:root {
    --primary-navy: #FAF8F5; /* Cozy Off-White */
    --secondary-navy: #F3EFE9; /* Cozy Beige/Cream */
    --accent-gold: #C5A059; /* Brand Gold */
    --accent-gold-light: #DFBE7B;
    --accent-green: #D49B24; /* Deep Sage Green */
    --accent-green-light: #1A365D;
    --text-white: #0B192C; /* Dark Olive text */
    --text-gray: #334155; /* Gray Green */
    --glass-bg: rgba(255, 255, 255, 0.75); /* White card backdrop */
    --glass-border: rgba(11, 25, 44, 0.15); /* Sage Green border */
    --shadow-premium: 0 10px 30px rgba(11, 25, 44, 0.06);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Noto Sans Thai', 'Outfit', sans-serif;
}

body {
    background-color: var(--primary-navy);
    color: var(--text-white);
    line-height: 1.6;
    overflow-x: hidden;
    background-image: radial-gradient(circle at 15% 15%, rgba(11, 25, 44, 0.08) 0%, transparent 55%),
                      radial-gradient(circle at 85% 85%, rgba(197, 160, 89, 0.08) 0%, transparent 55%);
    min-height: 100vh;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    padding: 2.5rem 1.25rem;
}

/* Header Section */
header {
    text-align: center;
    margin-bottom: 2.5rem;
    animation: fadeInDown 0.8s ease-out;
}

.header-logo-container {
    display: flex;
    justify-content: center;
    margin-bottom: 1rem;
}

.header-logo {
    max-height: 60px;
    object-fit: contain;
    filter: drop-shadow(0 4px 10px rgba(0, 0, 0, 0.3));
}

h1 {
    font-size: 1.85rem;
    margin-bottom: 0.75rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--text-white) 30%, var(--accent-gold-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    color: var(--text-gray);
    font-size: 0.95rem;
    font-weight: 500;
}

/* Vivi Assistant Card */
.vivi-card {
    display: flex;
    gap: 16px;
    background: linear-gradient(135deg, rgba(76, 175, 80, 0.08) 0%, rgba(197, 160, 89, 0.04) 100%);
    border: 1px solid rgba(76, 175, 80, 0.2);
    border-radius: 24px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    align-items: flex-start;
    backdrop-filter: blur(12px);
    box-shadow: var(--shadow-premium);
    animation: fadeIn 0.8s ease-out;
}

.vivi-avatar-container {
    position: relative;
    flex-shrink: 0;
}

.vivi-avatar {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: radial-gradient(circle, var(--secondary-navy) 60%, var(--accent-gold) 100%);
    border: 2px solid var(--accent-green);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: 6px;
}

.vivi-avatar img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.online-indicator {
    position: absolute;
    bottom: 2px;
    right: 2px;
    width: 12px;
    height: 12px;
    background-color: #47ff84;
    border: 2px solid var(--primary-navy);
    border-radius: 50%;
    animation: pulse-green 2s infinite;
}

@keyframes pulse-green {
    0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(71, 255, 132, 0.7); }
    70% { transform: scale(1); box-shadow: 0 0 0 6px rgba(71, 255, 132, 0); }
    100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(71, 255, 132, 0); }
}

.vivi-speech-bubble {
    flex: 1;
}

.vivi-badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    background: rgba(76, 175, 80, 0.15);
    color: var(--accent-green-light);
    padding: 4px 10px;
    border-radius: 100px;
    font-size: 0.72rem;
    font-weight: 700;
    margin-bottom: 8px;
    border: 1px solid rgba(76, 175, 80, 0.3);
}

.vivi-speech-bubble h3 {
    font-size: 1.1rem;
    color: var(--text-white);
    margin-bottom: 4px;
    font-family: 'Outfit', 'Noto Sans Thai', sans-serif;
}

.vivi-speech-bubble p {
    font-size: 0.88rem;
    color: var(--text-gray);
    line-height: 1.55;
}

/* Card Style */
.card {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.06) 0%, rgba(255, 255, 255, 0.01) 100%);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: 24px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.15), var(--shadow-premium);
    transition: var(--transition);
}

.card:hover {
    border-color: rgba(46, 204, 113, 0.3);
    transform: translateY(-4px);
    box-shadow: inset 0 1px 1.5px rgba(255, 255, 255, 0.22), 0 20px 45px rgba(46, 204, 113, 0.1);
}

h2 {
    color: var(--accent-gold);
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: 'Outfit', 'Noto Sans Thai', sans-serif;
    font-weight: 700;
}

