/* ====================================================
   NEUMORPHISM DESIGN SYSTEM
   Soft UI: extruded plastic effect on solid surfaces.
   Best viewed on flat, uniform backgrounds.
   ==================================================== */

/* --- VARIABLES --- */
:root {
    /* Neumorphic color palette - tuned for dark theme */
    --neu-bg: #0f1115;
    --neu-bg-elevated: #14171c;
    --neu-light: rgba(255, 255, 255, 0.06);
    --neu-dark: rgba(0, 0, 0, 0.5);
    --neu-distance: 6px;
    --neu-blur: 14px;
    --neu-radius: 14px;
    --neu-radius-lg: 20px;
    --neu-radius-pill: 50px;
}

/* Light mode adjusts */
.light-mode {
    --neu-bg: #e8e8ec;
    --neu-bg-elevated: #f0f0f4;
    --neu-light: rgba(255, 255, 255, 0.85);
    --neu-dark: rgba(0, 0, 0, 0.1);
}

/* ====================================================
   BASE NEUMORPHIC CLASSES
   ==================================================== */

/* Raised surface */
.neu-raised {
    background: var(--neu-bg-elevated);
    border-radius: var(--neu-radius);
    box-shadow:
        var(--neu-distance) var(--neu-distance) var(--neu-blur) var(--neu-dark),
        calc(var(--neu-distance) * -1) calc(var(--neu-distance) * -1) var(--neu-blur) var(--neu-light);
    transition: box-shadow 0.2s ease, transform 0.15s ease;
}

/* Pressed/inset surface */
.neu-pressed {
    background: var(--neu-bg);
    border-radius: var(--neu-radius);
    box-shadow:
        inset var(--neu-distance) var(--neu-distance) var(--neu-blur) var(--neu-dark),
        inset calc(var(--neu-distance) * -1) calc(var(--neu-distance) * -1) var(--neu-blur) var(--neu-light);
}

/* ====================================================
   NAVIGATION ACTION BUTTONS (theme, language)
   ==================================================== */
.nav-action-btn {
    /* Replace transparent with neumorphic raised */
    background: var(--neu-bg-elevated) !important;
    border-radius: 50% !important;
    box-shadow:
        var(--neu-distance) var(--neu-distance) var(--neu-blur) var(--neu-dark),
        calc(var(--neu-distance) * -1) calc(var(--neu-distance) * -1) var(--neu-blur) var(--neu-light);
    transition: all 0.2s ease;
}

.nav-action-btn:hover {
    transform: translateY(-2px);
    box-shadow:
        8px 8px 16px var(--neu-dark),
        -8px -8px 16px var(--neu-light);
}

.nav-action-btn:active {
    transform: translateY(0);
    box-shadow:
        inset 4px 4px 8px var(--neu-dark),
        inset -4px -4px 8px var(--neu-light);
}

/* Language toggle pill */
#lang-toggle {
    border-radius: var(--neu-radius-pill) !important;
    font-weight: 600;
    min-width: 44px;
}

/* ====================================================
   NAV ACTIONS CONTAINER
   ==================================================== */
.nav-actions {
    /* Replace glass with neumorphic container */
    background: var(--neu-bg-elevated) !important;
    border: none !important;
    box-shadow:
        inset 2px 2px 6px var(--neu-dark),
        inset -2px -2px 6px var(--neu-light);
    border-radius: var(--neu-radius-pill) !important;
}

/* ====================================================
   CONTACT SOCIAL BUTTONS
   ==================================================== */
.social-btn {
    /* Replace glass panel with neumorphic button */
    background: var(--neu-bg-elevated);
    border: none !important;
    box-shadow:
        var(--neu-distance) var(--neu-distance) var(--neu-blur) var(--neu-dark),
        calc(var(--neu-distance) * -1) calc(var(--neu-distance) * -1) var(--neu-blur) var(--neu-light);
}

.social-btn:hover {
    transform: translateY(-3px);
    box-shadow:
        10px 10px 20px var(--neu-dark),
        -10px -10px 20px var(--neu-light);
    border-color: var(--tint, var(--accent-color)) !important;
}

.social-btn:active {
    transform: translateY(0);
    box-shadow:
        inset 4px 4px 8px var(--neu-dark),
        inset -4px -4px 8px var(--neu-light);
}

/* ====================================================
   SORT DEMO CONTROLS
   ==================================================== */

/* Algorithm selection buttons */
.sd-algo {
    background: var(--neu-bg-elevated) !important;
    border: none !important;
    box-shadow:
        var(--neu-distance) var(--neu-distance) var(--neu-blur) var(--neu-dark),
        calc(var(--neu-distance) * -1) calc(var(--neu-distance) * -1) var(--neu-blur) var(--neu-light);
}

