/* ============================================
   TrueBac - Global Styles
   Single-viewport, no-scroll layout
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Oswald:wght@300;400;500;600;700&family=Inter:wght@300;400;500;600&display=swap');

/* --- Variables --- */
:root {
    --off-white: #FAF9F6;
    --light-blue: #89CFF0;
    --white: #FFFFFF;
    --black: #1A1A1A;
    --grey: #6B7280;
    --light-grey: #D1D5DB;
    --nav-height: 70px;
    --page-padding: 60px;
}

/* --- Reset --- */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    overflow: hidden;
}

body {
    background-color: var(--off-white);
    font-family: 'Inter', 'Helvetica Neue', Arial, sans-serif;
    color: var(--black);
    display: flex;
    flex-direction: column;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

/* --- Site Header (Logo + Nav) --- */
.site-header {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-top: 30px;
    flex-shrink: 0;
    background-color: var(--off-white);
    z-index: 100;
}

/* --- Logo --- */
.header-logo {
    font-family: 'Oswald', sans-serif;
    font-size: 3.2rem;
    letter-spacing: 3px;
    margin-bottom: 12px;
    cursor: pointer;
}

.header-logo a {
    text-decoration: none;
}

.logo-true {
    color: var(--black);
}

.logo-bac {
    color: var(--light-blue);
}

/* --- Navigation --- */
.nav {
    display: flex;
    gap: 40px;
    margin-bottom: 10px;
}

.nav a {
    font-family: 'Inter', sans-serif;
    font-size: 0.8rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--grey);
    transition: color 0.3s ease;
    position: relative;
}

.nav a:hover,
.nav a.active {
    color: var(--black);
}

.nav a.active::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 100%;
    height: 1px;
    background-color: var(--light-blue);
}

/* ============================================
   HOME PAGE
   ============================================ */
.hero {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.hero-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 0 var(--page-padding);
}

.hero-tagline {
    font-family: 'Oswald', sans-serif;
    font-size: 1.3rem;
    letter-spacing: 4px;
    color: var(--grey);
    margin-bottom: 40px;
}

.hero-cta {
    display: inline-block;
    padding: 12px 36px;
    background-color: var(--light-blue);
    color: var(--white);
    font-family: 'Inter', sans-serif;
    font-size: 0.8rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 2px;
    border: none;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
}

.hero-cta:hover {
    background-color: #6fb8e6;
    transform: translateY(-1px);
}

.features {
    display: flex;
    justify-content: center;
    gap: 60px;
    padding: 30px var(--page-padding) 35px;
    max-width: 900px;
    margin: 0 auto;
    width: 100%;
    flex-shrink: 0;
}

.feature {
    text-align: center;
    flex: 1;
}

.feature-title {
    font-family: 'Oswald', sans-serif;
    font-size: 1.05rem;
    letter-spacing: 2px;
    margin-bottom: 5px;
    color: var(--black);
}

.feature-text {
    font-size: 0.78rem;
    color: var(--grey);
    line-height: 1.4;
}

/* ============================================
   WATER PAGE
   ============================================ */
.water-page {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 0 var(--page-padding);
}

.page-title {
    font-family: 'Oswald', sans-serif;
    font-size: 2.5rem;
    font-weight: 300;
    letter-spacing: 4px;
    text-align: center;
    margin-bottom: 6px;
}

.page-subtitle {
    text-align: center;
    font-size: 0.82rem;
    color: var(--grey);
    margin-bottom: 40px;
}

.products-container {
    display: flex;
    justify-content: center;
    gap: 20px;
}

.product-card {
    background-color: var(--white);
    border: 1px solid var(--light-grey);
    padding: 25px 20px;
    text-align: center;
    width: 190px;
    transition: border-color 0.3s ease;
}

.product-card:hover {
    border-color: var(--light-blue);
}

.product-card-img {
    background-color: var(--white);
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 15px;
    padding: 10px;
}

.product-card-img {
    position: relative;
    cursor: pointer;
}

.product-card-img img {
    width: 100%;
    max-height: 200px;
    object-fit: contain;
}

.click-enlarge {
    position: absolute;
    bottom: 10px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.58rem;
    color: var(--grey);
    letter-spacing: 1px;
    opacity: 0;
    transition: opacity 0.2s ease;
    pointer-events: none;
    white-space: nowrap;
}

.product-card-img:hover .click-enlarge {
    opacity: 1;
}

/* --- Image Lightbox --- */
.lightbox-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--off-white);
    z-index: 300;
    justify-content: center;
    align-items: center;
    cursor: pointer;
}

.lightbox-overlay.active {
    display: flex;
}

.lightbox-close {
    position: absolute;
    top: 25px;
    right: 30px;
    background: none;
    border: none;
    font-size: 2rem;
    color: var(--grey);
    cursor: pointer;
    transition: color 0.2s ease;
    z-index: 301;
}

