:root {
    --primary: #059669;
    --primary-dark: #064e3b;
    --primary-light: #d1fae5;
    --accent: #10b981;
    --bg-app: #f8fafc;
    --card-bg: #ffffff;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --radius-lg: 16px;
    --radius-md: 12px;
    --shadow-premium: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    background: var(--bg-app);
    color: var(--text-main);
    line-height: 1.6;
    padding: 20px 10px;
    min-height: 100vh;
}

.app-container {
    max-width: 600px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 30px;
}

.logo {
    margin-bottom: 15px;
}

.logo-image {
    height: 60px;
    object-fit: contain;
}

.logo-image-small {
    height: 30px;
    object-fit: contain;
}

header h1 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-dark);
    margin-bottom: 5px;
}

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

/* Tabs */
.tabs-container {
    margin-bottom: 25px;
    padding-bottom: 10px; /* Space for scroll hidden indicator if any */
}

/* Tabs Navigation */
.tabs-navigation {
    display: flex;
    align-items: center;
    gap: 5px;
    position: relative;
}

.nav-btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: white;
    color: var(--primary-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    flex-shrink: 0;
    transition: var(--transition);
    z-index: 10;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.nav-btn:hover {
    background: var(--primary-light);
    border-color: var(--primary);
}

.nav-btn i {
    width: 18px;
    height: 18px;
}

.tabs-scroll {
    display: flex;
    gap: 12px;
    overflow-x: auto;
    padding: 10px 2px;
    scrollbar-width: none;
    -ms-overflow-style: none;
    -webkit-overflow-scrolling: touch;
    scroll-behavior: smooth;
    flex: 1;
}

.tab-btn {
    padding: 10px 18px;
    border-radius: 50px;
    border: 1px solid var(--border);
    background: var(--card-bg);
    color: var(--text-muted);
    font-weight: 500;
    cursor: pointer;
    white-space: nowrap;
    transition: var(--transition);
    font-size: 0.9rem;
    flex-shrink: 0; /* Prevent squeezing text */
}

.tab-btn.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    box-shadow: 0 4px 12px rgba(5, 150, 105, 0.2);
}

/* Cards */
.card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: 20px;
    margin-bottom: 25px;
    border: 1px solid rgba(226, 232, 240, 0.8);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.shadow-premium {
    box-shadow: var(--shadow-premium);
}

/* Config Section */
.config-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

@media (max-width: 480px) {
    .config-grid {
        grid-template-columns: 1fr;
    }
}

.input-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    font-size: 0.9rem;
    color: var(--primary-dark);
}

.input-with-icon {
    position: relative;
    display: flex;
    align-items: center;
}

.input-with-icon i {
    position: absolute;
    left: 15px;
    color: var(--primary);
    width: 18px;
    height: 18px;
}

.input-with-icon input {
    width: 100%;
    padding: 12px 15px 12px 45px;
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    outline: none;
    transition: var(--transition);
}

.input-with-icon input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px var(--primary-light);
}

/* Segmented Control */
.segmented-control {
    display: flex;
    background: #f1f5f9;
    padding: 4px;
    border-radius: var(--radius-md);
    position: relative;
    user-select: none;
    border: 1px solid var(--border);
}

.segmented-control input {
    display: none;
}

.segment-btn {
    flex: 1;
    text-align: center;
    padding: 10px;
    cursor: pointer;
    z-index: 2;
    transition: var(--transition);
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.segment-btn i {
    width: 18px;
    height: 18px;
}

.selection-slider {
    position: absolute;
    top: 4px;
    left: 4px;
    width: calc(50% - 4px);
    height: calc(100% - 8px);
    background: var(--primary);
    border-radius: calc(var(--radius-md) - 4px);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1;
    box-shadow: 0 2px 8px rgba(5, 150, 105, 0.2);
}

#indoor:checked ~ .selection-slider {
    transform: translateX(0);
}

#outdoor:checked ~ .selection-slider {
    transform: translateX(100%);
}

#indoor:checked ~ label[for="indoor"],
#outdoor:checked ~ label[for="outdoor"] {
    color: white;
}

