/* --- Global Resets & Variables --- */
:root {
    --bg-color: #ffffff;
    --surface-color: #f6f6f6;
    --text-primary: #111111;
    --text-secondary: #666666;
    --border-color: #d2d2d7;
    --black: #000000;
    --white: #ffffff;
    --border-radius-primary: 20px;
    --border-radius-secondary: 12px;
    --font-stack: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-display: 'Space Grotesk', 'Inter', -apple-system, sans-serif;
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-family: var(--font-stack);
    background-color: var(--bg-color);
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

/* --- Utilities --- */
.divider {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 2rem 0;
}

.divider.subtle {
    margin: 1.5rem 0;
    border-color: #e5e5e5;
}

.hidden {
    display: none !important;
}

/* --- Header Section --- */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.header-container {
    width: 100%;
    padding: 0.9rem 2.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
}

.header-logo {
    height: 32px;
    width: auto;
}

.logo-text {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1.1rem;
    letter-spacing: 0.5px;
    color: var(--black);
}

.main-nav a {
    text-decoration: none;
    color: var(--text-primary);
    font-size: 0.9rem;
    margin-right: 2rem;
    font-weight: 500;
    transition: var(--transition-smooth);
}

.main-nav a:hover {
    color: var(--text-secondary);
}

/* --- Hero Section --- */
.hero {
    min-height: 90vh;
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    max-width: 1400px;
    margin: 0 auto;
    padding: 6rem 2rem 2rem 2rem;
}

.hero-content {
    padding-right: 4rem;
}

.hero-subtitle {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    font-weight: 500;
}

.hero-title {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    line-height: 1.05;
    margin-bottom: 0.5rem;
}

.hero-description {
    font-size: 1.15rem;
    line-height: 1.6;
    color: var(--text-secondary);
    margin-bottom: 1.75rem;
}

.hero-image-container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;
}

.hero-image-display {
    max-width: 90%;
    height: auto;
}

/* --- Buttons --- */
.btn {
    display: inline-block;
    padding: 0.9rem 2.2rem;
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: 30px;
    text-decoration: none;
    transition: var(--transition-smooth);
    cursor: pointer;
    border: none;
    text-align: center;
}

.btn-snall {
    display: inline-block;
    padding: 0.5rem 1.2rem;
    font-size: 0.8rem;
    font-weight: 500;
    border-radius: 20px;
    text-decoration: none;
    transition: var(--transition-smooth);
    cursor: pointer;
    border: none;
    text-align: center;
}

.btn-black {
    background-color: var(--black);
    color: white;
}

.btn-black:hover {
    background-color: #222;
}

.btn-primary {
    background-color: var(--black);
    color: white;
    border-radius: 8px;
    padding: 0.85rem 1.9rem;
    letter-spacing: 0.3px;
}

.btn-primary:hover {
    transform: translateY(-2px);
}

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--black);
}

.btn-outline:hover {
    background-color: #f5f5f7;
}

.btn-full {
    width: 100%;
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    pointer-events: none;
}

/* --- Configurator Section --- */
.configurator-section {
    background-color: var(--surface-color);
    padding: 7rem 2rem;
}

.configurator-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 5rem;
}

.preview-sticky {
    position: sticky;
    top: 100px;
}

.bike-visual-card {
    background-color: var(--bg-color);
    border-radius: var(--border-radius-primary);
    padding: 2rem;
    display: flex;
    flex-direction: column;
    height: auto;
    min-height: 400px;
    position: relative;
    box-shadow: 0 10px 40px rgba(0,0,0,0.03);
}

.preview-label {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.preview-image-display {
    max-width: 100%;
    margin: auto;
    height: auto;
}

/* --- Config Form Controls --- */
.tag {
    display: inline-block;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    background-color: var(--border-color);
    padding: 6px 14px;
    border-radius: 14px;
    font-weight: 700;
    margin-bottom: 1rem;
}

.details-header h2 {
    font-size: 2.1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    letter-spacing: -0.5px;
    white-space: nowrap;
}

