/* ═══════════════════════════════════════════════════════════
   IhreTelefonzentrale — V9 Kinetic Brutalism UI
   Aesthetic Identity: Pilot Cockpit Density, Hyper-Glassmorphism, Asymmetric Grids
   ═══════════════════════════════════════════════════════════ */

/* ── Reset & Fundamentals ─────────────────────────────────── */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    /* Ban symmetry and radii where possible */
    border-radius: 0 !important;
}

:root {
    /* Precise V9 Luxury Concierge Palette */
    --regal-navy:       #031124;  /* Deep, almost black luxury navy */
    --golden-orange:    #d4af37; /* Refined metallic gold */
    --magenta-bloom:    #82203d; /* Deeper, muted velvet red/magenta */
    --light-green:      #86b876; /* Sophisticated muted green */
    --blue-bell:        #3b6d8c; /* Steel blue */
    --ghost-white:      #fdfbf7; /* Warm off-white */
    --white:            #ffffff;
    
    /* System variables derived from palette */
    --bg:               #020813; /* Infinite void */
    --surface:          rgba(255, 255, 255, 0.02);
    --surface-hover:    rgba(255, 255, 255, 0.04);
    --surface-active:   rgba(212, 175, 55, 0.05); /* Gold tint for active */
    
    --border:           rgba(255, 255, 255, 0.06);
    --border-soft:      rgba(255, 255, 255, 0.03);
    --border-active:    var(--golden-orange);
    
    --text:             var(--ghost-white);
    --text-muted:       rgba(253, 251, 247, 0.4);
    
    /* Typography */
    --font-display:     'Outfit', sans-serif;
    --font-serif:       'Playfair Display', serif;
    --font-mono:        'Menlo', 'Consolas', monospace;

    /* Motion - Premium Spring Physics via CSS */
    --spring:           cubic-bezier(0.16, 1, 0.3, 1);
    --transition:       0.4s var(--spring);
    --transition-fast:  0.2s var(--spring);
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
    background-color: var(--bg);
}

body {
    font-family: var(--font-display);
    color: var(--text);
    min-height: 100dvh;
    padding-bottom: 8vh;
    overflow-x: hidden;
    position: relative;
}

/* ── Continuous Abstract SVGs (High-End Concierge) ─────────── */
.ambient-geometry {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    overflow: hidden;
    background: radial-gradient(circle at 15% 50%, rgba(3, 17, 36, 0.8), transparent 70%),
                radial-gradient(circle at 85% 30%, rgba(59, 109, 140, 0.1), transparent 50%);
}

.geom-ring {
    position: absolute;
    border: 1px solid rgba(255, 255, 255, 0.02); /* Very subtle smooth ring */
    border-radius: 50% !important; 
    animation: orbitalSpin infinite linear;
}

.ring-1 {
    width: 140vw; height: 140vw;
    top: -50vw; left: -20vw;
    animation-duration: 200s;
}

.ring-2 {
    width: 60vw; height: 60vw;
    bottom: -10vw; right: -10vw;
    border: 1px solid rgba(212, 175, 55, 0.03); /* Subtle gold ring */
    animation-duration: 150s;
    animation-direction: reverse;
}

.geom-crosshair { display: none; } /* Removed techie crosshairs */

@keyframes orbitalSpin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Base Body Elements */
body > * { position: relative; z-index: 10; }

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 4vw;
}

/* ── Typographic Rupture ──────────────────────────────────── */
h1, h2, h3, h4, h5, h6 {
    font-weight: 800;
    letter-spacing: -0.05em;
    line-height: 0.9;
    color: var(--white);
    margin: 0;
    text-transform: uppercase;
}

.serif-highlight {
    font-family: var(--font-serif);
    font-weight: 500;
    font-style: italic;
    color: var(--golden-orange);
    letter-spacing: -0.02em;
    text-transform: lowercase; /* Contrast the rest of the caps */
}

