border-color 0.3s ease;
}
.step:hover {
    transform: translateY(-2px);
    border-color: var(--border-glass-strong);
}
.step .s-num {
    font-family: var(--font-mono);
    color: var(--accent-light);
    font-size: var(--text-xs);
    font-weight: var(--weight-medium);
    margin-bottom: 0.4rem;
    display: block;
    letter-spacing: var(--tracking-wider);
}
.step h3 {
    font-family: var(--font-display);
    font-size: var(--text-base);
    font-weight: var(--weight-semibold);
    letter-spacing: var(--tracking-tight);
    margin: 0 0 0.25rem;
}
.step p {
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    color: var(--text-secondary);
    margin: 0;
    line-height: var(--leading-relaxed);
}

/*FOOTER & OVERLAYS*/
footer {
    padding: 2.4rem 0 2.8rem;
    border-top: 1px solid var(--border-glass);
    margin-top: 0.4rem;
}
.footer-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.8rem;
}
.footer-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.footer-brand img { width: 22px; height: 22px; border-radius: 5px; }
.footer-brand span {
    font-family: var(--font-display);
    font-weight: var(--weight-bold);
    font-size: var(--text-base);
    letter-spacing: var(--tracking-tight);
}
footer small {
    font-family: var(--font-sans);
    font-size: var(--text-xs);
    color: var(--text-muted);
}
.footer-links {
    display: flex;
    gap: 1.2rem;
    align-items: center;
    flex-wrap: wrap;
}
.footer-tagline { color: var(--text-secondary); }
.footer-links a {
    font-family: var(--font-sans);
    font-size: var(--text-xs);
    color: var(--text-muted);
    transition: color 0.2s ease;
}
.footer-links a:hover { color: var(--text-primary); }

/* Cookie Banner */
#cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(2, 6, 23, 0.92);
    backdrop-filter: blur(24px) saturate(1.4);
    -webkit-backdrop-filter: blur(24px) saturate(1.4);
    border-top: 1px solid rgba(59, 130, 246, 0.1);
    padding: 16px 24px;
    z-index: 10000;
    transform: translateY(0);
    transition: all 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}
#cookie-banner.hidden { transform: translateY(100%); }

.cookie-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}
.cookie-text {
    display: flex;
    align-items: center;
    gap: 12px;
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    color: var(--text-secondary);
}
.cookie-text a {
    color: var(--accent-light);
    text-decoration: none;
    border-bottom: 1px dotted rgba(59, 130, 246, 0.2);
    transition: border-color 0.2s ease;
}
.cookie-text a:hover { border-bottom-color: var(--accent-light); }

.cookie-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.btn-cookie {
    padding: 8px 22px;
    border-radius: var(--radius-sm);
    border: none;
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    cursor: pointer;
    transition: all 0.2s var(--ease);
}
.btn-cookie-accept {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 2px 20px rgba(59, 130, 246, 0.25);
}
.btn-cookie-accept:hover {
    background: #5b9af8;
    transform: translateY(-2px);
    box-shadow: 0 4px 28px rgba(59, 130, 246, 0.35);
}
.btn-cookie-decline {
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-secondary);
    border: 1px solid rgba(148, 163, 184, 0.08);
}
.btn-cookie-decline:hover {
    background: rgba(255, 255, 255, 0.08);
    color: #fff;
}

/* Bottom Navigation Bar (Mobile) */
.bottom-nav {
    position: fixed;
    bottom: 16px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 90;
    width: min(calc(100% - 32px), 580px);
    background: rgba(2, 6, 23, 0.75);
    border: 1px solid var(--border-glass-strong);
    border-radius: var(--radius-xl);
    backdrop-filter: blur(28px) saturate(180%);
    -webkit-backdrop-filter: blur(28px) saturate(180%);
    box-shadow: 0 12px 48px -24px rgba(0, 0, 0, 0.9);
    display: flex;
    align-items: center;
    justify-content: space-around;
    padding: 0.4rem 0.2rem;
    height: var(--bottom-nav-height);
}
.bottom-nav a {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.1rem;
    color: var(--text-secondary);
    font-family: var(--font-sans);
    font-size: var(--text-xs);
    font-weight: var(--weight-medium);
    padding: 0.2rem 0.4rem;
    border-radius: var(--radius-sm);
    transition: color 0.2s var(--ease), transform 0.25s var(--ease-spring);
    min-width: 48px;
    text-decoration: none;
    letter-spacing: var(--tracking-wide);
}
.bottom-nav a:hover,
.bottom-nav a:focus-visible {
    color: #fff;
    transform: translateY(-2px);
}
.bottom-nav a.active { color: var(--accent-light); }
.bottom-nav a svg {
    width: 22px;
    height: 22px;
    stroke: currentColor;
    stroke-width: 1.8;
    fill: none;
    transition: stroke 0.2s;
}
.bottom-nav a span {
    line-height: 1;
    font-size: var(--text-xs);
    letter-spacing: var(--tracking-wide);
}

@media (min-width: 741px) {
    .bottom-nav { display: none; }
    body { padding-bottom: 0; }
}

/* Toast Notifications */
.toast-region {
    position: fixed;
    bottom: calc(var(--bottom-nav-height) + 28px);
    left: 50%;
    transform: translateX(-50%);
    z-index: 200;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    width: min(92%, 380px);
    pointer-events: none;
}
@media (min-width: 741px) { .toast-region { bottom: 20px; } }

.toast {
    padding: 0.7rem 0.9rem;
    border-radius: var(--radius-sm);
    background: rgba(2, 6, 23, 0.92);
    border: 1px solid var(--border-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    animation: toast-in 0.35s var(--ease-spring);
    box-shadow: 0 16px 40px -20px rgba(0, 0, 0, 0.9);
    pointer-events: auto;
}
.toast.error { border-color: rgba(248, 113, 113, 0.35); }
.toast .t-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--success);
    flex-shrink: 0;
}
.toast.error .t-dot { background: #F87171; }

@keyframes toast-in {
    from { opacity: 0; transform: translateY(10px) scale(0.96); }
    to { opacity: 1; transform: translateY(0); }
}

/* Responsive Fine-Tuning */
@media (max-width: 740px) {
    .container { padding-inline: 1rem; }
    .readout { min-height: 180px; padding: 1.2rem 1.2rem; }
    .gauge-rows { gap: 0.4rem; }
}
@media (max-width: 460px) {
    .chamber-actions .btn {
        flex: 1;
        min-width: 110px;
        font-size: var(--text-sm);
        padding: 0.55rem 0.9rem;
    }
    .feature-card { padding: 1rem 0.9rem; }
    .step { padding: 1rem 0.9rem; }
    .hero-title { font-size: var(--text-3xl); }
    .dropzone h2 { font-size: var(--text-lg); }
    .dropzone p { font-size: var(--text-sm); }
}

@media (prefers-reduced-motion: reduce) {
    .gauge-bar-fill, .dropzone, .feature-card, .step, .btn { transition: none !important; }
    .feature-card:hover, .step:hover, .btn:hover:not(:disabled) { transform: none !important; }
}