.sd-algo:hover {
    color: var(--text-main) !important;
    box-shadow:
        8px 8px 16px var(--neu-dark),
        -8px -8px 16px var(--neu-light);
}

.sd-algo[aria-pressed="true"] {
    /* Active state = pressed/inset */
    background: var(--neu-bg) !important;
    color: var(--accent-color) !important;
    box-shadow:
        inset 4px 4px 8px var(--neu-dark),
        inset -4px -4px 8px var(--neu-light);
}

/* Play/Step/Shuffle buttons */
.sd-btn {
    background: var(--neu-bg-elevated) !important;
    border: none !important;
    box-shadow:
        var(--neu-distance) var(--neu-distance) var(--neu-blur) var(--neu-dark),
        calc(var(--neu-distance) * -1) calc(var(--neu-distance) * -1) var(--neu-blur) var(--neu-light);
}

.sd-btn:hover {
    color: var(--text-main) !important;
    border-color: rgba(var(--accent-rgb), 0.4) !important;
    box-shadow:
        8px 8px 16px var(--neu-dark),
        -8px -8px 16px var(--neu-light);
}

.sd-btn:active {
    box-shadow:
        inset 4px 4px 8px var(--neu-dark),
        inset -4px -4px 8px var(--neu-light);
}

/* Primary play button accent */
.sd-btn-primary {
    background: linear-gradient(145deg, var(--accent-color), color-mix(in srgb, var(--accent-color) 80%, #000)) !important;
    color: #fff !important;
    box-shadow:
        4px 4px 10px rgba(0, 0, 0, 0.4),
        -2px -2px 8px var(--neu-light) !important;
}

.sd-btn-primary:hover {
    box-shadow:
        6px 6px 14px rgba(0, 0, 0, 0.5),
        -2px -2px 8px var(--neu-light) !important;
}

.sd-btn-primary:active {
    box-shadow:
        inset 3px 3px 6px rgba(0, 0, 0, 0.4),
        inset -2px -2px 4px rgba(255, 255, 255, 0.1) !important;
}

/* ====================================================
   SPEED SLIDER
   ==================================================== */
.sd-speed {
    -webkit-appearance: none;
    appearance: none;
    height: 8px;
    background: var(--neu-bg);
    border-radius: 4px;
    box-shadow:
        inset 2px 2px 4px var(--neu-dark),
        inset -2px -2px 4px var(--neu-light);
    accent-color: var(--accent-color);
}

.sd-speed::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--neu-bg-elevated);
    cursor: pointer;
    box-shadow:
        3px 3px 6px var(--neu-dark),
        -3px -3px 6px var(--neu-light);
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.sd-speed::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow:
        4px 4px 8px var(--neu-dark),
        -4px -4px 8px var(--neu-light);
}

.sd-speed::-webkit-slider-thumb:active {
    transform: scale(0.95);
    box-shadow:
        inset 2px 2px 4px var(--neu-dark),
        inset -2px -2px 4px var(--neu-light);
}

/* Firefox */
.sd-speed::-moz-range-thumb {
    width: 22px;
    height: 22px;
    border: none;
    border-radius: 50%;
    background: var(--neu-bg-elevated);
    cursor: pointer;
    box-shadow:
        3px 3px 6px var(--neu-dark),
        -3px -3px 6px var(--neu-light);
}

/* ====================================================
   PROGRESS BAR
   ==================================================== */
.progress-container {
    background: transparent;
}

.progress-bar {
    background: transparent !important;
    box-shadow:
        inset 2px 2px 4px var(--neu-dark),
        inset -2px -2px 4px var(--neu-light);
    border-radius: 4px;
    position: relative;
    overflow: hidden;
}

.progress-bar::after {
    content: '';
    position: absolute;
    top: 2px;
    bottom: 2px;
    left: 2px;
    border-radius: 2px;
    background: linear-gradient(90deg, var(--accent-color), var(--c-blue));
    box-shadow: 0 0 8px var(--accent-color), 0 0 16px rgba(var(--accent-rgb), 0.4);
}

/* ====================================================
   BACK TO TOP BUTTON
   ==================================================== */
.back-to-top {
    background: var(--neu-bg-elevated) !important;
    border: none !important;
    box-shadow:
        var(--neu-distance) var(--neu-distance) var(--neu-blur) var(--neu-dark),
        calc(var(--neu-distance) * -1) calc(var(--neu-distance) * -1) var(--neu-blur) var(--neu-light);
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow:
        10px 10px 20px var(--neu-dark),
        -10px -10px 20px var(--neu-light);
    border-color: var(--accent-color) !important;
}