.lightbox-close:hover {
    color: var(--black);
}

.lightbox-overlay img {
    max-width: 80vw;
    max-height: 80vh;
    object-fit: contain;
}

.product-card-img img.img-single {
    max-height: 170px;
    align-self: flex-end;
}

.product-card-label {
     font-family: 'Oswald', sans-serif;
     font-size: 0.85rem;
     letter-spacing: 0.5px;
     color: var(--grey);
     margin-bottom: 6px;
 }

.product-card-name {
     font-family: 'Oswald', sans-serif;
     font-size: 1.4rem;
     font-weight: 300;
     letter-spacing: 2px;
     margin-bottom: 4px;
 }

.product-card-volume {
    font-size: 0.75rem;
    color: var(--grey);
    margin-bottom: 15px;
}

.product-card-price {
     font-family: 'Oswald', sans-serif;
     font-size: 1.8rem;
     font-weight: 300;
     letter-spacing: 1px;
     margin-bottom: 18px;
     color: var(--black);
 }

.product-card-btn {
    display: inline-block;
    width: 100%;
    padding: 10px 0;
    background-color: transparent;
    color: var(--black);
    font-family: 'Inter', sans-serif;
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 2px;
    border: 1px solid var(--black);
    cursor: pointer;
    transition: all 0.3s ease;
}

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

/* --- Cart --- */
.cart {
    position: fixed;
    top: 0;
    right: var(--page-padding);
    width: 260px;
    max-height: calc(100vh - 40px);
    display: none;
    flex-direction: column;
    z-index: 150;
    border: 1px solid var(--light-grey);
    background-color: var(--white);
    padding: 20px;
}

.cart.active {
    display: flex;
}

.cart-title {
    font-family: 'Oswald', sans-serif;
    font-size: 1.1rem;
    letter-spacing: 2px;
    margin-bottom: 12px;
    color: var(--black);
}

.cart-items {
    overflow-y: auto;
    flex: 1;
    margin-bottom: 10px;
}

.cart-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 6px 0;
    font-size: 0.78rem;
    color: var(--black);
    border-bottom: 1px solid var(--light-grey);
}

.cart-item:last-child {
    border-bottom: none;
}

.cart-item-name {
    flex: 1;
}

.cart-item-price {
    font-weight: 500;
    margin-left: 12px;
    white-space: nowrap;
}

.cart-item-remove {
    margin-left: 8px;
    background: none;
    border: none;
    color: var(--grey);
    cursor: pointer;
    font-size: 0.72rem;
    transition: color 0.2s ease;
    padding: 0 2px;
}

.cart-item-remove:hover {
    color: var(--black);
}

.cart-divider {
    width: 100%;
    height: 1px;
    background-color: var(--black);
    margin: 4px 0;
}

.cart-summary-line {
    display: flex;
    justify-content: space-between;
    padding: 4px 0;
    font-size: 0.78rem;
    color: var(--grey);
}

.cart-summary-line.total {
    color: var(--black);
    font-weight: 600;
    font-size: 0.85rem;
    padding-top: 6px;
}

.cart-checkout-btn {
    margin-top: 15px;
    padding: 10px 0;
    width: 100%;
    background-color: var(--light-blue);
    color: var(--white);
    font-family: 'Inter', sans-serif;
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 2px;
    border: none;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.cart-checkout-btn:hover {
    background-color: #6fb8e6;
}

/* --- Checkout Modal --- */
.checkout-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(26, 26, 26, 0.5);
    z-index: 200;
    justify-content: center;
    align-items: center;
}

.checkout-overlay.active {
    display: flex;
}

.checkout-modal {
    background-color: var(--white);
    padding: 35px 40px;
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
}

.checkout-close {
    position: absolute;
    top: 15px;
    right: 20px;
    background: none;
    border: none;
    font-size: 1.4rem;
    cursor: pointer;
    color: var(--grey);
    transition: color 0.2s ease;
    line-height: 1;
}

.checkout-close:hover {
    color: var(--black);
}

.checkout-title {
    font-family: 'Oswald', sans-serif;
    font-size: 1.5rem;
    letter-spacing: 3px;
    margin-bottom: 20px;
}

.checkout-order-summary {
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--light-grey);
}

.checkout-order-summary h3 {
    font-family: 'Oswald', sans-serif;
    font-size: 0.9rem;
    letter-spacing: 2px;
    color: var(--grey);
    margin-bottom: 8px;
}

.checkout-summary-item {
    display: flex;
    justify-content: space-between;
    font-size: 0.78rem;
    padding: 3px 0;
    color: var(--black);
}