.tabular-data,
.price-value,
.term-months,
.step-number {
    font-family: var(--font-mono);
    letter-spacing: 0.1em;
    font-variant-numeric: tabular-nums;
}

/* ── The Luxury Glass Matrix (.glass-panel) ──────────────────────── */
.glass-panel,
.product-line-card,
.package-card,
.term-card {
    background: var(--surface);
    backdrop-filter: blur(40px);
    -webkit-backdrop-filter: blur(40px);
    border-top: 1px solid rgba(255, 255, 255, 0.12); /* Subtle refraction */
    border-left: 1px solid rgba(255, 255, 255, 0.06);
    border-right: 1px solid rgba(0, 0, 0, 0.2);
    border-bottom: 1px solid rgba(0, 0, 0, 0.4);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05),
                0 30px 60px rgba(0, 0, 0, 0.4); /* Volumetric, diffused drop */
    transition: transform var(--transition), border-color var(--transition), background var(--transition), box-shadow var(--transition);
    position: relative;
    overflow: hidden;
    /* Removed heavy brutal radius ban for subtle elegance */
    border-radius: 4px !important; 
}

.product-line-card,
.package-card:not(.quote-only),
.term-card {
    cursor: pointer;
}

/* Subtle data-nodes (replacing mechanical brackets) */
.glass-panel::before,
.product-line-card::before,
.package-card::before,
.term-card::before {
    content: '';
    position: absolute;
    width: 4px; height: 4px;
    border-radius: 50% !important;
    background: var(--border-soft);
    top: 12px; left: 12px;
    transition: background var(--transition);
}

.glass-panel:hover,
.product-line-card:hover,
.package-card:not(.quote-only):hover,
.term-card:hover {
    background: var(--surface-hover);
    border-top-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-4px); /* Magnetic lift */
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.1),
                0 40px 80px rgba(0, 0, 0, 0.6);
}

.glass-panel:hover::before,
.product-line-card:hover::before,
.package-card:not(.quote-only):hover::before,
.term-card:hover::before {
    background: var(--golden-orange); /* Wake up the panel */
    box-shadow: 0 0 10px var(--golden-orange);
}

.glass-panel.selected,
.product-line-card.selected,
.package-card.selected,
.term-card.selected {
    background: var(--surface-active);
    border-top-color: var(--golden-orange);
    border-left-color: rgba(212, 175, 55, 0.3);
    box-shadow: inset 0 1px 0 rgba(212, 175, 55, 0.2),
                0 30px 70px rgba(0, 0, 0, 0.5),
                0 0 0 1px rgba(212, 175, 55, 0.1);
}

.glass-panel.selected::before,
.product-line-card.selected::before,
.package-card.selected::before,
.term-card.selected::before {
    background: var(--light-green); /* Positive confirmation */
    box-shadow: 0 0 12px var(--light-green);
}

/* ── Header ───────────────────────────────────────────────── */
.site-header {
    background: var(--regal-navy);
    border-bottom: 2px solid var(--border);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

.site-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-logo-link {
    display: block;
}

.header-logo {
    height: 32px;
    display: block;
    /* Removed filter to keep original logo colors/visibility */
}

.header-badge {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--golden-orange);
    border: 1px solid var(--golden-orange);
    padding: 0.5rem 1rem;
    background: rgba(240, 162, 2, 0.1);
}

/* ── Hero ─────────────────────────────────────────────────── */
.hero {
    padding: 8vh 0 6vh;
    max-width: 800px;
}

.hero h1 {
    font-size: clamp(3rem, 6vw, 5rem);
    margin-bottom: 2rem;
}

.hero-sub {
    font-size: 1.125rem;
    font-weight: 300;
    max-width: 45ch;
    color: var(--text-muted);
    line-height: 1.6;
    border-left: 2px solid var(--magenta-bloom);
    padding-left: 1.5rem;
}