.input-group.full-width {
    grid-column: 1 / -1;
}

/* Process Display */
.process-section {
    margin-top: 25px;
}

.section-title {
    font-size: 1.15rem;
    margin-bottom: 20px;
    color: var(--primary-dark);
    display: flex;
    align-items: center;
    gap: 10px;
}

.layers-timeline {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 30px;
}

.step-card {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 12px 20px;
    background: white;
    border-radius: var(--radius-md);
    border-left: 5px solid var(--primary);
    box-shadow: 0 2px 4px rgba(0,0,0,0.03);
}

.step-num {
    background: var(--primary-light);
    color: var(--primary-dark);
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-weight: 700;
    font-size: 0.8rem;
}

/* Layer Control UI */
.layer-control {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-left: auto;
    background: #f1f5f9;
    padding: 5px;
    border-radius: 50px;
}

.layer-btn {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    border: none;
    background: white;
    color: var(--primary-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: var(--transition);
}

.layer-btn:hover {
    background: var(--primary);
    color: white;
}

.layer-btn i {
    width: 16px;
    height: 16px;
}

.layer-count {
    font-size: 0.85rem;
    font-weight: 700;
    min-width: 50px;
    text-align: center;
    color: var(--primary-dark);
}

.step-body {
    flex: 1;
}

/* Result Card Modern */
.results-card {
    background: linear-gradient(to bottom, #ffffff, #f1f5f9);
    border: none;
    overflow: hidden;
}

.result-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    border-bottom: 2px dashed var(--border);
    padding-bottom: 15px;
}

.result-title {
    font-weight: 700;
    color: var(--primary-dark);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-size: 1rem;
}

.result-summary {
    background: var(--primary-dark);
    color: white;
    padding: 10px 20px;
    border-radius: var(--radius-md);
    margin-bottom: 20px;
    text-align: center;
    font-weight: 500;
}

.results-breakdown {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-bottom: 25px;
}

.breakdown-item {
    padding: 15px;
    background: rgba(255,255,255,0.7);
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
}

.item-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 5px;
}

.item-name {
    font-weight: 600;
    font-size: 0.95rem;
}

.item-qty {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.item-price {
    font-weight: 600;
    color: var(--primary-dark);
}

.item-details {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px solid rgba(0,0,0,0.05);
}

.tag {
    font-size: 0.75rem;
    background: #f1f5f9;
    padding: 2px 8px;
    border-radius: 4px;
    color: var(--text-muted);
}

/* Total Section */
.total-section {
    padding: 20px;
    background: #064e3b;
    color: white;
    border-radius: var(--radius-md);
}

.total-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.main-total {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 5px;
}

.main-total .price {
    font-size: 1.6rem;
    font-weight: 800;
    color: #34d399;
}

.unit-total {
    font-size: 0.9rem;
    opacity: 0.9;
}

.note-section {
    margin-top: 15px;
    font-size: 0.75rem;
    color: var(--text-muted);
    font-style: italic;
    text-align: center;
}

.result-footer {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 2px dashed var(--border);
}

.qr-section {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
}

.qr-image {
    width: 90px;
    height: 90px;
    border: 1px solid var(--border);
    padding: 5px;
    background: white;
    border-radius: 8px;
}

.qr-text {
    text-align: left;
}

.qr-title {
    font-size: 0.85rem;
    font-weight: 800;
    color: var(--primary-dark);
    margin-bottom: 2px !important;
}

.qr-url {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 2px !important;
}

.qr-hotline {
    font-size: 0.85rem;
    color: var(--text-main);
    font-weight: 500;
}

/* Response for small screens */
@media (max-width: 400px) {
    .qr-section {
        flex-direction: column;
        text-align: center;
    }
    .qr-text {
        text-align: center;
    }
}

/* Buttons */
.action-buttons {
    display: flex;
    gap: 15px;
    margin-bottom: 40px;
}

.btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 14px;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: var(--transition);
}

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

.btn-primary:hover {
    background: #022c22;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

footer {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
    padding-bottom: 20px;
}