/* ═══════════════════════════════════════════════════════════
   Smart Lighting Calculator — Premium Styles
   ═══════════════════════════════════════════════════════════ */

.lighting-calculator {
    padding: var(--space-12) 0 var(--space-8);
    position: relative;
    background: radial-gradient(ellipse at 50% 0%, rgba(124, 58, 237, 0.05) 0%, transparent 70%);
}

.lighting-calculator::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--card-border), transparent);
}

.calc-ambient-glow {
    position: absolute;
    top: 20%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(124, 58, 237, 0.05) 0%, transparent 60%);
    pointer-events: none;
    z-index: 0;
}

body.light-theme .calc-ambient-glow {
    background: radial-gradient(circle, rgba(111, 107, 232, 0.06) 0%, transparent 62%);
}

.lighting-calculator .container {
    position: relative;
    z-index: 1;
}

/* Section Header */
.calc-header {
    text-align: center;
    margin-bottom: var(--space-6);
}

.calc-header h2 {
    font-size: clamp(1.6rem, 3vw, 2.2rem);
    margin-bottom: var(--space-2);
}

.calc-header p {
    color: var(--text-secondary);
    font-size: 1rem;
    max-width: 520px;
    margin: 0 auto;
    line-height: var(--leading-relaxed);
}

/* ── Progress Indicator ── */
.calc-progress {
    display: flex;
    align-items: center;
    justify-content: center;
    max-width: 600px;
    margin: 0 auto var(--space-8);
    position: relative;
}

.calc-progress-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
    position: relative;
    z-index: 2;
    opacity: 0.5;
    transition: all 0.3s var(--ease-premium);
}

.calc-progress-step.active,
.calc-progress-step.completed {
    opacity: 1;
}

.progress-dot {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-full);
    background: var(--card-bg);
    border: 2px solid var(--card-border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 700;
    font-family: var(--font-heading);
    color: var(--text-secondary);
    transition: all 0.3s var(--ease-premium);
    box-shadow: var(--shadow-sm);
}

.calc-progress-step.active .progress-dot {
    border-color: var(--primary-neon);
    color: var(--primary-neon);
    box-shadow: 0 0 15px var(--primary-neon-glow);
}

.calc-progress-step.completed .progress-dot {
    background: var(--primary-neon);
    border-color: var(--primary-neon);
    color: var(--bg-primary);
}

.progress-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: var(--tracking-wider);
    color: var(--text-secondary);
}

.calc-progress-step.active .progress-label {
    color: var(--text-primary);
}

.calc-progress-line {
    flex: 1;
    height: 2px;
    background: var(--card-border);
    margin: -24px 8px 0;
    position: relative;
    overflow: hidden;
}

.progress-line-fill {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 0%;
    background: var(--primary-neon);
    transition: width 0.5s var(--ease-premium);
}

/* ── Steps Container ── */
.calc-steps-container {
    position: relative;
}

/* Step Groups */
.calc-step {
    margin-bottom: var(--space-6);
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.4s var(--ease-premium), transform 0.4s var(--ease-premium);
    pointer-events: none;
    position: absolute;
    width: 100%;
    visibility: hidden;
}

.calc-step.calc-step-visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
    position: relative;
    visibility: visible;
    will-change: opacity, transform;
}

.calc-step-label {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    margin-bottom: var(--space-3);
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wider);
}

.calc-step-label .step-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: var(--radius-full);
    background: var(--primary-neon);
    color: var(--bg-primary);
    font-size: 0.75rem;
    font-weight: 700;
    flex-shrink: 0;
}

/* Option Cards Grid */
.calc-options {
    display: grid;
    gap: var(--space-3);
}

.calc-options.four-col {
    grid-template-columns: repeat(4, 1fr);
}

.calc-options.three-col {
    grid-template-columns: repeat(3, 1fr);
}

/* Individual Option Card */
.calc-option {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    padding: var(--space-4) var(--space-3);
    background: rgba(255, 255, 255, 0.02);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all 0.3s var(--ease-premium);
    user-select: none;
    text-align: center;
    min-height: 120px;
    overflow: hidden;
}