.text-gradient {
    background: linear-gradient(135deg, var(--accent-gold-light), var(--accent-green-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.text-gold {
    color: var(--accent-gold-light);
}

/* Calculator Styles */
.calc-group {
    margin-bottom: 1.25rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-gray);
    font-size: 0.88rem;
    font-weight: 600;
}

/* Custom Dropdown select */
.select-wrapper {
    position: relative;
    width: 100%;
}

select {
    width: 100%;
    background: var(--secondary-navy);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 1rem 1.25rem;
    color: var(--text-white);
    font-size: 0.95rem;
    font-weight: 500;
    outline: none;
    appearance: none;
    transition: var(--transition);
    cursor: pointer;
}

select:focus {
    border-color: var(--accent-green);
    box-shadow: 0 0 15px rgba(76, 175, 80, 0.15);
}

.select-arrow {
    position: absolute;
    right: 1.25rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--accent-gold-light);
    pointer-events: none;
    font-size: 0.9rem;
    transition: var(--transition);
}

select:focus + .select-arrow {
    transform: translateY(-50%) rotate(180deg);
    color: var(--accent-green-light);
}

/* Input Stepper Wrapper */
.input-wrapper-stepper {
    display: flex;
    align-items: center;
    background: var(--secondary-navy);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    overflow: hidden;
    transition: var(--transition);
}

.input-wrapper-stepper:focus-within {
    border-color: var(--accent-green);
    box-shadow: 0 0 15px rgba(76, 175, 80, 0.15);
}

.stepper-btn {
    background: transparent;
    border: none;
    color: var(--accent-gold-light);
    width: 54px;
    height: 54px;
    font-size: 1.1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.stepper-btn:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-white);
}

.stepper-btn:active {
    transform: scale(0.9);
}

.input-wrapper-stepper input {
    flex: 1;
    background: transparent;
    border: none;
    padding: 0.75rem;
    text-align: center;
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-white);
    outline: none;
    width: 100%;
}

/* Hide default browser spin buttons */
input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}
input[type=number] {
    -moz-appearance: textfield;
}

.input-wrapper-stepper .unit {
    color: var(--text-gray);
    font-weight: 700;
    font-size: 0.95rem;
    padding-right: 16px;
    pointer-events: none;
    white-space: nowrap;
}

/* Calculator Dynamic Layout */
.calculator-display {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-top: 1.5rem;
    background: rgba(0, 0, 0, 0.25);
    padding: 1.25rem;
    border-radius: 20px;
    border: 1px solid var(--glass-border);
    box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.05);
}

.product-preview-container {
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.08) 0%, rgba(255, 255, 255, 0.02) 100%);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 20px;
    padding: 0;
    height: 200px;
    width: 100%;
    overflow: hidden;
    flex-shrink: 0;
    box-shadow: inset 0 1px 2px rgba(255, 255, 255, 0.2), 0 8px 24px rgba(0, 0, 0, 0.35);
}

.product-preview-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    filter: drop-shadow(0 4px 10px rgba(0, 0, 0, 0.4));
    transition: opacity 0.3s ease;
}

@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-6px); }
    100% { transform: translateY(0px); }
}

.result-box {
    background: rgba(197, 160, 89, 0.06);
    border: 1px dashed rgba(197, 160, 89, 0.4);
    border-radius: 16px;
    padding: 1.25rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-height: 100px;
}

.result-value {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--accent-gold-light);
    display: block;
    line-height: 1.2;
    margin: 4px 0;
}

.result-label {
    color: var(--text-gray);
    font-size: 0.85rem;
    font-weight: 600;
}

#packaging-suggestion {
    margin-top: 8px;
    font-size: 0.85rem;
    color: var(--text-white);
    font-weight: 500;
}

/* Tab Pill Container Style */
.tab-pill-container {
    display: flex;
    background: var(--secondary-navy);
    padding: 4px;
    border-radius: 100px;
    border: 1px solid var(--glass-border);
}

.tab-pill-container .tab-btn {
    border-radius: 100px;
    border: none;
    font-weight: 600;
    font-size: 0.82rem;
    padding: 0.6rem 0.4rem;
    color: var(--text-gray);
    background: transparent;
    transition: var(--transition);
    flex: 1 1 0;
    min-width: 0;
    text-overflow: ellipsis;
    white-space: nowrap;
    overflow: hidden;
}

