/* ============================================
   AlgoViz — Global Styles (Playground Edition)
   ============================================ */

:root {
    /* Pantone-inspired Palette */
    --warm-ivory: #F5F3ED;
    --soft-cream: #ECEBDB;
    --royal-blue: #224D95;
    --vibrant-pink: #D93D81;

    /* Semantic Surface Colors */
    --bg-primary: #F5F3ED;      /* Warm Ivory */
    --bg-secondary: #ECEBDB;    /* Soft Cream */
    --bg-tertiary: #FFFFFF;     /* White surfaces */
    --bg-elevated: #ECEBDB;     /* Soft Cream */
    --bg-canvas: #FFFFFF;       /* Clean visualization canvas */

    /* Typography Colors */
    --text-primary: #252525;
    --text-secondary: #686868;
    --text-muted: #8C887B;
    --text-white: #FFFFFF;

    /* Borders */
    --border-color: #D8D5C9;
    --border-light: #E7E4D8;
    --border-accent: #224D95;

    /* Brand & Accents */
    --accent-blue: #224D95;     /* Royal Blue */
    --accent-pink: #D93D81;     /* Vibrant Pink */

    /* Algorithm Visual States */
    --color-default: #224D95;   /* Royal Blue */
    --color-comparing: #D4AC0D; /* Warm Gold / Yellow */
    --color-swapping: #D93D81;  /* Vibrant Pink */
    --color-sorted: #27AE60;    /* Emerald Green */
    --color-pivot: #8E44AD;     /* Amethyst Purple */
    --color-found: #27AE60;     /* Emerald Green */
    --color-current: #D93D81;   /* Vibrant Pink for examined search cell */
    --color-checked: #D8D5C9;   /* Muted Beige */
    --color-eliminated: #EAE7DB;/* Eliminated cell bg */
    --color-error: #D93D81;     /* Vibrant Pink */
    --color-warning: #D4AC0D;   /* Warm Gold */

    /* Fonts */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-mono: 'Consolas', 'Monaco', 'Courier New', monospace;
    --font-handwritten: 'Kalam', 'Caveat', cursive;

    /* Radii & Shadows */
    --radius-xs: 4px;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 18px;
    --radius-xl: 30px;
    --shadow-xs: 0 1px 3px rgba(37, 37, 37, 0.04);
    --shadow-sm: 0 2px 6px rgba(37, 37, 37, 0.06);
    --shadow-md: 0 4px 14px rgba(37, 37, 37, 0.08);
    --shadow-hover: 0 6px 18px rgba(34, 77, 149, 0.14);
    --shadow-pink: 0 6px 20px rgba(217, 61, 129, 0.22);
    --transition-fast: 0.15s ease;
    --transition: 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

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

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

body {
    font-family: var(--font-primary);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

/* === Buttons === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-family: var(--font-primary);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    border: 1.5px solid transparent;
    transition: all var(--transition);
    white-space: nowrap;
    user-select: none;
    background: none;
    color: inherit;
}

.btn:active:not(:disabled) {
    transform: translateY(1px) scale(0.98);
}

.btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    box-shadow: none !important;
}

.btn-primary {
    background: var(--royal-blue);
    color: var(--text-white);
    border-color: var(--royal-blue);
    box-shadow: 0 2px 6px rgba(34, 77, 149, 0.18);
}

.btn-primary:hover:not(:disabled) {
    background: var(--vibrant-pink);
    border-color: var(--vibrant-pink);
    color: var(--text-white);
    box-shadow: var(--shadow-pink);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--soft-cream);
    color: var(--royal-blue);
    border-color: var(--royal-blue);
    box-shadow: var(--shadow-xs);
}

.btn-secondary:hover:not(:disabled) {
    border-color: var(--vibrant-pink);
    color: var(--vibrant-pink);
    background: rgba(217, 61, 129, 0.08);
    transform: translateY(-1px);
}

.btn-secondary.active {
    border-color: var(--royal-blue);
    color: var(--text-white);
    background: var(--royal-blue);
    box-shadow: 0 2px 6px rgba(34, 77, 149, 0.2);
}