.calc-option-glow {
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at center, rgba(111, 251, 255, 0.1) 0%, transparent 70%);
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.calc-option:hover {
    border-color: rgba(111, 251, 255, 0.3);
    background: rgba(111, 251, 255, 0.04);
    transform: translateY(-4px) scale(1.01);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.calc-option:hover .calc-option-glow {
    opacity: 1;
}

.calc-option.selected {
    border-color: var(--primary-neon);
    background: rgba(111, 251, 255, 0.08);
    box-shadow: 0 0 20px rgba(111, 251, 255, 0.15), inset 0 0 12px rgba(111, 251, 255, 0.05);
    transform: translateY(-2px) scale(1.02);
}

.calc-option.selected::after {
    content: '';
    position: absolute;
    top: 12px;
    right: 12px;
    width: 22px;
    height: 22px;
    background: var(--primary-neon);
    border-radius: var(--radius-full);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%2308080c' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
    background-size: 13px;
    animation: calc-check-pop 0.4s var(--ease-spring);
    box-shadow: 0 2px 8px rgba(111, 251, 255, 0.4);
}

@keyframes calc-check-pop {
    0% { transform: scale(0); opacity: 0; }
    60% { transform: scale(1.15); }
    100% { transform: scale(1); opacity: 1; }
}

.calc-option-icon {
    width: 40px;
    height: 40px;
    color: var(--text-secondary);
    transition: color 0.3s var(--ease-premium), transform 0.3s var(--ease-premium);
    position: relative;
    z-index: 1;
}

.calc-option:hover .calc-option-icon {
    transform: scale(1.1);
}

.calc-option.selected .calc-option-icon {
    color: var(--primary-neon);
    transform: scale(1.1);
}

.calc-option-name {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 1rem;
    color: var(--text-primary);
    transition: color 0.3s var(--ease-premium);
    position: relative;
    z-index: 1;
}

.calc-option.selected .calc-option-name {
    color: var(--primary-neon);
}

.calc-option-desc {
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: var(--leading-snug);
    position: relative;
    z-index: 1;
}

/* Calculate Button */
.calc-action {
    text-align: center;
    margin-top: var(--space-6);
}

#calcBtn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: 1rem 3rem;
    min-height: 54px;
    border: 1px solid var(--primary-neon);
    background: transparent;
    color: var(--primary-neon);
    border-radius: var(--radius-md);
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: var(--tracking-wide);
    cursor: pointer;
    transition: all 0.3s var(--ease-premium);
    box-shadow: var(--shadow-glow);
    position: relative;
    overflow: hidden;
}

#calcBtn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--primary-neon);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 0;
}

#calcBtn:hover {
    box-shadow: var(--shadow-glow-strong);
    transform: translateY(-2px);
}

#calcBtn:hover::before {
    opacity: 1;
}

#calcBtn:hover span,
#calcBtn:hover i {
    color: var(--bg-primary);
}

#calcBtn:active {
    transform: translateY(0) scale(0.98);
}

#calcBtn span,
#calcBtn i {
    position: relative;
    z-index: 1;
    transition: color 0.3s ease;
}

#calcBtn:disabled {
    opacity: 0.35;
    pointer-events: none;
    border-color: var(--text-secondary);
    color: var(--text-secondary);
    box-shadow: none;
}

#calcBtn i {
    width: 20px;
    height: 20px;
}

/* ─── Results Panel — Premium Summary Card ───────────────── */
.calc-results {
    display: none;
    margin-top: var(--space-8);
    padding: var(--space-6);
    background: rgba(15, 15, 25, 0.6);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-xl);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.calc-results-glow {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--viz-accent, #7c3aed), var(--primary-neon));
    opacity: 0.8;
}

.calc-results.visible {
    display: block;
    animation: calcResultEntrance 0.6s var(--ease-out-expo) forwards;
}

@keyframes calcResultEntrance {
    0% {
        opacity: 0;
        transform: translateY(30px) scale(0.98);
    }
    100% {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.calc-results-header {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-6);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--card-border);
}

