/**
 * Percentage Calculator App Styles
 *
 * A production-ready percentage calculator with accessible, responsive design
 */

/* ========================================
   App Container
   ======================================== */

.app-container {
    width: 100%;
    max-width: 700px;
    margin: 0 auto;
}

.pc-container {
    max-width: 700px;
}

/* ========================================
   Percentage Calculator
   ======================================== */

.percentage-calculator {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

/* ========================================
   Section Styling
   ======================================== */

.pc-section {
    padding: var(--space-5) var(--space-6);
    border-bottom: 1px solid var(--color-border);
}

.pc-section:last-of-type {
    border-bottom: none;
}

.pc-section-title {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-3);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ========================================
   Calculation Row Layout
   ======================================== */

.pc-calc-row {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-2);
}

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

.pc-input {
    width: 100px;
    padding: var(--space-3);
    font-size: var(--font-size-base);
    font-family: var(--font-mono);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    text-align: right;
    background: var(--color-bg-alt);
    color: var(--color-text);
}

.pc-input:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
    border-color: var(--color-primary);
}

.pc-input-suffix {
    position: absolute;
    right: var(--space-3);
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    pointer-events: none;
}

.pc-input-group .pc-input {
    padding-right: var(--space-6);
}

/* Remove number input spinners */
.pc-input::-webkit-outer-spin-button,
.pc-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.pc-input[type='number'] {
    -moz-appearance: textfield;
}

.pc-operator {
    font-size: var(--font-size-base);
    color: var(--color-text-muted);
    padding: 0 var(--space-1);
    flex-shrink: 0;
}

.pc-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    flex-shrink: 0;
}

/* ========================================
   Result Styling
   ======================================== */

.pc-result {
    min-width: 100px;
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-lg);
    font-family: var(--font-mono);
    font-weight: 600;
    background: var(--color-bg-alt);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    text-align: right;
    color: var(--color-text);
}

.pc-result-highlight {
    background: var(--color-primary-lighter, rgba(79, 70, 229, 0.1));
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.pc-result-change {
    transition: color var(--transition-fast);
}

.pc-result-change.positive {
    color: #16a34a;
}

.pc-result-change.negative {
    color: #dc2626;
}

.pc-result-secondary {
    font-size: var(--font-size-base);
    font-weight: 500;
    min-width: 80px;
    border-width: 1px;
}

/* ========================================
   Formula Hint
   ======================================== */

.pc-formula {
    margin-top: var(--space-2);
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    font-style: italic;
}

/* ========================================
   Copy Button
   ======================================== */

.pc-copy-btn {
    width: 36px;
    height: 36px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-muted);
    cursor: pointer;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.pc-copy-btn:hover {
    background: var(--color-bg-alt);
    color: var(--color-text);
}

.pc-copy-btn:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

.pc-copy-btn.copied {
    background: #16a34a;
    color: white;
    border-color: #16a34a;
}

/* ========================================
   Mode Toggle (Markup/Discount)
   ======================================== */

.pc-mode-toggle {
    display: inline-flex;
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-1);
    margin-bottom: var(--space-3);
}

.pc-mode-btn {
    padding: var(--space-2) var(--space-4);
    font-size: var(--font-size-sm);
    font-weight: 500;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--color-text-muted);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.pc-mode-btn:hover {
    color: var(--color-text);
}

.pc-mode-btn:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

.pc-mode-btn.active {
    background: var(--color-primary);
    color: white;
}

/* ========================================
   Markup Results Section
   ======================================== */

.pc-markup-results {
    margin-top: var(--space-4);
    padding-top: var(--space-4);
    border-top: 1px dashed var(--color-border);
}

.pc-markup-result-row {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-3);
}

.pc-markup-result-row:last-child {
    margin-bottom: 0;
}

.pc-result-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    min-width: 100px;
}

/* ========================================
   Actions
   ======================================== */

.pc-actions {
    padding: var(--space-4) var(--space-6);
    background: var(--color-bg-alt);
    display: flex;
    justify-content: flex-end;
}

.pc-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    font-size: var(--font-size-sm);
    font-weight: 500;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.pc-btn:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

.pc-btn-secondary {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    color: var(--color-text);
}

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

/* ========================================
   Responsive Design
   ======================================== */

@media (max-width: 600px) {
    .pc-section {
        padding: var(--space-4);
    }

    .pc-calc-row {
        flex-direction: column;
        align-items: stretch;
        gap: var(--space-3);
    }

    .pc-input-group {
        width: 100%;
    }

    .pc-input {
        width: 100%;
    }

    .pc-result {
        width: 100%;
        text-align: center;
    }

    .pc-operator,
    .pc-label {
        text-align: center;
        padding: var(--space-1) 0;
    }

    .pc-copy-btn {
        align-self: flex-end;
    }

    .pc-mode-toggle {
        width: 100%;
        display: flex;
    }

    .pc-mode-btn {
        flex: 1;
        text-align: center;
    }

    .pc-markup-result-row {
        flex-direction: column;
        align-items: stretch;
        gap: var(--space-2);
    }

    .pc-result-label {
        min-width: auto;
    }

    .pc-actions {
        padding: var(--space-4);
    }
}

/* ========================================
   Help Panel (Modal)
   ======================================== */

.help-panel {
    position: fixed;
    inset: 0;
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4);
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.help-panel[hidden] {
    display: none;
}

.help-content {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
}

.help-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4) var(--space-6);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    background: var(--color-bg-card);
    z-index: 1;
}

.help-header h2 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin: 0;
}

.help-body {
    padding: var(--space-6);
}

.help-section {
    margin-bottom: var(--space-6);
}

.help-section:last-child {
    margin-bottom: 0;
}

.help-section h3 {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: var(--space-3);
    color: var(--color-text);
}

.help-steps,
.help-features,
.help-tips {
    padding-left: var(--space-5);
    margin: 0;
}

.help-steps li,
.help-features li,
.help-tips li {
    margin-bottom: var(--space-2);
    color: var(--color-text-muted);
    line-height: 1.6;
}

.help-steps li:last-child,
.help-features li:last-child,
.help-tips li:last-child {
    margin-bottom: 0;
}

/* ========================================
   Help Close Button
   ======================================== */

.help-close {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    color: var(--color-text-muted);
    transition: all var(--transition-fast);
}

.help-close:hover {
    background: var(--color-bg-alt);
    color: var(--color-text);
}

.help-close:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

/* ========================================
   RTL Support
   ======================================== */

[dir="rtl"] .pc-input,
[dir="rtl"] .pc-result {
    text-align: left;
}

[dir="rtl"] .pc-input-suffix {
    right: auto;
    left: var(--space-3);
}

[dir="rtl"] .pc-input-group .pc-input {
    padding-right: var(--space-3);
    padding-left: var(--space-6);
}

[dir="rtl"] .pc-actions {
    justify-content: flex-start;
}

/* ========================================
   Reduced Motion
   ======================================== */

@media (prefers-reduced-motion: reduce) {
    .pc-btn,
    .pc-copy-btn,
    .pc-mode-btn,
    .pc-input,
    .pc-result-change {
        transition: none;
    }
}

/* ========================================
   Print Styles
   ======================================== */

@media print {
    .pc-actions,
    .pc-copy-btn {
        display: none;
    }

    .percentage-calculator {
        box-shadow: none;
        border: 1px solid #ccc;
    }

    .pc-section {
        background: white;
    }
}