body {
    background-color: var(--color-bg);
    color: var(--color-text-main);
    transition: var(--transition-theme);
    overflow-x: hidden;
    /* Prevent horizontal scroll from animations */
}

/* ============ HERO SECTION ============ */
.hero-heading {
    text-align: center;
    margin: 0;
    padding: calc(var(--header-height) + 4rem) var(--container-padding) 6rem;
    width: 100%;
    color: white !important;
    position: relative;
    background: linear-gradient(135deg, rgba(26, 34, 56, 0.9), rgba(26, 34, 56, 0.7)), url('../Images/Services/engineering.png');
    background-size: cover;
    background-position: center;
    background-attachment: scroll;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
    clip-path: polygon(0 0, 100% 0, 100% 90%, 0 100%);
    /* Modern slant */
    margin-bottom: -3rem;
    /* Overlap with container */
    z-index: 1;
}

.hero-heading h1 {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 800;
    line-height: 1.1;
    color: white !important;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    animation: fadeInUp 0.8s ease-out;
}

.hero-heading h2 {
    font-size: clamp(1.2rem, 2vw, 1.8rem);
    font-weight: 500;
    color: var(--accent-orange) !important;
    margin-bottom: 0;
    animation: fadeInUp 0.8s ease-out 0.2s backwards;
}

.hero-description {
    animation: fadeInUp 0.8s ease-out 0.4s backwards;
}

/* ============ CONTAINER & LAYOUT ============ */
.container {
    max-width: 1600px;
    margin: 0 auto 4rem;
    padding-inline: var(--container-padding);
    background-color: transparent;
    width: 100%;
    position: relative;
    z-index: 2;
    /* Sit on top of hero */
}

.calculator-container {
    background: var(--color-surface);
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1);
    padding: clamp(1.5rem, 4vw, 2.5rem);
    border: 1px solid rgba(255, 255, 255, 0.5);
    margin: 0 auto;
    width: 100%;
    transition: var(--transition-theme);
    backdrop-filter: blur(10px);
    /* Subtle glass effect if bg is transparent */
}

.calculator-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--gap-lg);
    grid-template-areas:
        "setup materials"
        "estimate summary";
    width: 100%;
}

.panel-project-setup {
    grid-area: setup;
}

.panel-materials-spec {
    grid-area: materials;
}

.panel-get-estimate {
    grid-area: estimate;
}

.panel-cost-summary {
    grid-area: summary;
}

/* ============ PANELS ============ */
.panel {
    background: var(--bg-white);
    padding: 2.2rem;
    border-radius: 16px;
    border: 1px solid var(--color-border);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.03);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    animation: slideUpFade 0.8s cubic-bezier(0.2, 0.8, 0.2, 1) backwards;
}

.panel:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.08);
}

/* Stagger animations */
.panel-project-setup {
    animation-delay: 0.1s;
}

.panel-materials-spec {
    animation-delay: 0.2s;
}

.panel-get-estimate {
    animation-delay: 0.3s;
}

.panel-cost-summary {
    animation-delay: 0.4s;
}

.panel h4 {
    font-size: 1.4rem;
    color: var(--primary-navy);
    font-weight: 700;
    margin-top: 0;
    margin-bottom: 2rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid rgba(0, 0, 0, 0.05);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
}

.panel h4::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 60px;
    height: 2px;
    background: var(--accent-orange);
    transition: width 0.3s ease;
}

.panel:hover h4::after {
    width: 100px;
}

/* ============ FORM ELEMENTS ============ */
.form-group {
    margin-bottom: 1.5rem;
    position: relative;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--color-text-main);
    font-size: 0.9rem;
    transition: color 0.3s ease;
}

.form-group:focus-within label {
    color: var(--accent-orange);
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.9rem 1rem;
    border-radius: 10px;
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    color: var(--color-text-main);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 1rem;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.02);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent-orange);
    box-shadow: 0 0 0 4px rgba(255, 106, 61, 0.15);
    background: var(--bg-white);
    transform: translateY(-2px);
}

.form-group input:hover,
.form-group select:hover {
    border-color: #aaa;
}

/* Checkbox Styling */
.form-group input[type="checkbox"] {
    width: 1.2rem;
    height: 1.2rem;
    margin-right: 0.5rem;
    accent-color: var(--accent-orange);
    vertical-align: middle;
    cursor: pointer;
    box-shadow: none;
    transform: none !important;
}

.row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

/* ============ AI ASSISTANT ============ */
.chat-assistant {
    background: linear-gradient(145deg, var(--bg-white), var(--color-surface));
    border-radius: 16px;
    padding: 2rem;
    margin-bottom: 3rem;
    box-shadow: 0 15px 50px rgba(0, 0, 0, 0.08);
    /* More diffuse shadow */
    border: 1px solid rgba(255, 106, 61, 0.1);
    position: relative;
    overflow: hidden;
    animation: slideUpFade 0.8s ease-out;
}

.chat-assistant::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-navy), var(--accent-orange));
}

.chat-assistant .chat-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.chat-assistant .chat-header h2 {
    margin: 0;
    font-size: 1.4rem;
    background: linear-gradient(to right, var(--primary-navy), var(--accent-orange));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.chat-icon {
    font-size: 2rem;
    animation: float 3s ease-in-out infinite;
}

.chat-input-group {
    display: flex;
    gap: 1rem;
    position: relative;
    z-index: 2;
}

