/* Main CSS - Global styles and layout */
/* MinusPlus Calculator App - High-performance dark theme */

/* CSS Custom Properties (CSS Variables) */
:root {
    /* Colors - Dark Theme */
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #3a3a3a;

    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --text-muted: #666666;

    --accent-blue: #007acc;
    --accent-orange: #ffa500;
    --accent-green: #32cd32;
    --accent-red: #ff4444;
    --accent-purple: #9f4fff;

    --text-on-accent: #ffffff;

    /* Clean selection colors - VS Code style */
    --selection-bg: #264f78;
    --selection-text: #ffffff;
    --highlight-match: #515c6a;

    --border-default: rgba(255, 255, 255, 0.2);
    --border-focus: #007acc;
    --border-error: #ff4444;

    /* Typography */
    --font-family-primary: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --font-family-mono: "JetBrains Mono", "SF Mono", "Monaco", "Inconsolata", monospace;

    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-base: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 20px;

    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* Border radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);

    /* Z-index layers */
    --z-canvas: 1;
    --z-input: 1000;
    --z-result: 1001;
    --z-overlay: 1500;
    --z-feedback: 2000;
    --z-modal: 3000;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0.0, 0.2, 1);
    --transition-normal: 300ms cubic-bezier(0.4, 0.0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0.0, 0.2, 1);
}

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

html {
    font-size: 16px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family-primary);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow: hidden;
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
}

/* App container */
#app {
    position: relative;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
}

/* Canvas styles */
#main-canvas {
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--bg-primary);
    cursor: crosshair;
    z-index: var(--z-canvas);
}

/* UI Overlay */
#ui-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: var(--z-overlay);
}

/* Help indicator */
.help-indicator {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: var(--text-secondary);
    font-size: var(--font-size-lg);
    opacity: 0;
    transition: opacity var(--transition-slow);
    pointer-events: none;
}

.help-indicator.fade-in {
    opacity: 1;
}

.help-indicator.fade-out {
    opacity: 0;
}

.help-indicator>span {
    display: block;
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--spacing-md);
}

.help-indicator .shortcuts {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

/* Floating shortcuts button */
.shortcuts-button {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--bg-secondary);
    border: 1px solid var(--border-default);
    color: var(--text-primary);
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
    z-index: 9999;
    /* Highest z-index */
    transition: all var(--transition-fast);
    display: none;
    /* Hidden by default, shown when help indicator is hidden */
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
    pointer-events: auto;
    /* Ensure it can be clicked */
}

.shortcuts-button .minusplus-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-family-mono);
    font-size: 16px;
    font-weight: var(--font-weight-semibold);
    letter-spacing: -1px;
}

.shortcuts-button .minus {
    color: var(--accent-red);
}

.shortcuts-button .plus {
    color: var(--accent-green);
}

.shortcuts-button:hover {
    background: var(--bg-tertiary);
    border-color: var(--accent-blue);
    transform: scale(1.05);
}

.shortcuts-button:active {
    transform: scale(0.95);
}

.shortcuts-button.visible {
    display: flex;
}

/* Clear all button */
.clear-all-button {
    position: fixed;
    top: var(--spacing-lg);
    right: calc(var(--spacing-lg) + 50px);
    /* Position to the left of shortcuts button */
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--bg-secondary);
    border: 1px solid var(--border-default);
    color: var(--text-primary);
    font-size: 16px;
    cursor: pointer;
    z-index: 9999;
    /* Highest z-index */
    transition: all var(--transition-fast);
    display: none;
    /* Hidden by default */
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
    pointer-events: auto;
}

.clear-all-button:hover {
    background: var(--accent-red);
    border-color: var(--accent-red);
    color: white;
    transform: scale(1.05);
}

.clear-all-button:active {
    transform: scale(0.95);
}

.clear-all-button.visible {
    display: flex;
}

/* Mobile responsive layout for buttons */
@media (max-width: 768px) {
    .clear-all-button {
        top: 16px;
        right: 16px;
    }

    .shortcuts-button {
        top: 70px;
        right: 16px;
    }

    .shortcuts-popup {
        top: 120px;
        right: 16px;
        left: 16px;
        min-width: auto;
        max-width: none;
        max-height: calc(100vh - 140px);
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
    }
}

/* Shortcuts popup */
.shortcuts-popup {
    position: fixed;
    top: 70px;
    right: var(--spacing-lg);
    background: var(--bg-overlay);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    z-index: 10000;
    /* Higher than buttons */
    box-shadow: var(--shadow-lg);
    min-width: 280px;
    transition: all var(--transition-normal);
    backdrop-filter: blur(10px);
    display: block;
    /* Always display, control visibility with opacity */
}

.shortcuts-popup.hidden {
    opacity: 0;
    transform: translateY(-10px);
    pointer-events: none;
}

.shortcuts-popup.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.shortcuts-content h3 {
    margin: 0 0 var(--spacing-md) 0;
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-default);
    padding-bottom: var(--spacing-sm);
}

.shortcut-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-xs) 0;
    gap: var(--spacing-md);
}

.shortcut-item .key {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-family: var(--font-family-mono);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    border: 1px solid var(--border-default);
    white-space: nowrap;
    min-width: 80px;
    text-align: center;
}

.shortcut-item .description {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    flex: 1;
}