.checkout-summary-total {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    font-weight: 600;
    padding-top: 8px;
    margin-top: 6px;
    border-top: 1px solid var(--light-grey);
}

.form-group {
    margin-bottom: 12px;
}

.form-group label {
    display: block;
    font-size: 0.7rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--grey);
    margin-bottom: 4px;
}

.form-group input {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--light-grey);
    background-color: var(--off-white);
    font-family: 'Inter', sans-serif;
    font-size: 0.82rem;
    color: var(--black);
    outline: none;
    transition: border-color 0.3s ease;
}

.form-group input:focus {
    border-color: var(--light-blue);
}

.form-row {
    display: flex;
    gap: 12px;
}

.form-row .form-group {
    flex: 1;
}

.form-section-title {
    font-family: 'Oswald', sans-serif;
    font-size: 0.9rem;
    letter-spacing: 2px;
    color: var(--grey);
    margin-bottom: 10px;
    margin-top: 8px;
}

.payment-buttons {
    display: flex;
    gap: 10px;
    margin-top: 12px;
}

.checkout-card-btn,
.checkout-crypto-btn {
    flex: 1;
    padding: 12px 0;
    font-family: 'Inter', sans-serif;
    font-size: 0.78rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 2px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.checkout-card-btn {
    background-color: var(--light-blue);
    color: var(--white);
    border: none;
}

.checkout-card-btn:hover {
    background-color: #6fb8e6;
}

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

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

.checkout-card-btn:disabled,
.checkout-crypto-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* --- Confirmation Message --- */
.checkout-confirmation {
    display: none;
    text-align: center;
    padding: 30px 0;
}

.checkout-confirmation.active {
    display: block;
}

.checkout-confirmation h2 {
    font-family: 'Oswald', sans-serif;
    font-size: 1.5rem;
    letter-spacing: 3px;
    margin-bottom: 12px;
}

.checkout-confirmation p {
    font-size: 0.82rem;
    color: var(--grey);
    line-height: 1.5;
    margin-bottom: 6px;
}

.checkout-confirmation .order-number {
    font-weight: 600;
    color: var(--black);
    font-size: 0.95rem;
}

/* ============================================
   ABOUT PAGE
   ============================================ */
.about-page {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 30px var(--page-padding) 25px;
    overflow: hidden;
}

.about-header {
    text-align: center;
    margin-bottom: 25px;
    flex-shrink: 0;
}

.about-header h1 {
     font-family: 'Oswald', sans-serif;
     font-size: 2.5rem;
     font-weight: 300;
     letter-spacing: 4px;
     margin-bottom: 10px;
 }

.about-header p {
    font-size: 0.82rem;
    color: var(--grey);
    line-height: 1.6;
    max-width: 650px;
    margin: 0 auto;
}

.about-body {
    flex: 1;
    display: flex;
    gap: 50px;
    max-width: 1100px;
    margin: 0 auto;
    width: 100%;
}

.about-left {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.about-right {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.about-section-title {
    font-family: 'Oswald', sans-serif;
    font-size: 1.3rem;
    letter-spacing: 2px;
    margin-bottom: 15px;
}

.values {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.value-item {
    padding: 12px 18px;
    border-left: 2px solid var(--light-blue);
}

.value-item h3 {
    font-family: 'Oswald', sans-serif;
    font-size: 0.95rem;
    letter-spacing: 2px;
    margin-bottom: 3px;
}

.value-item p {
    font-size: 0.78rem;
    color: var(--grey);
    line-height: 1.4;
}

.certificates-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.certificate-card {
    border: 1px solid var(--light-grey);
    background-color: var(--white);
    padding: 22px 18px;
    text-align: center;
    transition: border-color 0.3s ease;
}

.certificate-card:hover {
    border-color: var(--light-blue);
}

.certificate-card-title {
    font-family: 'Oswald', sans-serif;
    font-size: 0.95rem;
    letter-spacing: 2px;
    margin-bottom: 4px;
}

.certificate-card-text {
    font-size: 0.72rem;
    color: var(--grey);
    line-height: 1.3;
}

/* ============================================
   SUCCESS PAGE
   ============================================ */
.success-page {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 0 var(--page-padding);
}

.success-content {
    text-align: center;
}

.success-title {
    font-family: 'Oswald', sans-serif;
    font-size: 2.5rem;
    letter-spacing: 4px;
    margin-bottom: 10px;
}

.success-order-number {
    font-weight: 600;
    font-size: 1rem;
    color: var(--black);
    margin-bottom: 20px;
}

.success-text {
    font-size: 0.85rem;
    color: var(--grey);
    line-height: 1.6;
    margin-bottom: 8px;
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

.success-btn {
    display: inline-block;
    padding: 12px 36px;
    background-color: var(--light-blue);
    color: var(--white);
    font-family: 'Inter', sans-serif;
    font-size: 0.8rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-top: 25px;
    transition: background-color 0.3s ease;
}