/* ── Steps ────────────────────────────────────────────────── */
.step {
    padding: 6vh 0;
    position: relative;
}

/* Separator lines */
.step::before {
    content: '';
    position: absolute;
    top: 0; left: -10vw; right: -10vw;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-soft) 20%, var(--border-soft) 80%, transparent);
}

.step-header {
    display: flex;
    align-items: flex-end; /* Align brutalist text base */
    gap: 1.5rem;
    margin-bottom: 3rem;
    border-bottom: 1px solid var(--blue-bell);
    padding-bottom: 1rem;
}

.step-number {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--bg);
    background: var(--blue-bell);
    padding: 0.2rem 0.5rem;
    line-height: 1;
}

.step-header h2 {
    font-size: clamp(1.5rem, 3vw, 2.5rem);
    color: var(--white);
    transform: translateY(4px); /* Optical alignment with block number */
}

/* ── Grids (Pilot Cockpit Density) ────────────────────────── */
.product-lines-grid,
.packages-grid,
.terms-grid {
    display: grid;
    gap: 1rem; /* Extremely tight brutalist gaps */
}

.product-lines-grid {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.packages-grid {
    /* Asymmetrical offsets */
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.terms-grid {
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

/* ── Product Line Cards ───────────────────────────────────── */
.product-line-card {
    padding: 2.5rem 2rem;
    text-align: left;
    display: flex;
    flex-direction: column;
}

.product-line-icon {
    width: 48px; height: 48px;
    background: var(--regal-navy);
    border: 1px solid var(--magenta-bloom);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    color: var(--magenta-bloom);
}

.product-line-icon svg { width: 24px; height: 24px; stroke-width: 1.5; }

.product-line-name {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--white);
}

.product-line-desc {
    font-size: 0.875rem;
    font-weight: 300;
    color: var(--text-muted);
}

/* ── Package Cards ────────────────────────────────────────── */
.package-card {
    padding: 2.5rem 2rem;
    display: flex;
    flex-direction: column;
}

.package-quote-badge {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    background: var(--border-soft);
    border: 1px solid var(--white);
    color: var(--white);
    padding: 0.2rem 0.6rem;
    display: inline-block;
    margin-bottom: 1.5rem;
    align-self: flex-start;
}

.package-name {
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
}

.package-tagline {
    font-size: 0.85rem;
    font-weight: 300;
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.package-price {
    font-size: 2.5rem;
    color: var(--golden-orange);
    line-height: 0.9;
    margin-bottom: 0.5rem;
}

.package-price-unit {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-muted);
    letter-spacing: 0.1em;
}

.package-setup {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--blue-bell);
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px dashed var(--border-soft);
}

.package-features {
    list-style: none;
    margin-top: auto;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.package-features li {
    font-size: 0.85rem;
    font-weight: 300;
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
}

.package-features li::before {
    content: '+';
    font-family: var(--font-mono);
    color: var(--light-green);
    font-weight: bold;
}


/* ── Term Cards ───────────────────────────────────────────── */
.term-card {
    padding: 2rem 1.5rem;
    text-align: center;
}

.term-months {
    font-size: 3rem;
    color: var(--white);
    margin-bottom: 0.5rem;
}

.term-label {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--magenta-bloom);
    margin-bottom: 1.5rem;
}

.term-price {
    font-size: 1.25rem;
    color: var(--golden-orange);
}

.term-badge {
    margin-top: 1rem;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    background: var(--light-green);
    color: var(--bg);
    padding: 0.2rem 0.5rem;
    display: inline-block;
}

/* ── Addons ───────────────────────────────────────────────── */
.addons-section h3 {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--blue-bell);
    border-bottom: 1px solid var(--border-soft);
    padding-bottom: 0.5rem;
    margin: 2rem 0 1rem;
}

