/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-primary: #60a5fa;
    --color-primary-dark: #3b82f6;
    --color-primary-glow: rgba(96, 165, 250, 0.15);
    --color-success: #34d399;
    --color-text: #f3f4f6;
    --color-text-light: #9ca3af;
    --color-border: #374151;
    --color-bg: #1f2937;
    --color-bg-secondary: #111827;
    --color-highlight: #1e3a5f;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --border-radius: 0.75rem;
    --transition: all 0.2s ease;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--color-text);
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
    min-height: 100vh;
    padding: var(--spacing-md);
}

.container {
    max-width: 900px;
    margin: 0 auto;
    background: var(--color-bg);
    border-radius: var(--border-radius);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 10px 10px -5px rgba(0, 0, 0, 0.3);
    border: 1px solid var(--color-border);
    padding: var(--spacing-xl);
}

/* Header */
header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

h1 {
    font-size: 2.5rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.subtitle {
    color: var(--color-text-light);
    font-size: 1.125rem;
}

h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

/* Calculator Section */
.calculator {
    margin-bottom: var(--spacing-xl);
}

.calculator-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

@media (min-width: 640px) {
    .calculator-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.input-group {
    background: var(--color-bg-secondary);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.input-group.highlight {
    background: var(--color-highlight);
    border: 2px solid var(--color-primary);
}

.input-group:focus-within {
    background: var(--color-highlight);
    transform: translateY(-2px);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 0 20px var(--color-primary-glow);
}

.input-group label {
    display: block;
    font-weight: 500;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xs);
}

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

.currency-symbol {
    position: absolute;
    left: var(--spacing-sm);
    font-size: 1.5rem;
    color: var(--color-text-light);
    pointer-events: none;
}

.percent-symbol {
    position: absolute;
    right: var(--spacing-sm);
    font-size: 1.5rem;
    color: var(--color-text-light);
    pointer-events: none;
}

input[type="number"] {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-lg) var(--spacing-sm) 2.5rem;
    font-size: 1.5rem;
    font-weight: 500;
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius);
    background: var(--color-bg);
    color: var(--color-text);
    transition: var(--transition);
    font-family: inherit;
}

#margin {
    padding-right: 2.5rem;
    padding-left: var(--spacing-sm);
}

input[type="number"]:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-glow), 0 0 20px var(--color-primary-glow);
}

input[type="number"]::placeholder {
    color: #4b5563;
}

/* Remove spinner buttons */
input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

input[type="number"] {
    -moz-appearance: textfield;
}

.helper-text {
    display: block;
    font-size: 0.75rem;
    color: var(--color-text-light);
    margin-top: var(--spacing-xs);
}

/* Markup Display */
.markup-display {
    background: var(--color-bg-secondary);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.markup-label {
    font-weight: 500;
    color: var(--color-text-light);
}

.markup-value {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-success);
}

.markup-helper {
    font-size: 0.75rem;
    color: var(--color-text-light);
}

/* Formulas Section */
.formulas {
    margin-bottom: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    border-top: 2px solid var(--color-border);
}

.formula-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
}

@media (min-width: 640px) {
    .formula-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.formula-card {
    background: var(--color-bg-secondary);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    text-align: center;
}

.formula-title {
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.formula-text {
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
    color: var(--color-text);
}

/* Explainer Section */
.explainer {
    margin-bottom: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    border-top: 2px solid var(--color-border);
}

.explainer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

@media (min-width: 640px) {
    .explainer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.explainer-card {
    background: var(--color-bg-secondary);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
}

.explainer-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.explainer-card p {
    font-size: 0.875rem;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.explainer-card p:last-child {
    margin-bottom: 0;
}

.example {
    font-size: 0.8125rem;
    color: var(--color-text-light);
    font-style: italic;
}

.key-insight {
    background: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    color: white;
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    text-align: center;
    font-size: 0.9375rem;
    box-shadow: 0 0 30px rgba(59, 130, 246, 0.3);
}

/* Action Buttons & Currency Selector */
.action-buttons {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
    align-items: center;
}

.btn {
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--border-radius);
    border: 2px solid var(--color-border);
    background: var(--color-bg-secondary);
    color: var(--color-text);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: inherit;
}

.btn:hover {
    background: var(--color-highlight);
    border-color: var(--color-primary);
    transform: translateY(-1px);
}

.btn-icon {
    font-size: 1rem;
}

.currency-select {
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--border-radius);
    border: 2px solid var(--color-border);
    background: var(--color-bg-secondary);
    color: var(--color-text);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
    margin-left: auto;
}

