:root {
    --color-bg-start: #1E2530;
    --color-bg-end: #2C3542;

    --color-ink: #1F2937;
    --color-ink-soft: #4B5563;
    --color-silver: #D1D5DB;

    --color-summary-start: #2C3542;
    --color-summary-end: #3D4759;
    --color-summary-border: #5A6472;
    --color-summary-border-strong: #707C8C;

    --color-white: #ffffff;
    --color-text-dark: #333333;
    --color-text-muted: #666666;
    --color-text-light: #cccccc;

    --color-card-bg: #f8f9fa;
    --color-border-light: #dddddd;
    --color-border-lighter: #e5e1e1;

    --color-danger: #c0392b;
    --color-danger-hover: #a93226;

    --color-overlay: rgba(0, 0, 0, 0.7);
    --color-spinner-track: #f3f3f3;

    --font-size-xs: 0.9rem;
    --font-size-sm: 0.95rem;
    --font-size-base: 1rem;
    --font-size-label: 0.98rem;
    --font-size-lg: 1.1rem;
    --font-size-xl: 1.2rem;
    --font-size-2xl: 1.3rem;
    --font-size-3xl: 1.5rem;
    --font-size-4xl: 2rem;
}

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

.hidden {
    display: none !important;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    min-height: 100vh;
    background: linear-gradient(180deg, var(--color-bg-start) 0%, var(--color-bg-end) 100%);
}

.container {
    max-width: 1400px;
    padding: 0px 40px 40px 40px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: 20px;
}

@media (max-width: 1200px) {
    .container {
        grid-template-columns: 1fr;
        width: 100%;
        padding: 0px 20px 20px 20px;
    }

    .main-content {
        justify-self: center;
    }

    .price-summary {
        max-width: 850px;
        width: 100%;
        justify-self: center;
    }
}

header {
    max-width: 1400px;
    margin: 40px auto 60px auto;
    padding: 40px 40px 0 40px;
}

@media (max-width: 1200px) {
    header {
        padding-left: 20px;
        padding-right: 20px;
    }

    .header-content {
        max-width: 850px;
        margin: 0 auto;
    }

    .header-content p {
        width: 100%;
    }
}

footer {
    max-width: 1400px;
    margin: 20px auto 0 auto;
    padding: 20px 40px 40px 40px;
    text-align: center;
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

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

.header-text {
    width: 100%;
}

.header-text h1 {
    color: var(--color-white);
    font-size: var(--font-size-4xl);
    margin-bottom: 15px;
}

.subtitle {
    color: var(--color-text-muted);
    font-size: var(--font-size-base);
    width: 70%;
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        text-align: center;
    }

    .subtitle {
        text-align: left;
        padding-bottom: 20px;
    }

    .header-text h1 {
        font-size: var(--font-size-3xl);
    }

    .price-summary {
        max-width: 440px;
    }
}


.main-content {
    display: flex;
    flex-direction: column;
    gap: 20px;
    max-width: 850px;
}

.card {
    background: var(--color-card-bg);
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.card h2 {
    color: var(--color-ink);
    margin-bottom: 20px;
    font-size: var(--font-size-2xl);
    border-bottom: 2px solid var(--color-border-lighter);
    padding-bottom: 10px;
}

.form-group {
    margin-bottom: 15px;
    }

.form-group label {
    display: block;
    margin-bottom: 5px;
    color: var(--color-text-dark);
    font-weight: 600;
    font-size: var(--font-size-label);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--color-border-light);
    border-radius: 5px;
    font-size: var(--font-size-sm);
    font-weight: 400;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-ink);
}

.form-group textarea {
    resize: vertical;
    font-family: inherit;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    column-gap: 25px;
    row-gap: 20px;
    margin-bottom: 15px;
}

.specs-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    column-gap: 25px;
    row-gap: 20px;
    margin-bottom: 15px;
}

.specs-grid .form-group {
    margin-bottom: 0;
}

.specs-grid select,
.specs-grid-3col select,
.specs-grid-3col input[type="number"] {
    max-width: 100%;
}

.specs-grid-2col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    column-gap: 25px;
    row-gap: 20px;
    margin-bottom: 15px;
}

.specs-grid-3col {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    column-gap: 25px;
    row-gap: 20px;
    margin-bottom: 15px;
}


@media (max-width: 768px) {
    .specs-grid {
        grid-template-columns: 1fr;
    }