.btn-icon {
    padding: 8px;
    border-radius: var(--radius-sm);
    background: var(--soft-cream);
    border: 1.5px solid var(--border-color);
    color: var(--royal-blue);
    font-size: 15px;
    width: 38px;
    height: 38px;
    box-shadow: var(--shadow-xs);
}

.btn-icon:hover:not(:disabled) {
    border-color: var(--vibrant-pink);
    color: var(--vibrant-pink);
    background: rgba(217, 61, 129, 0.08);
    transform: translateY(-1px);
}

/* === Prominent Play Button === */
.btn-play-prominent {
    background: var(--royal-blue) !important;
    border-color: var(--royal-blue) !important;
    color: var(--text-white) !important;
    font-size: 16px;
    width: 44px;
    height: 38px;
    box-shadow: 0 3px 10px rgba(34, 77, 149, 0.25) !important;
    transition: all var(--transition) !important;
}

.btn-play-prominent:hover:not(:disabled) {
    background: var(--vibrant-pink) !important;
    border-color: var(--vibrant-pink) !important;
    color: var(--text-white) !important;
    box-shadow: 0 4px 14px rgba(217, 61, 129, 0.35) !important;
    transform: translateY(-1px) scale(1.05);
}

/* === Form Elements === */
input[type="text"],
input[type="number"],
select {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 8px 12px;
    font-size: 13px;
    font-family: var(--font-primary);
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

input[type="text"]:focus,
input[type="number"]:focus,
select:focus {
    border-color: var(--royal-blue);
    box-shadow: 0 0 0 3px rgba(34, 77, 149, 0.12);
}

select {
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23224D95' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
    padding-right: 32px;
    font-weight: 600;
    color: var(--royal-blue);
}

/* === Range Slider === */
input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
    outline: none;
    border: none;
    padding: 0;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 17px;
    height: 17px;
    border-radius: 50%;
    background: var(--royal-blue);
    cursor: pointer;
    border: 2.5px solid #FFFFFF;
    box-shadow: 0 2px 5px rgba(37, 37, 37, 0.25);
    transition: background-color var(--transition-fast), transform var(--transition-fast);
}

input[type="range"]::-webkit-slider-thumb:hover {
    background: var(--vibrant-pink);
    transform: scale(1.18);
}

input[type="range"]::-moz-range-thumb {
    width: 17px;
    height: 17px;
    border-radius: 50%;
    background: var(--royal-blue);
    cursor: pointer;
    border: 2.5px solid #FFFFFF;
    box-shadow: 0 2px 5px rgba(37, 37, 37, 0.25);
    transition: background-color var(--transition-fast), transform var(--transition-fast);
}

input[type="range"]::-moz-range-thumb:hover {
    background: var(--vibrant-pink);
    transform: scale(1.18);
}

/* === Scrollbar === */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* === Navbar Notification Pill === */
.notification {
    position: fixed;
    top: 12px;
    left: 50%;
    transform: translateX(-50%) translateY(-6px) scale(0.95);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 8px 22px;
    border-radius: 9999px; /* Rounded pill shape matching reference */
    background: #ECEBDB; /* Soft Cream */
    border: 1.5px solid #D8D5C9; /* Subtle beige */
    color: #224D95; /* Royal Blue */
    font-family: var(--font-sans);
    font-size: 14px;
    font-weight: 600;
    line-height: 1.3;
    text-align: center;
    box-shadow: 0 4px 16px rgba(34, 77, 149, 0.12), 0 2px 6px rgba(37, 37, 37, 0.06);
    z-index: 10000;
    opacity: 0;
    pointer-events: none; /* Never blocks user interaction with the visualizer */
    transition: opacity 0.25s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    max-width: min(440px, 90vw);
    width: auto;
    word-break: break-word;
}

.notification.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0) scale(1);
}

.notification-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    font-size: 13px;
    font-weight: 800;
    line-height: 1;
    flex-shrink: 0;
}

.notification.success {
    background: #ECEBDB;
    border-color: #D8D5C9;
    color: #224D95;
}

.notification.success .notification-icon {
    background: #27AE60; /* Success accent green */
    color: #FFFFFF;
}

.notification.info {
    background: #ECEBDB;
    border-color: #D8D5C9;
    color: #224D95;
}