.success-btn:hover {
    background-color: #6fb8e6;
}

/* ============================================
   DISCLAIMER MODAL
   ============================================ */
.disclaimer-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(26, 26, 26, 0.6);
    z-index: 500;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.disclaimer-overlay.active {
    display: flex;
}

.disclaimer-modal {
    background-color: var(--white);
    border: 1px solid var(--light-grey);
    padding: 35px 35px 30px;
    max-width: 560px;
    width: 100%;
    max-height: 85vh;
    overflow-y: auto;
}

.disclaimer-logo {
    font-family: 'Oswald', sans-serif;
    font-size: 1.8rem;
    letter-spacing: 3px;
    text-align: center;
    margin-bottom: 25px;
}

.disclaimer-section {
    margin-bottom: 20px;
}

.disclaimer-heading {
    font-family: 'Oswald', sans-serif;
    font-size: 0.9rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--black);
    margin-bottom: 10px;
}

.disclaimer-list {
    list-style: none;
    padding: 0;
}

.disclaimer-list li {
    font-size: 0.78rem;
    color: var(--grey);
    line-height: 1.5;
    padding: 4px 0 4px 12px;
    border-left: 2px solid var(--light-blue);
    margin-bottom: 6px;
}

.disclaimer-text {
    font-size: 0.78rem;
    color: var(--grey);
    line-height: 1.6;
    margin-bottom: 8px;
}

.disclaimer-acknowledge {
    border-top: 1px solid var(--light-grey);
    padding-top: 18px;
    margin-top: 20px;
    margin-bottom: 18px;
}

.disclaimer-checkbox-label {
    display: flex;
    gap: 10px;
    align-items: flex-start;
    cursor: pointer;
    font-size: 0.75rem;
    color: var(--black);
    line-height: 1.5;
}

.disclaimer-checkbox-label input[type="checkbox"] {
    margin-top: 3px;
    flex-shrink: 0;
    accent-color: var(--light-blue);
}

.disclaimer-btn {
    width: 100%;
    padding: 12px 0;
    background-color: var(--light-blue);
    color: var(--white);
    font-family: 'Inter', sans-serif;
    font-size: 0.8rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 2px;
    border: none;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.disclaimer-btn:hover:not(:disabled) {
    background-color: #6fb8e6;
}

.disclaimer-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* ============================================
   FOOTER (minimal)
   ============================================ */
.footer {
    padding: 12px var(--page-padding);
    text-align: center;
    flex-shrink: 0;
}

.footer-disclaimer {
    font-size: 0.68rem;
    color: var(--grey);
    letter-spacing: 1px;
    margin-bottom: 4px;
}

.footer p:last-child {
    font-size: 0.68rem;
    color: var(--light-grey);
    letter-spacing: 1px;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
    :root {
        --page-padding: 40px;
    }

    .header-logo {
        font-size: 1.8rem;
    }

    .cart {
        right: 40px;
        width: 220px;
    }

    .features {
        gap: 30px;
    }

    .about-body {
        gap: 30px;
    }
}

@media (max-width: 768px) {
    :root {
        --page-padding: 25px;
    }

    html, body {
        overflow: auto;
    }

    .site-header {
        padding-top: 20px;
    }

    .header-logo {
        font-size: 1.6rem;
    }

    .nav {
        gap: 25px;
    }

    .nav a {
        font-size: 0.72rem;
    }

    .hero-tagline {
        font-size: 1rem;
        letter-spacing: 3px;
    }

    .features {
        flex-direction: column;
        gap: 15px;
        padding: 20px 25px 25px;
    }

    .products-container {
        flex-direction: column;
        align-items: center;
        gap: 15px;
    }

    .product-card {
        width: 100%;
        max-width: 280px;
        padding: 20px;
    }

    .cart {
        position: fixed;
        top: auto;
        bottom: 0;
        left: 0;
        right: 0;
        width: 100%;
        max-height: 35vh;
        background-color: var(--white);
        border-top: 1px solid var(--light-grey);
        padding: 15px 25px;
        box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.05);
    }

    .checkout-modal {
        padding: 25px 20px;
        max-width: 100%;
        height: 100%;
        max-height: 100%;
    }

    .form-row {
        flex-direction: column;
        gap: 0;
    }

    .about-body {
        flex-direction: column;
        gap: 25px;
    }

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

    .page-title {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .header-logo {
        font-size: 1.3rem;
    }

    .hero-tagline {
        font-size: 0.85rem;
        letter-spacing: 2px;
    }

    .nav {
        gap: 15px;
    }

    .nav a {
        font-size: 0.65rem;
        letter-spacing: 1px;
    }
}