.currency-select:hover,
.currency-select:focus {
    border-color: var(--color-primary);
    outline: none;
}

/* Quick Presets */
.presets {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
    align-items: center;
    padding: var(--spacing-md);
    background: var(--color-bg-secondary);
    border-radius: var(--border-radius);
}

.presets-label {
    font-weight: 500;
    color: var(--color-text-light);
    font-size: 0.875rem;
}

.preset-btn {
    padding: 0.4rem var(--spacing-sm);
    border-radius: 0.5rem;
    border: 2px solid var(--color-primary);
    background: transparent;
    color: var(--color-primary);
    font-size: 0.8125rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.preset-btn:hover {
    background: var(--color-primary);
    color: white;
    transform: translateY(-1px);
}

/* Volume Discount Calculator */
.volume-calculator {
    margin-bottom: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    border-top: 2px solid var(--color-border);
}

.section-subtitle {
    color: var(--color-text-light);
    font-size: 0.9375rem;
    margin-bottom: var(--spacing-md);
}

.volume-inputs {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

@media (min-width: 640px) {
    .volume-inputs {
        grid-template-columns: repeat(2, 1fr);
    }
}

.input-group-inline {
    background: var(--color-bg-secondary);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
}

.input-group-inline label {
    display: block;
    font-weight: 500;
    font-size: 0.875rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xs);
}

.input-wrapper-inline {
    position: relative;
    display: flex;
    align-items: center;
}

.currency-symbol-inline {
    position: absolute;
    left: var(--spacing-sm);
    font-size: 1.25rem;
    color: var(--color-text-light);
    pointer-events: none;
}

.input-group-inline input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-sm) var(--spacing-sm) 2rem;
    font-size: 1.25rem;
    font-weight: 500;
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius);
    background: var(--color-bg);
    color: var(--color-text);
    transition: var(--transition);
    font-family: inherit;
}

.input-group-inline input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-glow);
}

.volume-tiers {
    background: var(--color-bg-secondary);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-md);
    overflow-x: auto;
}

.tier-row {
    display: grid;
    grid-template-columns: 90px 65px 45px 1fr;
    gap: 0.5rem;
    align-items: center;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--color-border);
}

@media (min-width: 640px) {
    .tier-row {
        grid-template-columns: 110px 75px 50px 1fr;
        gap: var(--spacing-sm);
    }
}

.tier-row:last-child {
    border-bottom: none;
}

.tier-label {
    font-weight: 500;
    font-size: 0.8125rem;
    color: var(--color-text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

@media (min-width: 640px) {
    .tier-label {
        font-size: 0.875rem;
    }
}

input.tier-discount {
    /* Reset everything */
    all: unset;

    /* Basic display */
    display: block;
    width: 100%;
    height: auto;

    /* Sizing */
    min-height: 38px;
    padding: 8px 10px;

    /* Typography */
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 14px;
    font-weight: 600;
    line-height: 1.4;
    text-align: center;

    /* Colors - explicit values */
    color: #f3f4f6;
    background-color: #1f2937;

    /* Border */
    border: 2px solid #374151;
    border-radius: 8px;

    /* Other */
    box-sizing: border-box;
    cursor: text;
}

input.tier-discount:focus {
    outline: 2px solid #60a5fa;
    outline-offset: 2px;
    border-color: #60a5fa;
}

/* Remove spinner buttons */
input.tier-discount::-webkit-inner-spin-button,
input.tier-discount::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
    display: none;
}

input.tier-discount {
    -moz-appearance: textfield;
}

.tier-row > span:nth-child(3) {
    font-size: 0.75rem;
    color: var(--color-text-light);
    white-space: nowrap;
}

@media (min-width: 640px) {
    .tier-row > span:nth-child(3) {
        font-size: 0.8125rem;
    }
}

.tier-price {
    font-weight: 600;
    font-size: 0.8125rem;
    color: var(--color-primary);
    text-align: right;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

@media (min-width: 640px) {
    .tier-price {
        font-size: 0.875rem;
    }
}

.volume-result {
    background: var(--color-highlight);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    border: 2px solid var(--color-primary);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

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

.result-label {
    font-weight: 500;
    color: var(--color-text-light);
}

.result-value {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
}

.highlight-value {
    font-size: 1.5rem;
    color: var(--color-primary);
}

.success-value {
    color: var(--color-success);
}

/* Print Styles */
@media print {
    @page {
        size: letter;
        margin: 0.5in;
    }

    body,
    .container {
        color: #000 !important;
        background: white !important;
        box-shadow: none !important;
    }

    h1, h2, h3, p, span:not(.currency-symbol):not(.percent-symbol) {
        color: #000 !important;
    }