.tab-pill-container .tab-btn.active {
    background: var(--accent-gold);
    color: var(--primary-navy);
    font-weight: 700;
}

/* Standard Tab Buttons for general tabs */
.tabs {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    scrollbar-width: none;
}

.tabs::-webkit-scrollbar {
    display: none;
}

.tab-btn {
    background: var(--secondary-navy);
    border: 1px solid var(--glass-border);
    color: var(--text-gray);
    padding: 0.6rem 1.2rem;
    border-radius: 100px;
    cursor: pointer;
    white-space: nowrap;
    font-size: 0.88rem;
    font-weight: 600;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.tab-btn i {
    font-size: 0.85rem;
}

.tab-btn.active {
    background: var(--accent-green);
    color: var(--primary-navy);
    border-color: var(--accent-green);
    font-weight: 700;
}

.tab-content {
    display: none;
    animation: fadeIn 0.4s ease;
}

.tab-content.active {
    display: block;
}

/* Product Info Block (Visual Side-by-side details) */
.product-info-layout {
    display: flex;
    gap: 20px;
    align-items: center;
}

@media (max-width: 480px) {
    .product-info-layout {
        flex-direction: column;
        text-align: center;
    }
}

.product-info-img-wrapper {
    width: 110px;
    height: 110px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 10px;
}

.product-info-img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    filter: drop-shadow(0 5px 12px rgba(0, 0, 0, 0.3));
}

.product-info-details {
    flex: 1;
    width: 100%;
}

.product-title {
    font-size: 1.1rem;
    color: var(--text-white);
    margin-bottom: 4px;
    font-weight: 700;
}

.product-desc {
    font-size: 0.82rem;
    color: var(--text-gray);
    margin-bottom: 12px;
    line-height: 1.4;
}

.product-pricing-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.price-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(197, 160, 89, 0.06);
    border: 1px solid rgba(197, 160, 89, 0.15);
    padding: 8px 14px;
    border-radius: 12px;
    font-size: 0.88rem;
    transition: var(--transition);
}

.price-item:hover {
    border-color: rgba(197, 160, 89, 0.35);
    background: rgba(197, 160, 89, 0.1);
}

.size-label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-weight: 600;
}

.price-value {
    color: var(--accent-gold-light);
    font-weight: 700;
}

/* Detailed Guide section */
.guide-intro {
    font-size: 0.9rem;
    color: var(--text-gray);
    line-height: 1.6;
    margin-bottom: 1.25rem;
}

.usage-steps-box {
    background: rgba(0, 0, 0, 0.15);
    padding: 1.25rem;
    border-radius: 16px;
    margin-bottom: 1.25rem;
    border: 1px solid var(--glass-border);
}

.usage-steps-box h4 {
    color: var(--accent-gold-light);
    margin-bottom: 8px;
    font-size: 0.95rem;
    font-weight: 700;
}

.usage-steps-box ul {
    padding-left: 18px;
    color: var(--text-white);
    font-size: 0.88rem;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.guide-highlight {
    color: var(--accent-green-light) !important;
    font-weight: 600;
}

.check-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

@media (max-width: 440px) {
    .check-grid {
        grid-template-columns: 1fr;
    }
}

.check-pill {
    background: rgba(76, 175, 80, 0.06);
    border: 1px solid rgba(76, 175, 80, 0.15);
    border-radius: 10px;
    padding: 8px 12px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.82rem;
    font-weight: 500;
    transition: var(--transition);
}

.check-pill:hover {
    border-color: rgba(76, 175, 80, 0.3);
    background: rgba(76, 175, 80, 0.1);
}

.check-pill i {
    color: var(--accent-green-light);
    font-size: 0.9rem;
}

/* Compatibility Grid */
.compat-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 1rem;
}

@media (max-width: 580px) {
    .compat-grid {
        grid-template-columns: 1fr;
    }
}

.compat-col {
    background: rgba(255, 255, 255, 0.015);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 1.25rem;
    transition: var(--transition);
}

.compat-col:hover {
    border-color: rgba(76, 175, 80, 0.15);
    transform: translateY(-2px);
}

.compat-col h3 {
    font-size: 0.95rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
}

.compat-col.suitable h3 {
    color: var(--accent-green-light);
}

.compat-col.unsuitable h3 {
    color: #ff6b6b;
}

.compat-col ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.compat-col li {
    font-size: 0.85rem;
    color: var(--text-white);
    display: flex;
    align-items: center;
    gap: 8px;
}

