/* ==========================================================================
   PRASUN TOOLS — TOOL PAGE SHARED STYLES
   10/10 Modern Engineering Calculator UI
   ========================================================================== */

/* --------------------------------------------------------------------------
   0. CSS VARIABLE DEFAULTS & FALLBACKS
   -------------------------------------------------------------------------- */
:root {
    --brand-blue: #2563eb;
    --brand-blue-hover: #1d4ed8;
    --brand-blue-light: rgba(37, 99, 235, 0.1);
    
    --accent-color: var(--brand-blue);
    --surface: #ffffff;
    --card-bg: var(--surface);
    --bg-secondary: #f8fafc;
    --bg-color: var(--bg-secondary);
    
    --border-light: #e2e8f0;
    --border-color: var(--border-light);
    --border-hover: #cbd5e1);
    
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    
    --success-bg: #f0fdf4;
    --success-border: #bbf7d0;
    --success-text: #166534;
    
    --radius-lg: 16px;
    --radius-md: 12px;
    --radius-sm: 8px;
    --radius-full: 9999px;
    
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --transition-smooth: 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Dark Theme Overrides */
[data-theme="dark"] {
    --surface: #1e293b;
    --card-bg: var(--surface);
    --bg-secondary: #0f172a;
    --bg-color: var(--bg-secondary);
    
    --border-light: #334155;
    --border-color: var(--border-light);
    --border-hover: #475569;
    
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    
    --success-bg: rgba(20, 83, 45, 0.25);
    --success-border: rgba(34, 197, 94, 0.3);
    --success-text: #4ade80;
}

/* --------------------------------------------------------------------------
   1. TOOL MAIN LAYOUT & HEADER
   -------------------------------------------------------------------------- */
.tool-main {
    padding: 2.5rem 0 4rem;
}

.tool-header {
    margin-bottom: 2rem;
}

.tool-badge-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    background: var(--brand-blue-light);
    color: var(--brand-blue);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    margin-bottom: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.tool-badge-pill .material-symbols-outlined {
    font-size: 1rem;
}

.tool-header h1 {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 0.375rem;
    color: var(--text-primary);
}

.tool-header p {
    font-size: 1rem;
    color: var(--text-secondary);
    max-width: 650px;
    line-height: 1.5;
}

/* --------------------------------------------------------------------------
   2. WORKSPACE GRID LAYOUT
   -------------------------------------------------------------------------- */
.tool-workspace {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 360px;
    gap: 1.5rem;
    align-items: start;
}

/* --------------------------------------------------------------------------
   3. CALCULATOR CARD & FORM
   -------------------------------------------------------------------------- */
.calculator-card {
    background-color: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.04);
    transition: box-shadow 0.3s ease, border-color 0.3s ease;
}

.calculator-card:hover {
    box-shadow: 0 16px 36px -12px rgba(0, 0, 0, 0.08);
}

.calculator-inner {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* Fieldset Section Group */
.form-section-group {
    border: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.section-title-tag {
    font-size: 0.8125rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    width: 100%;
}

.section-title-tag::after {
    content: "";
    flex: 1;
    height: 1px;
    background-color: var(--border-color);
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    flex: 0 0 22px;
    background: var(--brand-blue);
    color: #ffffff;
    font-size: 0.75rem;
    font-weight: 700;
    border-radius: var(--radius-full);
}

/* --------------------------------------------------------------------------
   4. INPUT ROW CARD & FIELDS
   -------------------------------------------------------------------------- */
.input-row-card {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    align-items: center;
    padding: 1.125rem 1.25rem;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all var(--transition-smooth);
}

.input-row-card:hover {
    border-color: var(--border-hover);
}

.input-row-card:focus-within {
    border-color: var(--brand-blue);
    box-shadow: 0 0 0 3px var(--brand-blue-light);
    background-color: var(--surface);
}

.select-group, 
.input-group {
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-width: 0;
    gap: 0.25rem;
}

.select-group label, 
.input-group label {
    font-size: 0.775rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    font-weight: 700;
    color: var(--text-primary);
}

.input-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Field Wrappers & Inputs */
.input-field-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    width: 100%;
}

.input-field-wrapper input,
.input-field-wrapper select {
    width: 100%;
    height: 44px;
    padding: 0 1rem;
    background-color: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-primary);
    outline: none;
    transition: border-color var(--transition-smooth), box-shadow var(--transition-smooth);
}

.input-field-wrapper input {
    font-family: var(--font-mono);
    padding-right: 4.5rem;
}

.input-field-wrapper input:focus,
.input-field-wrapper select:focus {
    border-color: var(--brand-blue);
    box-shadow: 0 0 0 3px var(--brand-blue-light);
}

.input-field-wrapper input::placeholder {
    color: var(--text-muted);
}

/* Remove number spinners */
.input-field-wrapper input[type="number"]::-webkit-inner-spin-button,
.input-field-wrapper input[type="number"]::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}
.input-field-wrapper input[type="number"] {
    appearance: textfield;
}

/* Integrated Unit Badge */
.input-unit {
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2rem;
    height: 26px;
    padding: 0 0.5rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: 0.725rem;
    font-weight: 600;
    text-transform: uppercase;
    pointer-events: none;
}

/* Custom Select Dropdowns */
.input-field-wrapper select {
    cursor: pointer;
    padding-right: 2.5rem;
    appearance: none;
}

.select-arrow {
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    pointer-events: none;
    font-size: 20px;
}

/* Dynamic Power Calculator Specifics */
#powerCalcInputSection {
    margin: 0;
}