.results-header-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, rgba(124, 58, 237, 0.2), rgba(111, 251, 255, 0.2));
    border: 1px solid rgba(111, 251, 255, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-neon);
    box-shadow: var(--shadow-glow);
}

.results-header-icon i {
    width: 24px;
    height: 24px;
}

.calc-results-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

.results-subtitle {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Summary Grid */
.calc-summary-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-4);
    margin-bottom: var(--space-6);
}

.calc-summary-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3);
    background: rgba(255, 255, 255, 0.02);
    border-radius: var(--radius-md);
    border: 1px solid var(--card-border);
}

.summary-icon {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.05);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
}

.summary-icon i {
    width: 18px;
    height: 18px;
}

.summary-content {
    display: flex;
    flex-direction: column;
}

.summary-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wider);
}

.summary-value {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
}

/* Stats Grid */
.calc-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-4);
    margin-bottom: var(--space-8);
}

.calc-stat {
    text-align: center;
    padding: var(--space-4);
    background: linear-gradient(180deg, rgba(111, 251, 255, 0.05) 0%, transparent 100%);
    border: 1px solid rgba(111, 251, 255, 0.15);
    border-radius: var(--radius-lg);
    transition: all 0.3s var(--ease-premium);
}

.calc-stat:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(111, 251, 255, 0.08);
    border-color: rgba(111, 251, 255, 0.3);
}

.calc-stat-value {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-neon);
    text-shadow: 0 0 12px var(--primary-neon-glow);
    margin-bottom: 0.5rem;
}

.calc-stat-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wider);
    font-weight: 600;
}

/* AI CTA */
.calc-cta-wrapper {
    text-align: center;
    padding-top: var(--space-5);
    border-top: 1px solid var(--card-border);
    margin-top: var(--space-6);
}

.calc-cta-wrapper p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-4);
}

/* ─── Product Recommendation Cards ──────────────────────── */
.calc-product-recs {
    margin-bottom: var(--space-2);
}

.calc-recs-label {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-bottom: var(--space-4);
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--text-primary);
}

.calc-recs-label i {
    color: var(--primary-neon);
    width: 20px;
    height: 20px;
}

.calc-product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-4);
}

.rec-card {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-4);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-xl);
    position: relative;
    transition: all 0.3s var(--ease-premium);
    background: rgba(255, 255, 255, 0.02);
}

.rec-card:hover {
    border-color: rgba(111, 251, 255, 0.3);
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
    background: rgba(111, 251, 255, 0.03);
}

.rec-card:active {
    transform: translateY(-2px) scale(0.99);
}

.rec-card.rec-top {
    border-color: rgba(111, 251, 255, 0.4);
    background: linear-gradient(135deg, rgba(111, 251, 255, 0.05), transparent);
    box-shadow: inset 0 0 20px rgba(111, 251, 255, 0.05);
}

.rec-badge {
    position: absolute;
    top: -10px;
    right: 16px;
    background: linear-gradient(90deg, var(--primary-neon), #00c8d5);
    color: #000;
    font-size: 0.7rem;
    font-weight: 800;
    padding: 4px 12px;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wide);
    box-shadow: 0 4px 12px rgba(111, 251, 255, 0.3);
}

.rec-img {
    width: 80px;
    height: 80px;
    object-fit: cover;
    border-radius: var(--radius-sm);
    flex-shrink: 0;
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: #000;
}

.rec-info {
    flex: 1;
    min-width: 0;
}

.rec-info h4 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--text-primary);
}

.rec-specs {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.rec-meta {
    display: flex;
    gap: var(--space-3);
    flex-wrap: wrap;
    font-size: 0.8rem;
    align-items: center;
}

.rec-qty {
    background: rgba(124, 58, 237, 0.15);
    color: #bfa1ff;
    padding: 2px 8px;
    border-radius: var(--radius-md);
    font-weight: 600;
    border: 1px solid rgba(124, 58, 237, 0.3);
}

.rec-eff {
    color: #00ff88;
    font-weight: 500;
}

.rec-price {
    color: var(--text-primary);
    font-weight: 700;
    font-size: 0.95rem;
    margin-left: auto;
}