.addons-list {
    display: grid;
    gap: 0.5rem; /* Ultra dense */
}

.addon-item {
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    padding: 1rem 1.5rem;
    gap: 1rem;
}

.addon-name {
    font-size: 1rem;
    font-weight: 700;
    color: var(--white);
}

.addon-desc {
    font-size: 0.8rem;
    font-weight: 300;
    color: var(--text-muted);
}

.addon-right {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.addon-price {
    font-size: 1rem;
    color: var(--golden-orange);
}

/* Toggle Switch Brutalist Override */
.addon-toggle {
    width: 44px; height: 20px;
    background: var(--surface);
    border: 1px solid var(--border);
    position: relative;
    cursor: pointer;
    overflow: hidden;
}

.addon-toggle::before {
    content: '';
    position: absolute;
    inset: 0;
    pointer-events: none;
    background: repeating-linear-gradient(45deg, transparent, transparent 4px, rgba(255,255,255,0.05) 4px, rgba(255,255,255,0.05) 8px);
}

.addon-toggle::after {
    content: '';
    position: absolute;
    top: -2px; left: -2px;
    width: 22px; height: 22px;
    background: var(--text-muted);
    border: 2px solid var(--bg);
    box-shadow: 2px 2px 0 rgba(0,0,0,0.5);
    transition: transform 0.1s steps(2, end), background-color 0.1s;
}

.addon-item.selected .addon-toggle {
    background: rgba(171, 225, 136, 0.2); /* light-green tint */
    border-color: var(--light-green);
}

.addon-item.selected .addon-toggle::after {
    background: var(--light-green);
    border-color: var(--bg);
    transform: translateX(24px);
}

/* Addon quantities */
.addon-quantity {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    border: 2px solid var(--border);
    padding: 0.2rem;
    background: var(--surface);
    box-shadow: inset 0 2px 5px rgba(0,0,0,0.5);
}

.addon-quantity button {
    width: 28px; height: 28px;
    background: var(--regal-navy);
    color: var(--white);
    border: 1px solid var(--border-soft);
    font-family: var(--font-mono);
    font-weight: bold;
    cursor: pointer;
    box-shadow: 2px 2px 0 rgba(0,0,0,0.6);
    transition: transform 0.1s steps(2, end), background 0.1s;
}

.addon-quantity button:hover {
    background: var(--magenta-bloom);
    color: var(--white);
    transform: translate(-1px, -1px);
    box-shadow: 3px 3px 0 rgba(0,0,0,0.8);
}

.addon-quantity button:active {
    transform: translate(2px, 2px);
    box-shadow: 0 0 0 transparent;
}

.addon-quantity span {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    min-width: 2ch;
    text-align: center;
    color: var(--light-green);
    font-weight: 700;
}

/* Quote-Only Addon styling (.addon-quote-btn) */
.addon-quote-btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background: transparent;
    color: var(--magenta-bloom);
    border: 2px solid var(--magenta-bloom);
    text-decoration: none;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 800;
    text-transform: uppercase;
    box-shadow: 4px 4px 0 rgba(0,0,0,0.5);
    transition: all 0.15s steps(3, end);
    white-space: nowrap;
}

.addon-quote-btn:hover {
    background: var(--magenta-bloom);
    color: var(--white);
    transform: translate(-2px, -2px);
    box-shadow: 6px 6px 0 rgba(0,0,0,0.7);
}

.addon-quote-btn:active {
    transform: translate(4px, 4px);
    box-shadow: 0 0 0 transparent;
}

.addon-quantity span {
    font-family: var(--font-mono);
    min-width: 2rem;
    text-align: center;
}

/* ── Summary ──────────────────────────────────────────────── */
.summary-card {
    padding: 3rem;
}

.summary-grid {
    display: grid;
    grid-template-columns: 1fr 340px;
    gap: 3rem;
    margin-bottom: 3rem;
}