.notification.info .notification-icon {
    background: #224D95;
    color: #FFFFFF;
}

.notification.error {
    background: #ECEBDB;
    border-color: var(--vibrant-pink);
    color: #224D95;
}

.notification.error .notification-icon {
    background: var(--vibrant-pink);
    color: #FFFFFF;
}

.notification-text {
    flex: 1;
}

@media (prefers-reduced-motion: reduce) {
    .notification {
        transform: translateX(-50%) !important;
        transition: opacity 0.15s ease !important;
    }
    .notification.show {
        transform: translateX(-50%) !important;
    }
}

/* === Value and Action Chips === */
.val-chip {
    display: inline-block;
    background: #FFFFFF;
    border: 1px solid var(--border-color);
    padding: 1px 7px;
    border-radius: 4px;
    font-weight: 700;
    color: var(--royal-blue);
    font-family: var(--font-mono);
    font-size: 12px;
    box-shadow: 0 1px 2px rgba(37,37,37,0.05);
}

.val-chip.highlight {
    background: rgba(217, 61, 129, 0.12);
    border-color: var(--vibrant-pink);
    color: var(--vibrant-pink);
}

.op-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 10.5px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.6px;
    padding: 3px 8px;
    border-radius: 4px;
    margin-bottom: 8px;
}

.op-badge.compare {
    background: rgba(212, 172, 13, 0.15);
    color: #9A7D0A;
    border: 1px solid rgba(212, 172, 13, 0.4);
}

.op-badge.swap {
    background: rgba(217, 61, 129, 0.12);
    color: var(--vibrant-pink);
    border: 1px solid rgba(217, 61, 129, 0.35);
}

.op-badge.sorted {
    background: rgba(39, 174, 96, 0.15);
    color: #1E8449;
    border: 1px solid rgba(39, 174, 96, 0.35);
}

.op-badge.pivot {
    background: rgba(142, 68, 173, 0.12);
    color: #8E44AD;
    border: 1px solid rgba(142, 68, 173, 0.35);
}

.op-badge.search {
    background: rgba(34, 77, 149, 0.12);
    color: var(--royal-blue);
    border: 1px solid rgba(34, 77, 149, 0.3);
}

/* === Floating Canvas Operation Indicator === */
.canvas-status-pill {
    position: absolute;
    top: 14px;
    right: 24px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 12px;
    border-radius: 20px;
    background: #FFFFFF;
    border: 1.5px solid var(--border-color);
    font-size: 11.5px;
    font-weight: 600;
    color: var(--royal-blue);
    box-shadow: var(--shadow-sm);
    z-index: 10;
    transition: all var(--transition-fast);
}

.canvas-status-pill .pulse-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--royal-blue);
}

.canvas-status-pill.swapping {
    border-color: var(--vibrant-pink);
    color: var(--vibrant-pink);
}

.canvas-status-pill.swapping .pulse-dot {
    background: var(--vibrant-pink);
    box-shadow: 0 0 6px rgba(217, 61, 129, 0.6);
}

.canvas-status-pill.sorted {
    border-color: var(--color-sorted);
    color: #1E8449;
}

.canvas-status-pill.sorted .pulse-dot {
    background: var(--color-sorted);
}

/* === Satisfying Completion Banner === */
.completion-banner {
    position: absolute;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 10px 20px;
    border-radius: var(--radius-md);
    background: #FFFFFF;
    border: 2px solid var(--color-sorted);
    box-shadow: 0 8px 24px rgba(39, 174, 96, 0.2);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition);
    z-index: 20;
}

.completion-banner.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
    pointer-events: auto;
}

.completion-banner-text {
    font-size: 13.5px;
    font-weight: 700;
    color: #1E8449;
}

.completion-banner-sub {
    font-size: 11.5px;
    color: var(--text-secondary);
    font-weight: 500;
}

.btn-replay {
    padding: 4px 12px;
    font-size: 11.5px;
    border-radius: var(--radius-sm);
    background: #1E8449;
    color: #FFFFFF;
    border: none;
    cursor: pointer;
    font-weight: 600;
    transition: background-color var(--transition-fast);
}

.btn-replay:hover {
    background: #196F3D;
}

/* === Screen-reader only === */
.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;
}