/* Light theme recs */
body.light-theme .rec-card {
    background: rgba(255, 255, 255, 0.78);
    border-color: rgba(17, 24, 39, 0.06);
    box-shadow:
        0 1px 0 rgba(255, 255, 255, 0.72) inset,
        0 10px 28px rgba(15, 23, 42, 0.055);
    backdrop-filter: blur(12px) saturate(120%);
    -webkit-backdrop-filter: blur(12px) saturate(120%);
}

body.light-theme .rec-card:hover {
    background: rgba(255, 255, 255, 0.90);
    border-color: rgba(111, 107, 232, 0.16);
    box-shadow:
        0 1px 0 rgba(255, 255, 255, 0.82) inset,
        0 16px 42px rgba(15, 23, 42, 0.08);
}

body.light-theme .rec-card.rec-top {
    background:
        linear-gradient(135deg, rgba(111, 107, 232, 0.09), rgba(255, 255, 255, 0.72));
    border-color: rgba(111, 107, 232, 0.18);
}

body.light-theme .rec-badge {
    color: #FFFFFF;
}

body.light-theme .rec-eff {
    color: #00aa55;
}

body.light-theme .rec-qty {
    background: rgba(124, 58, 237, 0.08);
    color: #6d28d9;
    border-color: rgba(124, 58, 237, 0.2);
}

#calcAiCta {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 2.5rem;
    background: linear-gradient(135deg, rgba(124, 58, 237, 0.15), rgba(111, 251, 255, 0.15));
    border: 1px solid rgba(124, 58, 237, 0.5);
    color: #e0e0ff;
    border-radius: var(--radius-md);
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s var(--ease-premium);
    position: relative;
    overflow: hidden;
    letter-spacing: var(--tracking-wide);
    box-shadow: 0 4px 15px rgba(124, 58, 237, 0.15);
}

#calcAiCta::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    opacity: 0;
    background: linear-gradient(135deg, rgba(124, 58, 237, 0.4), rgba(111, 251, 255, 0.4));
    transition: opacity 0.3s;
    z-index: 0;
}

#calcAiCta:hover::before {
    opacity: 1;
}

#calcAiCta:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 8px 25px rgba(124, 58, 237, 0.3), 0 0 40px rgba(111, 251, 255, 0.15);
    border-color: rgba(124, 58, 237, 0.8);
    color: #fff;
}

#calcAiCta:active {
    transform: translateY(-1px) scale(0.98);
}

#calcAiCta i, #calcAiCta span {
    position: relative;
    z-index: 1;
}

#calcAiCta i {
    width: 20px;
    height: 20px;
    color: var(--primary-neon);
    animation: calcCtaPulse 2s ease-in-out infinite;
}

@keyframes calcCtaPulse {
    0%, 100% { opacity: 1; transform: scale(1); filter: drop-shadow(0 0 5px rgba(111, 251, 255, 0.5)); }
    50% { opacity: 0.8; transform: scale(1.15); filter: drop-shadow(0 0 10px rgba(111, 251, 255, 0.8)); }
}

/* ─── Light Theme ───────────────────────────────────────── */
body.light-theme .calc-option {
    background: rgba(255, 255, 255, 0.74);
    border-color: rgba(17, 24, 39, 0.06);
    box-shadow:
        0 1px 0 rgba(255, 255, 255, 0.70) inset,
        0 8px 24px rgba(15, 23, 42, 0.045);
    backdrop-filter: blur(12px) saturate(120%);
    -webkit-backdrop-filter: blur(12px) saturate(120%);
}

body.light-theme .calc-option:hover {
    background: rgba(255, 255, 255, 0.90);
    border-color: rgba(111, 107, 232, 0.22);
    box-shadow: 0 14px 34px rgba(15, 23, 42, 0.075);
}

body.light-theme .calc-option.selected {
    background: rgba(111, 107, 232, 0.10);
    border-color: var(--primary-neon);
    box-shadow: 0 12px 30px rgba(111, 107, 232, 0.14);
}

