/* =========================================
   10/10 Professional Calculator Engine Styles
   ========================================= */

/* Root Design Tokens Fallback (Ensures standalone styling consistency) */
:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: rgba(37, 99, 235, 0.08);
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --focus-ring: rgba(37, 99, 235, 0.25);
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.01);
}

/* ==========================================================================
   CSS VARIABLES (AUTOMATIC DARK MODE FOR CALCULATORS)
   ========================================================================== */
@media (prefers-color-scheme: dark) {
    :root {
        --primary: #3b82f6;
        --primary-hover: #60a5fa;
        --primary-light: rgba(59, 130, 246, 0.15);
        --bg-color: #0f172a;
        --card-bg: #1e293b;
        --text-main: #f8fafc;
        --text-muted: #94a3b8;
        --border-color: #334155;
        --focus-ring: rgba(59, 130, 246, 0.35);
        --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
        --shadow-md: 0 10px 25px -5px rgba(0, 0, 0, 0.4), 0 8px 10px -6px rgba(0, 0, 0, 0.2);
    }
}

/* Base Utility Classes */
.hidden {
    display: none !important;
}

/* Page Container */
.calculator-page {
    max-width: 880px;
    margin: 40px auto;
    padding: 0 24px;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    color: var(--text-main);
}

/* Header Section */
.calc-header {
    text-align: center;
    margin-bottom: 40px;
}

.calc-header h1 {
    color: var(--text-main);
    font-size: 2.25rem;
    font-weight: 800;
    letter-spacing: -0.025em;
    margin-bottom: 12px;
    line-height: 1.2;
}

.calc-header p {
    color: var(--text-muted);
    font-size: 1.125rem;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

/* Main Calculator Card */
.calculator-app {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 36px;
    box-shadow: var(--shadow-md);
    margin-bottom: 48px;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

/* Form Grid */
.calc-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.input-group {
    display: flex;
    flex-direction: column;
}

.input-group label {
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-main);
    font-size: 0.925rem;
    letter-spacing: -0.01em;
}

/* Inputs & Selects */
.input-group input, 
.input-group select {
    width: 100%;
    padding: 13px 16px;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    font-size: 1rem;
    background-color: var(--bg-color);
    color: var(--text-main);
    transition: border-color 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
    box-sizing: border-box;
}

.input-group select {
    appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 14px center;
    background-size: 16px;
    padding-right: 40px;
}

.input-group input:hover, 
.input-group select:hover {
    border-color: var(--text-muted);
}

.input-group input:focus, 
.input-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px var(--focus-ring);
    background-color: var(--card-bg);
}

/* Submit Action Button */
.calc-btn {
    grid-column: 1 / -1;
    background: var(--primary);
    color: #ffffff;
    border: none;
    padding: 16px 24px;
    font-size: 1.05rem;
    font-weight: 700;
    border-radius: 10px;
    cursor: pointer;
    transition: background-color 0.2s ease, transform 0.1s ease, box-shadow 0.2s ease;
    margin-top: 12px;
    letter-spacing: 0.01em;
    display: inline-flex;
    justify-content: center;
    align-items: center;
}

.calc-btn:hover {
    background: var(--primary-hover);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

.calc-btn:active {
    transform: scale(0.985);
}

/* Results Output Display */
.calc-results {
    margin-top: 36px;
    padding-top: 32px;
    border-top: 2px dashed var(--border-color);
    animation: fadeUp 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.result-box {
    background: var(--bg-color);
    padding: 22px;
    border-radius: 12px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.result-box h4 {
    color: var(--text-muted);
    font-size: 0.825rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 8px;
}

/* Hero Result Container */
.primary-result {
    margin-bottom: 20px;
    background: var(--primary-light);
    border-color: var(--primary);
}

.primary-result .result-value {
    font-size: 2.75rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1.1;
    letter-spacing: -0.02em;
}

.result-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.result-grid span {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--text-main);
}

/* Status Badges & Indicators */
.status-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 9999px;
    font-size: 1rem;
    font-weight: 700;
}