.compat-col li i {
    width: 18px;
    text-align: center;
    opacity: 0.85;
}

.compat-col.suitable li i {
    color: var(--accent-green-light);
}

.compat-col.unsuitable li i {
    color: #ff6b6b;
}

/* Timeline */
.timeline {
    position: relative;
    padding-left: 20px;
    margin-top: 1rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    bottom: 10px;
    width: 2px;
    background: linear-gradient(to bottom, var(--accent-gold), rgba(197, 160, 89, 0.15));
}

.timeline-step {
    position: relative;
    margin-bottom: 1.75rem;
    padding-left: 18px;
}

.timeline-step:last-child {
    margin-bottom: 0;
}

.timeline-badge {
    position: absolute;
    left: -31px;
    top: 0;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--secondary-navy);
    border: 2px solid var(--accent-gold);
    color: var(--accent-gold-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.72rem;
    z-index: 2;
}

.timeline-panel {
    background: rgba(255, 255, 255, 0.015);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 1.1rem;
}

.timeline-panel h4 {
    color: var(--accent-gold-light);
    font-size: 0.9rem;
    margin-bottom: 0.4rem;
    font-weight: 700;
}

.timeline-panel p {
    font-size: 0.82rem;
    color: var(--text-gray);
    line-height: 1.5;
}

/* Safety Blocks */
.check-item-premium {
    background: rgba(76, 175, 80, 0.03);
    border: 1px solid rgba(76, 175, 80, 0.15);
    border-radius: 16px;
    padding: 1.1rem;
    display: flex;
    align-items: flex-start;
    gap: 12px;
    transition: var(--transition);
}

.check-item-premium:hover {
    border-color: rgba(76, 175, 80, 0.25);
}

.check-item-premium i {
    color: var(--accent-green-light);
    font-size: 1.15rem;
    margin-top: 2px;
}

.warning-item-premium {
    background: rgba(255, 107, 107, 0.03);
    border: 1px solid rgba(255, 107, 107, 0.15);
    border-radius: 16px;
    padding: 1.1rem;
    display: flex;
    align-items: flex-start;
    gap: 12px;
    transition: var(--transition);
}

.warning-item-premium:hover {
    border-color: rgba(255, 107, 107, 0.25);
}

.warning-item-premium i {
    color: #ff6b6b;
    font-size: 1.15rem;
    margin-top: 2px;
}

/* Eco-Tech Brand Message Quote */
.brand-eco-quote {
    background: radial-gradient(circle at 50% 50%, rgba(76, 175, 80, 0.06) 0%, transparent 80%), var(--secondary-navy);
    border: 1px solid rgba(76, 175, 80, 0.18);
    box-shadow: var(--shadow-premium);
    border-radius: 24px;
    padding: 2.2rem 1.75rem;
    margin-bottom: 2rem;
    position: relative;
    overflow: hidden;
    text-align: center;
}

.brand-eco-quote::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--accent-green), transparent);
}

.quote-content {
    position: relative;
    display: inline-block;
    max-width: 90%;
}

.quote-content p {
    font-family: 'Outfit', 'Noto Sans Thai', sans-serif;
    font-size: 0.95rem;
    color: var(--text-white);
    line-height: 1.7;
    font-style: italic;
}

.quote-content strong {
    color: var(--accent-green-light);
}

.quote-content i {
    color: var(--accent-green);
    opacity: 0.22;
    font-size: 1.2rem;
    position: absolute;
}

.quote-content .fa-quote-left {
    top: -10px;
    left: -24px;
}

.quote-content .fa-quote-right {
    bottom: -10px;
    right: -24px;
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem 0 1rem;
    color: var(--text-gray);
    font-size: 0.78rem;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-16px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Mobile Tweaks */
@media (max-width: 480px) {
    .container { padding: 1.75rem 0.75rem; }
    h1 { font-size: 1.6rem; }
    .card { padding: 1.25rem; }
    .brand-eco-quote {
        padding: 1.75rem 1rem;
    }
    .quote-content p {
        font-size: 0.88rem;
    }
    .quote-content .fa-quote-left {
        left: -12px;
        top: -16px;
    }
    .quote-content .fa-quote-right {
        right: -12px;
        bottom: -16px;
    }
}

.en-sub {
    display: block;
    color: var(--text-gray);
    font-size: 0.8rem;
    font-weight: normal;
    font-style: italic;
    margin-top: 2px;
}