.summary-details {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 2;
}

.summary-details strong { color: var(--white); }

.summary-line {
    display: flex;
    justify-content: space-between;
    border-bottom: 1px dashed var(--border-soft);
    padding: 0.25rem 0;
}

.summary-line-value { color: var(--white); font-weight: 700; }

.summary-pricing {
    background: rgba(0,0,0,0.3);
    border: 1px solid var(--border-soft);
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.price-block {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
}

.price-block .price-label {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--blue-bell);
    text-transform: uppercase;
}

.price-block .price-value {
    font-size: 1.5rem;
    color: var(--white);
}

.price-block.total {
    border-top: 2px solid var(--golden-orange);
    padding-top: 1.5rem;
}

.price-block.total .price-label { color: var(--golden-orange); font-size: 0.85rem; }
.price-block.total .price-value { font-size: 2.5rem; color: var(--golden-orange); }

/* ── Buttons (Luxury Concierge Cockpit) ───────────────────────── */
.btn-checkout {
    width: 100%;
    padding: 1.5rem;
    background: var(--golden-orange);
    color: var(--bg);
    border: none;
    border-radius: 4px !important;
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    cursor: pointer;
    box-shadow: 0 10px 25px rgba(212, 175, 55, 0.2), inset 0 1px 1px rgba(255,255,255,0.4);
    transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    position: relative;
    overflow: hidden;
}

/* Subtle sheen instead of brutalist stripes */
.btn-checkout::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(120deg, transparent, rgba(255,255,255,0.2), transparent);
    background-size: 200% 100%;
    transform: translateX(-100%);
    transition: transform 0.6s ease;
}

.btn-checkout > * { position: relative; z-index: 2; }

.btn-checkout:hover:not(:disabled) {
    background: #e6c245; /* Brighter gold */
    transform: translateY(-2px);
    box-shadow: 0 15px 35px rgba(212, 175, 55, 0.3), inset 0 1px 1px rgba(255,255,255,0.6);
}

.btn-checkout:hover:not(:disabled)::before {
    transform: translateX(100%);
}

.btn-checkout:active:not(:disabled) {
    transform: translateY(1px) scale(0.98); /* Physical push */
    box-shadow: 0 5px 15px rgba(212, 175, 55, 0.2), inset 0 2px 4px rgba(0,0,0,0.1);
}

.btn-checkout:disabled {
    background: rgba(255,255,255,0.05);
    color: rgba(255,255,255,0.2);
    cursor: not-allowed;
    box-shadow: none;
    border: 1px solid rgba(255,255,255,0.05);
}

.btn-checkout:disabled::before { display: none; }

/* ── Pure CSS Stagger Animations (No GSAP) ───────────────────────── */
.stagger-container {
    /* Optional wrapper rules */
}

.stagger-item {
    opacity: 0;
    transform: translateY(20px) scale(0.98);
    transition: opacity 0.6s var(--spring), transform 0.6s var(--spring);
    will-change: transform, opacity;
}

.stagger-item.stagger-enter {
    opacity: 1;
    transform: translateY(0) scale(1);
    /* Set dynamic delay via JS: `style.transitionDelay = (index * 50) + 'ms'` */
}

/* Page load initial reveal */
@keyframes pageLoadReveal {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

.hero h1, .hero p, .step-header {
    animation: pageLoadReveal 0.8s var(--spring) forwards;
    opacity: 0;
}

.hero h1 { animation-delay: 0.1s; }
.hero p { animation-delay: 0.2s; }
.step-header { animation-delay: 0.3s; }


.btn-spinner {
    width: 20px; height: 20px;
    border: 3px solid rgba(0,0,0,0.1);
    border-top-color: currentColor;
    border-radius: 50% !important;
    animation: spin 0.6s linear infinite;
}

.checkout-hint {
    margin-top: 1rem;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    text-align: center;
    color: var(--text-muted);
}