.price-display-subtitle {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.price-display {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 600;
    letter-spacing: -1px;
    font-variant-numeric: tabular-nums;
}

#totalPrice,
#totalPriceSummary {
    display: inline-block;
    transform-origin: left center;
}

#totalPrice.price-pulse-down,
#totalPriceSummary.price-pulse-down {
    animation: pricePulseDown 0.45s ease-out;
}

#totalPrice.price-pulse-up,
#totalPriceSummary.price-pulse-up {
    animation: pricePulseUp 0.45s ease-out;
}

@keyframes pricePulseDown {
    0% { transform: scale(1); color: var(--text-primary); }
    35% { transform: scale(1.12); color: #00802b; }
    100% { transform: scale(1); color: var(--text-primary); }
}

@keyframes pricePulseUp {
    0% { transform: scale(1); color: var(--text-primary); }
    35% { transform: scale(1.12); color: #c0341d; }
    100% { transform: scale(1); color: var(--text-primary); }
}

.product-summary {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-top: 1rem;
}

.config-group {
    margin-bottom: 2rem;
}

.group-title {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-primary);
}

.group-title-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    width: 100%;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.group-title-link .gt-text {
    text-decoration: underline;
    text-underline-offset: 3px;
    text-decoration-thickness: 1px;
    text-decoration-color: var(--border-color);
    transition: var(--transition-smooth);
}

.group-title-link .gt-arrow {
    font-size: 1.15rem;
    line-height: 1;
    color: var(--text-secondary);
    transition: var(--transition-smooth);
}

.group-title-link:hover .gt-text {
    text-decoration-color: var(--black);
}

.group-title-link:hover .gt-arrow {
    color: var(--black);
    transform: translateX(3px);
}

/* Highlight when jumped to from a config option — accent bar + soft wash fade */
.spec-flash {
    animation: specHighlight 1.4s ease-out;
}

@keyframes specHighlight {
    0% {
        background-color: rgba(0, 0, 0, 0.05);
        box-shadow: inset 3px 0 0 rgba(0, 0, 0, 1);
    }
    100% {
        background-color: rgba(0, 0, 0, 0);
        box-shadow: inset 3px 0 0 rgba(0, 0, 0, 0);
    }
}

/* Fixed Option Styling */
.fixed-spec-tile {
    background-color: white;
    border: 1px solid var(--black);
    padding: 1rem 1.2rem;
    border-radius: var(--border-radius-secondary);
    display: flex;
    flex-direction: column;
}

.fixed-option .spec-value {
    font-weight: 500;
    font-size: 1rem;
}

.fixed-option .spec-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.specs-inline-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

/* Interactive Choices Tiles */
.tile-options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.tile-options.vertical {
    grid-template-columns: 1fr;
}

/* Seatpost: standard full-width, paid options share a row */
.tile-options.seatpost-options {
    grid-template-columns: 1fr 1fr;
}

.tile-options.seatpost-options .span-full {
    grid-column: 1 / -1;
}

.tile-container {
    cursor: pointer;
}

.tile-container input {
    display: none;
}

.tile-box {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-secondary);
    padding: 1rem 1.2rem;
    display: flex;
    flex-direction: column;
    gap: 0.1rem;
    transition: var(--transition-smooth);
}

.tile-box:hover {
    border-color: #b0b0b5;
}

.tile-container input:checked + .tile-box {
    border-color: var(--black);
    background-color: #fafafa;
}

.standard-flex {
    flex-direction: row !important;
    justify-content: space-between;
    align-items: center;
}

/* Unavailable / not-yet-interactive options */
.tile-container.disabled {
    cursor: not-allowed;
}

.tile-container.disabled .tile-box {
    background-color: var(--surface-color);
    border-style: dashed;
    opacity: 0.6;
    pointer-events: none;
}

.option-badge {
    font-family: var(--font-display);
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    padding: 3px 8px;
    border-radius: 8px;
    white-space: nowrap;
}