    /* Keep inputs styled normally even in print */
    input {
        color: #000 !important;
        background: white !important;
        border: 1px solid #000 !important;
    }

    body {
        background: white !important;
        padding: 0;
        margin: 0;
    }

    .container {
        max-width: 100%;
        padding: 0;
        box-shadow: none;
        border: none;
        background: white !important;
    }

    /* Hide interactive elements */
    .action-buttons,
    .presets,
    .ad-container,
    footer,
    .markup-display,
    .formulas,
    .explainer,
    .volume-calculator {
        display: none !important;
    }

    /* Show only the header and calculator */
    header {
        margin-bottom: 20px;
        text-align: center;
        border-bottom: 2px solid #000;
        padding-bottom: 10px;
    }

    h1 {
        font-size: 24pt;
        margin-bottom: 5px;
        color: #000 !important;
    }

    .subtitle {
        font-size: 10pt;
        color: #666 !important;
    }

    .calculator {
        page-break-inside: avoid;
        margin-bottom: 0;
    }

    /* Compact grid for print */
    .calculator-grid {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
        margin-bottom: 20px;
    }

    .input-group {
        background: white !important;
        border: 2px solid #000 !important;
        padding: 12px;
        border-radius: 8px;
    }

    .input-group.highlight {
        border: 3px solid #000 !important;
        background: #f5f5f5 !important;
    }

    .input-group label {
        font-size: 9pt;
        font-weight: bold;
        color: #000 !important;
        text-transform: uppercase;
        margin-bottom: 5px;
    }

    .helper-text {
        font-size: 8pt;
        color: #666 !important;
        margin-top: 3px;
    }

    .input-wrapper {
        margin: 5px 0;
    }

    input[type="number"] {
        width: 100%;
        padding: 8px 10px 8px 30px;
        font-size: 16pt;
        font-weight: bold;
        border: none !important;
        background: transparent !important;
        color: #000 !important;
    }

    #margin {
        padding-left: 10px;
        padding-right: 30px;
    }

    .currency-symbol,
    .percent-symbol {
        font-size: 14pt;
        color: #000 !important;
        font-weight: bold;
    }

    /* Add a print summary section */
    .calculator::after {
        content: "";
        display: block;
        margin-top: 30px;
        padding-top: 20px;
        border-top: 2px solid #000;
    }

    /* Add calculation summary */
    body::after {
        content: "Margin: " attr(data-margin) " | Markup: " attr(data-markup) " | Generated: " attr(data-date);
        display: block;
        text-align: center;
        font-size: 9pt;
        color: #666 !important;
        margin-top: 20px;
        padding-top: 20px;
        border-top: 1px solid #ccc;
    }

    /* Print info box */
    .print-info {
        display: block !important;
        margin-top: 30px;
        padding: 15px;
        border: 2px solid #000;
        border-radius: 8px;
        background: #f9f9f9 !important;
    }

    .print-info h3 {
        font-size: 11pt;
        margin-bottom: 10px;
        color: #000 !important;
    }

    .print-info-grid {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }

    .print-info-item {
        font-size: 9pt;
        padding: 8px;
        border-left: 3px solid #000;
        background: white !important;
    }

    .print-info-label {
        font-weight: bold;
        color: #000 !important;
        display: block;
        margin-bottom: 3px;
    }

    .print-info-value {
        font-size: 12pt;
        color: #000 !important;
        font-weight: bold;
    }

    /* Footer info */
    .print-footer {
        display: block !important;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        text-align: center;
        font-size: 8pt;
        color: #999 !important;
        padding: 10px;
        border-top: 1px solid #ddd;
    }
}

/* Ad Container */
.ad-container {
    margin: var(--spacing-xl) 0;
    text-align: center;
}

.ad-placeholder {
    background: var(--color-bg-secondary);
    border: 2px dashed var(--color-border);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    color: var(--color-text-light);
    font-size: 0.875rem;
}

/* Footer */
footer {
    text-align: center;
    padding: var(--spacing-lg) 0;
    color: var(--color-text-light);
    font-size: 0.875rem;
}

footer a {
    color: var(--color-primary);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* Mobile optimizations */
@media (max-width: 639px) {
    body {
        padding: var(--spacing-sm);
    }

    .container {
        padding: var(--spacing-md);
    }

    h1 {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    input[type="number"] {
        font-size: 1.25rem;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation: none !important;
        transition: none !important;
    }
}