.legal-notice {
    margin-top: 1.5rem;
    padding: 1.5rem;
    border: 1px dashed var(--border-soft);
    background: rgba(4, 20, 54, 0.4);
    text-align: left;
}

.legal-notice-list {
    margin: 0;
    padding-left: 1rem;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    line-height: 1.6;
    color: var(--text-muted);
    list-style-type: square;
}

.legal-notice-list li {
    margin-bottom: 0.5rem;
}

.legal-notice-list li:last-child {
    margin-bottom: 0;
}

.legal-notice-list li strong {
    color: var(--golden-orange);
    font-weight: bold;
}

/* ── Error Banner ─────────────────────────────────────────── */
.error-banner {
    background: var(--magenta-bloom);
    color: var(--white);
    font-family: var(--font-mono);
    padding: 1rem;
    position: fixed;
    bottom: 2rem;
    left: 2rem;
    right: 2rem;
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border: 1px solid var(--white);
    box-shadow: 8px 8px 0 rgba(0,0,0,0.5);
}

.error-close {
    background: transparent;
    border: 1px solid var(--white);
    color: var(--white);
    width: 30px; height: 30px;
    font-family: var(--font-mono);
    cursor: pointer;
}

.error-close:hover { background: var(--white); color: var(--magenta-bloom); }

/* ── Result Pages ─────────────────────────────────────────── */
.result-page {
    padding: 10vh 0;
    max-width: 600px;
    margin: 0 auto;
}

.result-icon {
    width: 80px; height: 80px;
    background: rgba(0,0,0,0.3);
    border: 2px solid var(--light-green);
    color: var(--light-green);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 2rem;
    box-shadow: inset 0 0 20px rgba(171, 225, 136, 0.2);
}

.cancel-icon { border-color: var(--magenta-bloom); color: var(--magenta-bloom); }

.result-page h1 { font-size: 3rem; margin-bottom: 1.5rem; }
.result-page p { font-size: 1.125rem; font-weight: 300; margin-bottom: 3rem; }

.btn-back {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    background: transparent;
    border: 2px solid var(--blue-bell);
    color: var(--blue-bell);
    text-decoration: none;
    font-weight: 800;
    text-transform: uppercase;
    box-shadow: 4px 4px 0 rgba(0,0,0,0.5), inset 0 0 8px rgba(0, 157, 220, 0.2);
    transition: all 0.15s steps(3, end);
}

.btn-back:hover {
    background: var(--blue-bell);
    color: var(--bg);
    transform: translate(-3px, -3px);
    box-shadow: 8px 8px 0 rgba(0,0,0,0.7);
}

.btn-back:active {
    transform: translate(4px, 4px);
    box-shadow: 0 0 0 transparent;
}

/* ── Footer ───────────────────────────────────────────────── */
.site-footer {
    padding: 2rem 0;
    border-top: 1px solid var(--border-soft);
    margin-top: 4rem;
}

.site-footer p {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-muted);
    text-align: center;
}

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 900px) {
    .summary-grid { grid-template-columns: 1fr; gap: 2rem; }
    .hero h1 { font-size: 2.5rem; }
    .glass-panel { padding: 2rem 1.5rem; }
}

@media (max-width: 600px) {
    .product-lines-grid, .packages-grid, .terms-grid { grid-template-columns: 1fr; }
    .addon-item { grid-template-columns: 1fr; gap: 1rem; }
    .addon-right { justify-content: space-between; }
    .hero { padding: 4vh 0; }
    .step-header { flex-direction: column; align-items: flex-start; gap: 0.5rem; }
}

/* ─ V9 Hardware Acceleration ─ */
.glass-panel, .geom-ring, .btn-checkout {
    will-change: transform;
}

/* ─ Header Logo ─ */
.header-logo {
    height: 60px; /* Increased scale */
    width: auto;
    transition: transform 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
    transform-origin: left center;
}

.header-logo:hover {
    transform: scale(1.05);
}