body.light-theme .calc-results {
    background: rgba(255, 255, 255, 0.82);
    border-color: rgba(17, 24, 39, 0.06);
    box-shadow:
        0 1px 0 rgba(255, 255, 255, 0.78) inset,
        var(--shadow-xl);
    backdrop-filter: blur(16px) saturate(120%);
    -webkit-backdrop-filter: blur(16px) saturate(120%);
}

body.light-theme .calc-stat {
    background: rgba(111, 107, 232, 0.06);
    border-color: rgba(111, 107, 232, 0.16);
}

body.light-theme .calc-stat:hover {
    border-color: rgba(111, 107, 232, 0.28);
    box-shadow: 0 4px 20px rgba(111, 107, 232, 0.08);
}

body.light-theme .calc-stat-value {
    color: #5551cf;
    text-shadow: none;
}

body.light-theme .calc-option-glow {
    background: radial-gradient(circle at center, rgba(111, 107, 232, 0.08) 0%, transparent 70%);
}

body.light-theme .progress-line-fill {
    background: var(--primary-neon);
}

body.light-theme .results-header-icon {
    background: rgba(111, 107, 232, 0.12);
    border-color: rgba(111, 107, 232, 0.22);
    color: #5551cf;
    box-shadow: 0 10px 24px rgba(111, 107, 232, 0.08);
}

body.light-theme .calc-results-glow {
    background: linear-gradient(90deg, #6f6be8, var(--primary-neon));
}

body.light-theme .rec-img {
    border-color: rgba(17, 24, 39, 0.06);
    background: #f1f4f9;
}

body.light-theme .calc-summary-item {
    background: rgba(248, 250, 252, 0.78);
    border-color: rgba(17, 24, 39, 0.06);
}

body.light-theme .summary-icon {
    background: rgba(111, 107, 232, 0.10);
    color: #5551cf;
}

body.light-theme #calcAiCta {
    background: linear-gradient(135deg, rgba(111, 107, 232, 0.10), rgba(255, 255, 255, 0.62));
    color: #3a3a5a;
    border-color: rgba(111, 107, 232, 0.26);
    box-shadow: 0 10px 28px rgba(111, 107, 232, 0.10);
}

body.light-theme #calcAiCta:hover {
    color: #fff;
}

body.light-theme #calcBtn {
    background: linear-gradient(135deg, #7470ee 0%, #5d5ad8 100%);
    color: #fff;
    border: none;
    box-shadow: 0 12px 30px rgba(93, 90, 216, 0.20);
}

body.light-theme #calcBtn:hover {
    filter: brightness(1.03);
    box-shadow: 0 16px 38px rgba(93, 90, 216, 0.24);
    transform: translateY(-2px) scale(1.01);
}

body.light-theme .progress-dot {
    background: rgba(255, 255, 255, 0.82);
    border-color: rgba(17, 24, 39, 0.08);
}

body.light-theme .calc-progress-line {
    background: #e3e8f2;
}

/* ─── Responsive ────────────────────────────────────────── */
@media (max-width: 900px) {
    .calc-options.four-col {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .calc-summary-grid {
        grid-template-columns: 1fr;
        gap: var(--space-3);
    }
    
    .calc-stats {
        grid-template-columns: 1fr;
        gap: var(--space-3);
    }
}

@media (max-width: 768px) {
    .calc-options.three-col {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .calc-results {
        padding: var(--space-4);
    }
    
    .calc-results-header {
        flex-direction: column;
        text-align: center;
    }
    
    .rec-card {
        flex-direction: column;
        text-align: center;
    }
    
    .rec-meta {
        justify-content: center;
    }
    
    .rec-price {
        margin-left: 0;
        width: 100%;
        margin-top: 8px;
    }
}

@media (max-width: 480px) {
    .calc-options.three-col, .calc-options.four-col {
        grid-template-columns: 1fr;
    }
    
    .calc-progress {
        flex-direction: column;
        gap: 16px;
    }
    
    .calc-progress-line {
        display: none;
    }
    
    .calc-stat-value {
        font-size: 1.5rem;
    }
}