#powerCalcInputs {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

/* --------------------------------------------------------------------------
   5. ACTION BUTTONS
   -------------------------------------------------------------------------- */
.action-buttons {
    display: flex;
    gap: 0.875rem;
    margin-top: 1.5rem;
}

.btn {
    flex: 1;
    height: 48px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    cursor: pointer;
    border: none;
    transition: all var(--transition-smooth);
}

.btn:active {
    transform: translateY(1px);
}

.btn .material-symbols-outlined {
    font-size: 20px;
}

.primary-btn {
    flex: 2;
    background-color: var(--brand-blue);
    color: #ffffff !important;
    box-shadow: 0 4px 12px var(--brand-blue-light);
}

.primary-btn:hover {
    background-color: var(--brand-blue-hover);
    transform: translateY(-1px);
    box-shadow: 0 6px 16px var(--brand-blue-light);
}

.secondary-btn {
    flex: 1;
    background-color: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.secondary-btn:hover {
    background-color: var(--bg-secondary);
    border-color: var(--border-hover);
}

/* --------------------------------------------------------------------------
   6. RESULTS DISPLAY BOX
   -------------------------------------------------------------------------- */
.results-box {
    margin-top: 1.75rem;
    padding: 1.5rem;
    background: var(--success-bg);
    border: 1px solid var(--success-border);
    border-radius: var(--radius-md);
    animation: fadeIn 0.35s var(--transition-smooth);
}

.results-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
    color: var(--success-text);
}

.results-header .material-symbols-outlined {
    font-size: 22px;
}

.results-header h3 {
    font-size: 0.875rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-primary);
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 0.875rem;
}

.result-item {
    background: var(--surface);
    border: 1px solid var(--success-border);
    border-radius: var(--radius-sm);
    padding: 1rem;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.result-item:hover {
    border-color: var(--brand-blue);
    transform: translateY(-2px);
}

.result-label {
    display: block;
    font-size: 0.725rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-secondary);
}

.result-value {
    display: block;
    font-family: var(--font-mono);
    font-size: 1.35rem;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.02em;
    overflow-wrap: anywhere;
}

/* --------------------------------------------------------------------------
   7. BANNERS & ERROR STATES
   -------------------------------------------------------------------------- */
.error-banner,
.success-banner {
    display: flex;
    align-items: flex-start;
    gap: 0.625rem;
    width: 100%;
    padding: 0.75rem 1rem;
    margin-bottom: 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.8125rem;
    line-height: 1.5;
}

.error-banner {
    background: #fef2f2;
    border: 1px solid #fecaca;
    color: #b91c1c;
}

.success-banner {
    background: var(--success-bg);
    border: 1px solid var(--success-border);
    color: var(--success-text);
}

[data-theme="dark"] .error-banner {
    background: rgba(127, 29, 29, 0.25);
    border-color: rgba(248, 113, 113, 0.3);
    color: #fca5a5;
}

.error-banner .material-symbols-outlined,
.success-banner .material-symbols-outlined {
    flex: 0 0 auto;
    font-size: 18px;
}

.input-field-wrapper input.input-error,
.input-field-wrapper select.input-error {
    border-color: #dc2626 !important;
    box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.15) !important;
}

/* --------------------------------------------------------------------------
   8. FORMULA REFERENCE SIDEBAR
   -------------------------------------------------------------------------- */
.info-card {
    background-color: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.04);
}

.info-header {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    margin-bottom: 1.25rem;
    color: var(--text-primary);
}

.info-header .material-symbols-outlined {
    color: var(--brand-blue);
    font-size: 22px;
}

.info-header h3 {
    font-size: 0.95rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.formula-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.formula-list li {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    padding-bottom: 0.875rem;
    border-bottom: 1px solid var(--border-color);
}

.formula-list li:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.formula-name {
    font-size: 0.825rem;
    font-weight: 700;
    color: var(--text-primary);
}

.formula-eq {
    font-size: 0.8rem;
    font-family: var(--font-mono);
    color: var(--brand-blue);
    background-color: var(--bg-secondary);
    padding: 0.35rem 0.625rem;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    width: fit-content;
    overflow-wrap: anywhere;
}

/* Animations */
@keyframes fadeIn {
    from { 
        opacity: 0; 
        transform: translateY(8px); 
    }
    to { 
        opacity: 1; 
        transform: translateY(0); 
    }
}

/* --------------------------------------------------------------------------
   9. RESPONSIVE BREAKPOINTS
   -------------------------------------------------------------------------- */
@media (max-width: 900px) {
    .tool-workspace {
        grid-template-columns: 1fr;
    }

    .info-card {
        order: 2;
    }
}

@media (max-width: 640px) {
    .tool-main {
        padding: 2rem 0 3rem;
    }

    .calculator-card {
        padding: 1.25rem;
    }

    .tool-header {
        margin-bottom: 1.5rem;
    }

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

    .tool-header p {
        font-size: 0.9375rem;
    }

    .input-row-card {
        grid-template-columns: 1fr;
        gap: 0.625rem;
        padding: 0.875rem;
    }

    .action-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .results-grid {
        grid-template-columns: 1fr;
    }

    .info-card {
        padding: 1.25rem;
    }
}

@media (max-width: 420px) {
    .tool-header h1 {
        font-size: 1.5rem;
    }

    .calculator-card {
        padding: 1rem;
    }

    .results-box {
        padding: 1rem;
    }

    .result-value {
        font-size: 1.15rem;
    }
}