.status-pass {
    color: #059669;
    background-color: rgba(16, 185, 129, 0.12);
}

.status-warning {
    color: #d97706;
    background-color: rgba(245, 158, 11, 0.12);
}

.status-fail {
    color: #dc2626;
    background-color: rgba(239, 68, 68, 0.12);
}

.status-invalid {
    color: #6b7280;
    background-color: rgba(156, 163, 175, 0.12);
}

.warning-text {
    color: #dc2626;
    font-size: 0.9em;
    font-weight: 600;
}

/* SEO Content & FAQ Section */
.seo-content, .faq-section {
    margin-bottom: 48px;
    line-height: 1.7;
}

.seo-content h2, 
.faq-section h2 {
    color: var(--text-main);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    letter-spacing: -0.02em;
}

.seo-content h3 {
    font-size: 1.2rem;
    color: var(--text-main);
    margin: 28px 0 14px;
}

.seo-content code {
    display: block;
    background: var(--card-bg);
    padding: 16px 20px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    margin: 18px 0;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 0.95rem;
    color: var(--text-main);
    overflow-x: auto;
}

.faq-item {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 22px;
    border-radius: 12px;
    margin-bottom: 16px;
}

.faq-item h3 {
    margin-top: 0;
    margin-bottom: 8px;
    font-size: 1.1rem;
    color: var(--text-main);
}

/* Keyframe Animation */
@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Mobile Responsiveness */
@media (max-width: 640px) {
    .calculator-page {
        margin: 20px auto;
        padding: 0 16px;
    }

    .calculator-app {
        padding: 24px;
        border-radius: 12px;
    }

    .calc-grid, 
    .result-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .calc-header h1 {
        font-size: 1.75rem;
    }

    .primary-result .result-value {
        font-size: 2.25rem;
    }
}

/* =========================================
   Google-Style Instant Search Dropdown
   ========================================= */

.search-container {
    position: relative;
    width: 100%;
    max-width: 600px;
    margin: 0 auto 32px;
}

#search-results {
    position: absolute;
    top: calc(100% + 6px);
    left: 0;
    right: 0;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    z-index: 1000;
    max-height: 380px;
    overflow-y: auto;
    padding: 8px 0;
}

#search-results[hidden] {
    display: none !important;
}

.search-item {
    padding: 12px 18px;
    cursor: pointer;
    transition: background-color 0.15s ease;
}

.search-item:hover,
.search-item.active {
    background-color: var(--bg-color);
}

.search-item strong {
    display: block;
    font-size: 0.95rem;
    color: var(--text-main);
    margin-bottom: 2px;
}

.search-item p {
    margin: 0;
    font-size: 0.85rem;
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.search-item mark {
    background-color: var(--primary-light);
    color: var(--primary);
    font-weight: 600;
    padding: 0 2px;
    border-radius: 2px;
}

.no-results {
    padding: 16px 18px;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.95rem;
}

.calc-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background-color: var(--primary-light);
    color: var(--primary);
    border-radius: 10px;
    margin-bottom: 16px;
}

.calc-icon .material-symbols-outlined {
    font-family: 'Material Symbols Outlined';
    font-weight: normal;
    font-style: normal;
    font-size: 24px;
    line-height: 1;
    letter-spacing: normal;
    text-transform: none;
    display: inline-block;
    white-space: nowrap;
    word-wrap: normal;
    direction: ltr;
    -webkit-font-smoothing: antialiased;
}

/* ==========================================================================
   SPECIFIC DARK MODE COMPONENT OVERRIDES
   ========================================================================== */
@media (prefers-color-scheme: dark) {
    /* Lighter chevron SVG for dropdowns so it doesn't get lost in the dark */
    .input-group select {
        background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    }

    /* Brighten status texts so they pass accessibility contrast on dark backgrounds */
    .status-pass { color: #34d399; }
    .status-warning { color: #fbbf24; }
    .status-fail { color: #f87171; }
    .status-invalid { color: #9ca3af; }
    .warning-text { color: #f87171; }
}