/* Text input styles */
.canvas-text-input {
    background: transparent;
    border: 1px solid var(--border-default);
    color: var(--text-primary);
    font-family: var(--font-family-mono);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    resize: none;
    min-width: 120px;
    min-height: 40px;
    max-width: 800px;
    max-height: 600px;
    line-height: 1.5;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    z-index: var(--z-input);
    overflow: hidden;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.canvas-text-input:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 2px rgba(0, 122, 204, 0.2);
}

.canvas-text-input::placeholder {
    color: var(--text-muted);
    opacity: 0.7;
}

.canvas-text-input:hover {
    border-color: rgba(255, 255, 255, 0.3);
}

/* Calculation result styles */
.calculation-result {
    color: var(--accent-green);
    font-family: var(--font-family-mono);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(50, 205, 50, 0.1);
    border-radius: var(--radius-sm);
    border: 1px solid rgba(50, 205, 50, 0.3);
    z-index: var(--z-result);
    white-space: nowrap;
    user-select: text;
    -webkit-user-select: text;
    -moz-user-select: text;
    -ms-user-select: text;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.calculation-result:hover {
    background: rgba(50, 205, 50, 0.15);
    border-color: rgba(50, 205, 50, 0.5);
}

/* Clean text highlighting - VS Code style */
.highlight-match {
    background: var(--highlight-match);
    border-radius: 2px;
    padding: 0 1px;
}

/* Remove old overlay styles - use native selection instead */

/* Copy feedback styles */
.copy-feedback {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    background: var(--accent-green);
    color: var(--bg-primary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    z-index: var(--z-feedback);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    box-shadow: var(--shadow-lg);
    transform: translateY(-10px);
    opacity: 0;
    transition: all var(--transition-normal);
}

.copy-feedback.show {
    transform: translateY(0);
    opacity: 1;
}

.copy-feedback.hide {
    transform: translateY(-10px);
    opacity: 0;
}

.copy-feedback .copy-icon {
    font-size: var(--font-size-base);
}

.copy-feedback .copy-text {
    font-size: var(--font-size-sm);
}

/* Format detection feedback styles */
.format-feedback {
    position: fixed;
    top: calc(var(--spacing-lg) + 60px);
    /* Position below copy feedback */
    right: var(--spacing-lg);
    background: var(--accent-blue);
    color: var(--text-on-accent);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    z-index: var(--z-feedback);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    box-shadow: var(--shadow-lg);
    transform: translateY(-10px);
    opacity: 0;
    transition: all var(--transition-normal);
    max-width: 200px;
}

.format-feedback.show {
    transform: translateY(0);
    opacity: 1;
}

.format-feedback.hide {
    transform: translateY(-10px);
    opacity: 0;
}

.format-feedback.sap {
    background: var(--accent-orange);
}

.format-feedback.accounting {
    background: var(--accent-purple);
}

.format-feedback.currency {
    background: var(--accent-green);
}

.format-feedback .format-icon {
    font-size: var(--font-size-base);
}

.format-feedback .format-text {
    font-size: var(--font-size-sm);
    line-height: 1.3;
}

/* Scrollbar styles (for future scrollable areas) */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb {
    background: var(--border-default);
    border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* Modern text selection - VS Code style */
::selection {
    background: var(--selection-bg);
    color: var(--selection-text);
}

::-moz-selection {
    background: var(--selection-bg);
    color: var(--selection-text);
}

/* Focus styles for accessibility */
*:focus-visible {
    outline: 2px solid var(--accent-blue);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border-default: rgba(255, 255, 255, 0.5);
        --text-secondary: #cccccc;
        --text-muted: #999999;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        transition: none !important;
        animation: none !important;
    }
}

/* Mobile optimizations */
@media (max-width: 768px) {
    .help-indicator {
        font-size: var(--font-size-base);
        padding: var(--spacing-md);
    }

    .help-indicator .shortcuts {
        font-size: var(--font-size-xs);
    }

    .canvas-text-input {
        font-size: 18px;
        /* Prevent zoom on iOS */
        min-width: 100px;
    }

    .copy-feedback {
        top: var(--spacing-md);
        right: var(--spacing-md);
        left: var(--spacing-md);
        max-width: calc(100vw - 2 * var(--spacing-md));
    }

    .shortcuts-popup {
        left: var(--spacing-md);
        max-width: calc(100vw - 2 * var(--spacing-md));
    }

    .shortcut-item {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-xs);
    }

    .shortcut-item .key {
        min-width: auto;
        align-self: flex-start;
    }
}

/* Tablet optimizations */
@media (min-width: 769px) and (max-width: 1024px) {
    .canvas-text-input {
        font-size: var(--font-size-lg);
    }
}

/* Print styles */
@media print {
    body {
        background: white;
        color: black;
    }

    #main-canvas,
    .help-indicator,
    .copy-feedback {
        display: none;
    }

    .canvas-text-input,
    .calculation-result {
        position: static !important;
        border: 1px solid black;
        background: white;
        color: black;
        margin: var(--spacing-sm);
        page-break-inside: avoid;
    }
}

/* Loading states */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

/* Error states */
.error {
    border-color: var(--border-error) !important;
    box-shadow: 0 0 0 2px rgba(255, 68, 68, 0.2) !important;
}

.error-message {
    color: var(--accent-red);
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-xs);
}

/* Utility classes */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.no-select {
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
}

.select-text {
    user-select: text;
    -webkit-user-select: text;
    -moz-user-select: text;
    -ms-user-select: text;
}

.pointer-events-none {
    pointer-events: none;
}

.pointer-events-auto {
    pointer-events: auto;
}

/* Utility: visually hidden (accessible to screen readers) */
.visually-hidden {
    position: absolute !important;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}