.option-price.unavailable {
    color: var(--text-secondary);
    font-weight: 500;
}

.tile-main {
    display: block;
    font-size: 1rem;
    font-weight: 500;
}

.tile-sub {
    display: block;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.option-price {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 0.95rem;
    white-space: nowrap;
    font-variant-numeric: tabular-nums;
}

.option-price.included {
    font-weight: 500;
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Action Zone */
.action-interaction-zone {
    margin-top: 3rem;
}

.button-action-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.button-action-group .btn-full {
    flex: 1;
    width: auto;
}

.btn-mail {
    flex: 0 0 auto;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    color: var(--black);
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.btn-mail:hover {
    background-color: var(--black);
    border-color: var(--black);
    color: var(--white);
}

.btn-mail svg {
    width: 19px;
    height: 19px;
    display: block;
}

.discount-badge {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    margin-bottom: 0.75rem;
}

.discount-tag {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: #00802b;
    background-color: rgba(0, 128, 43, 0.1);
    padding: 4px 10px;
    border-radius: 10px;
}

.discount-amount {
    font-size: 0.85rem;
    font-weight: 600;
    color: #00802b;
}

.total-summary {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 1.5rem;
}

.total-original {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 400;
    color: var(--text-secondary);
    text-decoration: line-through;
    margin-right: 0.5rem;
    font-variant-numeric: tabular-nums;
}

.total-summary-label {
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
}

.total-summary-price {
    font-family: var(--font-display);
    font-size: 1.8rem;
    font-weight: 600;
    letter-spacing: -0.5px;
    font-variant-numeric: tabular-nums;
}

.email-capture {
    margin-bottom: 1.5rem;
}

.form-instruction {
    display: block;
    font-weight: 600;
    margin-bottom: 0.75rem;
    font-size: 0.95rem;
}

.email-capture input {
    width: 100%;
    padding: 0.9rem 1rem;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    font-family: var(--font-stack);
    font-size: 0.9rem;
    transition: var(--transition-smooth);
}

.email-capture input + input {
    margin-top: 0.6rem;
}

.name-row {
    display: flex;
    gap: 0.6rem;
}

.email-capture .name-row input {
    margin-top: 0;
    flex: 1 1 0;
    min-width: 0;
}

.name-row + input {
    margin-top: 0.6rem;
}

.email-capture input:focus {
    outline: none;
    border-color: var(--black);
}

.submit-controls {
    overflow: hidden;
    transition: max-height 0.45s cubic-bezier(0.4, 0, 0.2, 1),
                opacity 0.35s ease,
                transform 0.35s ease;
}

.submit-controls.collapsed {
    opacity: 0;
    transform: translateY(-10px);
    pointer-events: none;
}

.form-feedback {
    margin-top: 1rem;
    color: #00802b;
    font-weight: 500;
    font-size: 0.9rem;
}

.form-feedback.error {
    color: #c0341d;
}

.form-feedback.feedback-in {
    animation: feedbackIn 0.5s cubic-bezier(0.4, 0, 0.2, 1) both;
}

@keyframes feedbackIn {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* --- Specs Section --- */
.specs-section {
    max-width: 1200px;
    margin: 0 auto;
    padding: 8rem 2rem;
}

.section-header {
    margin-bottom: 4rem;
}

.section-header h2 {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    letter-spacing: -0.5px;
}

.section-header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.specs-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 3rem 2rem;
}

.spec-card {
    border-top: 1px solid var(--border-color);
    padding-top: 1.5rem;
}

.spec-index {
    font-family: var(--font-display);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    font-weight: 600;
    color: var(--text-secondary);
    display: block;
    margin-bottom: 0.75rem;
}

.spec-card h3 {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.spec-card p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Featured component cards */
.spec-card.featured {
    display: block;
    text-decoration: none;
    color: inherit;
    border-top: 2px solid var(--black);
    padding: 1.5rem;
    transition: var(--transition-smooth);
}