.chat-input {
    flex-grow: 1;
    padding: 1rem 1.5rem;
    border-radius: 50px;
    border: 2px solid var(--color-border);
    background: var(--bg-white);
    font-size: 1rem;
    transition: all 0.3s ease;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
}

.chat-input:focus {
    border-color: var(--accent-orange);
    box-shadow: 0 8px 30px rgba(255, 106, 61, 0.15);
}

.chat-btn {
    background: var(--primary-navy);
    color: white;
    padding: 0 2rem;
    border-radius: 50px;
    border: none;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(26, 34, 56, 0.3);
}

.chat-btn:hover {
    background: var(--accent-orange);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(255, 106, 61, 0.4);
}

/* ============ ACCORDION ============ */
.accordion .accordion-title {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.2rem;
    background: var(--color-surface);
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    margin-bottom: 0.8rem;
    transition: all 0.3s ease;
    border: 1px solid transparent;
}

.accordion .accordion-title:hover {
    background: #eef2f6;
    /* Light gray for hover */
    color: var(--primary-navy);
    transform: translateX(5px);
}

.accordion .accordion-title.active {
    background: #eef2f6;
    border-color: var(--color-border);
    color: var(--accent-orange);
}

.accordion-content {
    padding: 1.5rem;
    border-left: 2px solid var(--accent-orange);
    margin-left: 1rem;
    background: rgba(255, 255, 255, 0.5);
    display: none;
    animation: fadeIn 0.4s ease;
}

.accordion-content.open {
    display: block;
}

/* ============ COST BREAKDOWN CARD ============ */
.cost-breakdown {
    background: linear-gradient(160deg, #ffffff, #f8f9fa);
    border: 1px solid var(--color-border);
    padding: 2rem;
    border-radius: 12px;
    margin-bottom: 2rem;
    box-shadow: inset 0 2px 20px rgba(0, 0, 0, 0.02);
    position: relative;
    overflow: hidden;
}

.cost-breakdown::after {
    content: '';
    position: absolute;
    top: 0;
    width: 100%;
    height: 100%;
    left: 0;
    background-image: radial-gradient(circle at top right, rgba(255, 106, 61, 0.05), transparent 40%);
    pointer-events: none;
}

.cost-row {
    display: flex;
    justify-content: space-between;
    padding: 0.8rem 0;
    border-bottom: 1px dashed var(--color-border);
    font-size: 0.95rem;
}

.cost-row strong {
    color: var(--primary-navy);
}

.total-cost {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--bg-white);
    text-align: center;
    margin-top: 1.5rem;
    padding: 1.5rem;
    background: linear-gradient(135deg, var(--primary-navy), #2a3452);
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(26, 34, 56, 0.2);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.total-cost span {
    color: var(--accent-orange);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

/* ============ BUTTONS ============ */
.btn-primary,
.btn-secondary,
.btn-export {
    padding: 1rem 1.5rem;
    border-radius: 10px;
    border: none;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-align: center;
    display: inline-block;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.btn-primary {
    background: var(--primary-navy);
    color: white;
    width: 60%;
}

.btn-primary:hover {
    background: var(--accent-orange);
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(255, 106, 61, 0.3);
}

.export-section {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.btn-secondary {
    background: #e2e8f0;
    color: var(--primary-navy);
    flex: 1;
}

.btn-secondary:hover {
    background: #cbd5e1;
    transform: translateY(-2px);
}

.btn-export {
    background: linear-gradient(135deg, var(--accent-orange), #ff4500);
    color: white;
    flex: 2;
}

.btn-export:hover {
    filter: brightness(1.1);
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(255, 69, 0, 0.3);
}

.btn-export:disabled {
    background: #cbd5e1;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* ============ UTILITIES & ANIMATIONS ============ */
@keyframes slideUpFade {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes float {
    0% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-5px);
    }

    100% {
        transform: translateY(0px);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.add-btn-small {
    background-color: transparent;
    color: var(--accent-orange);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    border: 1px dashed var(--accent-orange);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    width: auto;
    margin-top: 0.8rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.add-btn-small:hover {
    background: rgba(255, 106, 61, 0.1);
    transform: scale(1.02);
}

.toggle-button {
    background: rgba(0, 0, 0, 0.05);
    color: var(--primary-navy);
    border: none;
    border-radius: 50%;
    width: 32px;
    height: 32px;
    font-size: 1.2rem;
    line-height: 1;
    cursor: pointer;
    transition: all 0.3s ease;
    display: grid;
    place-items: center;
}

.toggle-button:hover {
    background: var(--accent-orange);
    color: white;
    transform: rotate(90deg);
}

/* ============ RESPONSIVE MEDIA QUERIES ============ */
@media (max-width: 1024px) {
    .calculator-grid {
        grid-template-columns: 1fr;
        grid-template-areas:
            "setup"
            "materials"
            "estimate"
            "summary";
        gap: 2rem;
    }
}

@media (max-width: 768px) {
    .hero-heading {
        margin-bottom: -4rem;
        /* Adjust overlap */
    }

    .container {
        padding-inline: var(--container-padding);
        margin-top: 0;
    }

    .calculator-container {
        padding: 1.5rem;
        border-radius: 12px;
    }

    .row {
        grid-template-columns: 1fr;
    }

    .export-section {
        flex-direction: column;
    }

    .btn-primary {
        width: 100%;
    }

    .chat-input-group {
        flex-direction: column;
    }

    .chat-btn {
        width: 100%;
        margin-top: 0.5rem;
    }

    .total-cost {
        flex-direction: column;
        gap: 0.5rem;
        text-align: center;
        font-size: 1.5rem;
    }
}