    .specs-grid-2col {
        grid-template-columns: 1fr;
    }

    .specs-grid-3col {
        grid-template-columns: 1fr 1fr;
    }
}

.quantities-grid,
.accessory-grid,
.finishing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    column-gap: 25px;
    row-gap: 20px;
    margin-bottom: 15px;
}

.quantities-grid .form-group,
.accessory-grid .form-group,
.finishing-grid .form-group {
    margin-bottom: 0;
}

.quantities-grid input,
.accessory-grid input,
.finishing-grid input {
    max-width: 100%;
}

#pinTypeSection,
#flangeTypeSection {
    background: var(--color-card-bg);
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 15px;
    border-left: 4px solid var(--color-ink);
}


/* Price summary sticky sidebar */
.price-summary {
    position: sticky;
    top: 20px;
    height: fit-content;
    background: linear-gradient(135deg, var(--color-summary-start) 0%, var(--color-summary-end) 100%);
    color: var(--color-white);

}

.price-summary h2 {
    color: var(--color-silver);
    border-bottom-color: var(--color-summary-border);
}

.price-breakdown {
    margin-bottom: 20px;
}

.price-row {
    display: flex;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px solid var(--color-summary-border);
}

.price-row span:first-child {
    color: var(--color-text-light);
}

.price-row span:last-child {
    color: var(--color-white);
    font-weight: 600;
}

.price-row.subtotal {
    border-top: 2px solid var(--color-summary-border-strong);
    margin-top: 5px;
    padding-top: 15px;
}

.price-row.total {
    border-top: 3px solid var(--color-silver);
    border-bottom: none;
    margin-top: 5px;
    padding-top: 15px;
    font-size: var(--font-size-xl);
}

.price-row.total span {
    color: var(--color-silver);
    font-weight: bold;
}

.button-group {
    display: flex;
    gap: 10px;
    margin-top: 15px;
}

.btn-primary {
    flex: 1;
    padding: 15px;
    background: var(--color-white);
    color: var(--color-ink);
    border: none;
    border-radius: 6px;
    font-size: var(--font-size-lg);
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-primary:hover {
    background: var(--color-ink);
    color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    flex: 1;
    padding: 15px;
    background: transparent;
    color: var(--color-white);
    border: 2px solid var(--color-white);
    border-radius: 6px;
    font-size: var(--font-size-lg);
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.btn-secondary:active {
    transform: translateY(0);
}

#saveButtons {
    display: flex;
    gap: 10px;
    margin-top: 15px;
    justify-content: flex-end;
}

#deleteCustomerButtons {
    display: flex;
    gap: 10px;
    margin-top: 15px;
    justify-content: flex-end;
}

#deleteContactButtons {
    display: flex;
    gap: 10px;
    margin-top: 15px;
    justify-content: flex-end;
}

.btn-save-customer {
    width: auto;
    padding: 12px 24px;
    background: var(--color-ink);
    color: var(--color-white);
    border: none;
    border-radius: 6px;
    font-size: var(--font-size-xs);
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-save-customer:hover {
    background: var(--color-ink-soft);
    transform: translateY(-2px);
}

.btn-save-customer:active {
    transform: translateY(0);
}

.btn-delete-customer {
    width: auto;
    padding: 12px 24px;
    background: var(--color-danger);
    color: var(--color-white);
    border: none;
    border-radius: 6px;
    font-size: var(--font-size-xs);
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-delete-customer:hover {
    background: var(--color-danger-hover);
    transform: translateY(-2px);
}

.btn-delete-customer:active {
    transform: translateY(0);
}


.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 40px;
    margin-left: 10px;
}

.checkbox-group label {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-size: var(--font-size-base);
    color: var(--color-text-dark);
}

.checkbox-group input[type="checkbox"] {
    width: auto;
    margin-right: 15px;
    cursor: pointer;
}

.loading-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--color-overlay);
    z-index: 9999;
    justify-content: center;
    align-items: center;
}

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

.loading-spinner {
    background: var(--color-white);
    padding: 40px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.spinner {
    border: 4px solid var(--color-spinner-track);
    border-top: 4px solid var(--color-ink);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-spinner p {
    color: var(--color-bg-start);
    font-size: var(--font-size-base);
    font-weight: 600;
    margin: 0;
}

@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    header {
        padding-top: 20px;
        margin-bottom: 20px;
    }

    footer {
        padding: 15px 10px 20px 10px;
    }

    .card {
        padding: 15px;
    }

    .button-group {
        flex-direction: column;
    }

    .quantities-grid,
    .accessory-grid,
    .finishing-grid {
        grid-template-columns: 1fr;
    }

    .price-summary {
        position: static;
    }
}