.spec-card.featured {
    cursor: default;
}

.spec-card.featured:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.06);
}

.spec-brand {
    font-family: var(--font-display);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-primary);
    display: block;
    margin-bottom: 0.25rem;
}

.spec-model {
    font-size: 0.85rem !important;
    font-weight: 500;
    color: var(--text-primary) !important;
    margin-bottom: 0.75rem;
}

.spec-link {
    display: inline-block;
    margin-top: 1rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--black);
}

.spec-link::after {
    content: " ↗";
}

a.spec-card.featured:hover .spec-link {
    text-decoration: underline;
}

/* Full component list dropdown */
.spec-details {
    margin-top: 3rem;
    border-top: 1px solid var(--border-color);
}

.spec-details summary {
    list-style: none;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 0;
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
}

.spec-details summary::-webkit-details-marker {
    display: none;
}

.spec-summary-icon {
    font-size: 1.4rem;
    font-weight: 400;
    color: var(--text-secondary);
    transition: var(--transition-smooth);
}

.spec-details[open] .spec-summary-icon {
    transform: rotate(45deg);
}

.spec-table {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    padding-bottom: 1rem;
}

.spec-row {
    display: flex;
    align-items: baseline;
    gap: 0.75rem;
    padding: 0.85rem 1rem;
    border-top: 1px solid #ededed;
    text-decoration: none;
    color: inherit;
    transition: var(--transition-smooth);
}

.spec-row:hover {
    background-color: var(--surface-color);
}

.spec-row-name {
    font-weight: 600;
    font-size: 0.9rem;
    flex-shrink: 0;
    min-width: 130px;
}

.spec-row-detail {
    font-size: 0.85rem;
    color: var(--text-secondary);
    flex-grow: 1;
}

.spec-row-link {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--black);
    flex-shrink: 0;
    opacity: 0;
    transition: var(--transition-smooth);
}

.spec-row:hover .spec-row-link {
    opacity: 1;
}

/* --- Footer --- */
.site-footer {
    background-color: #f6f6f6;
    color: var(--text-primary);
    padding: 5rem 2rem 2rem 2rem;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    margin-bottom: 4rem;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.footer-logo {
    height: 40px;
    width: auto;
    align-self: flex-start;
    object-fit: contain;
    margin-bottom: 0.5rem;
}

.footer-brand h3 {
    font-family: var(--font-display);
    font-size: 1.2rem;
    letter-spacing: 0.5px;
    margin-bottom: 0.25rem;
}

.footer-brand p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    gap: 5rem;
}

.link-column {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.link-column h4 {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.link-column a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition-smooth);
}

.link-column a:hover {
    color: var(--black);
}

.footer-bottom {
    max-width: 1200px;
    margin: 0 auto;
    border-top: 1px solid var(--border-color);
    padding-top: 2rem;
    font-size: 0.85rem;
    color: #666;
}

/* --- Responsive Adjustments --- */
@media (max-width: 968px) {
    .hero {
        grid-template-columns: 1fr;
        padding-top: 8rem;
        gap: 3rem;
        text-align: center;
    }
    .hero-content {
        padding-right: 0;
    }
    .configurator-container {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    .preview-sticky {
        position: relative;
        top: 0;
    }
    .specs-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .spec-table {
        grid-template-columns: 1fr;
    }
    .specs-inline-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .specs-grid {
        grid-template-columns: 1fr;
    }
    .spec-row-link {
        opacity: 1;
    }
    .hero-title {
        font-size: 2.75rem;
    }
    .footer-container {
        flex-direction: column;
        gap: 3rem;
    }
    .site-header {
        position: relative;
        background: white;
    }
    .main-nav, .header-cta {
        display: none;
    }
    .tile-options,
    .tile-options.seatpost-options {
        grid-template-columns: 1fr;
    }
    .button-action-group {
        flex-wrap: wrap;
    }
    #applyPurchaseBtn {
        flex-basis: 100%;
    }
    .details-header h2 {
        font-size: 1.8rem;
        white-space: normal;
    }
}