.back-to-top:active {
    box-shadow:
        inset 4px 4px 8px var(--neu-dark),
        inset -4px -4px 8px var(--neu-light);
}

/* ====================================================
   HERO BUTTONS (primary CTA)
   ==================================================== */
.btn-primary {
    background: var(--neu-bg-elevated) !important;
    color: var(--text-main) !important;
    border: none !important;
    box-shadow:
        var(--neu-distance) var(--neu-distance) var(--neu-blur) var(--neu-dark),
        calc(var(--neu-distance) * -1) calc(var(--neu-distance) * -1) var(--neu-blur) var(--neu-light);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow:
        10px 10px 20px var(--neu-dark),
        -10px -10px 20px var(--neu-light);
}

.btn-primary:active {
    transform: translateY(1px);
    box-shadow:
        inset 4px 4px 8px var(--neu-dark),
        inset -4px -4px 8px var(--neu-light);
}

/* Secondary button - flat with border */
.btn-secondary {
    background: var(--neu-bg) !important;
    border: none !important;
    box-shadow:
        inset 3px 3px 6px var(--neu-dark),
        inset -3px -3px 6px var(--neu-light);
}

.btn-secondary:hover {
    background: var(--neu-bg-elevated) !important;
    transform: translateY(-2px);
    box-shadow:
        var(--neu-distance) var(--neu-distance) var(--neu-blur) var(--neu-dark),
        calc(var(--neu-distance) * -1) calc(var(--neu-distance) * -1) var(--neu-blur) var(--neu-light);
}

.btn-secondary:active {
    box-shadow:
        inset 4px 4px 8px var(--neu-dark),
        inset -4px -4px 8px var(--neu-light);
}

/* ====================================================
   MOBILE RESPONSIVENESS
   ==================================================== */
@media (max-width: 700px) {
    /* Simplify shadows on mobile for performance */
    .nav-action-btn,
    .social-btn,
    .sd-algo,
    .sd-btn,
    .btn-primary,
    .back-to-top {
        box-shadow:
            4px 4px 10px var(--neu-dark),
            -4px -4px 10px var(--neu-light);
    }

    .nav-action-btn:hover,
    .social-btn:hover,
    .sd-algo:hover,
    .sd-btn:hover,
    .btn-primary:hover,
    .back-to-top:hover {
        transform: none;
    }

    .sd-btn-primary {
        box-shadow:
            3px 3px 8px rgba(0, 0, 0, 0.4),
            -2px -2px 6px var(--neu-light) !important;
    }
}

/* ====================================================
   THEME TRANSITION ANIMATION
   Full-screen circular reveal on theme switch
   ==================================================== */
.theme-transition-overlay {
    position: fixed;
    inset: 0;
    background: linear-gradient(135deg, var(--neu-bg) 0%, var(--neu-bg-elevated) 100%);
    z-index: 99998;
    pointer-events: none;
    animation: theme-reveal 0.5s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes theme-reveal {
    0% {
        clip-path: circle(0% at var(--tx) var(--ty));
    }
    100% {
        clip-path: circle(150% at var(--tx) var(--ty));
    }
}

/* Theme switch light-out effect */
.theme-transition-out {
    animation: theme-out 0.3s cubic-bezier(0.4, 0, 1, 1) forwards;
}

@keyframes theme-out {
    0% {
        opacity: 1;
        filter: brightness(1);
    }
    100% {
        opacity: 0;
        filter: brightness(0.5);
    }
}

/* Theme switch light-in effect */
.theme-transition-in {
    animation: theme-in 0.4s cubic-bezier(0, 0, 0.2, 1) forwards;
}

@keyframes theme-in {
    0% {
        opacity: 0;
        filter: brightness(1.5);
    }
    100% {
        opacity: 1;
        filter: brightness(1);
    }
}

/* ====================================================
   ADDITIONAL NEUMORPHIC ELEMENTS
   ==================================================== */

/* Timeline items */
.timeline-item {
    background: var(--neu-bg-elevated) !important;
    box-shadow:
        var(--neu-distance) var(--neu-distance) var(--neu-blur) var(--neu-dark),
        calc(var(--neu-distance) * -1) calc(var(--neu-distance) * -1) var(--neu-blur) var(--neu-light) !important;
}

.timeline-item:hover {
    transform: translateY(-4px);
    box-shadow:
        10px 10px 20px var(--neu-dark),
        -10px -10px 20px var(--neu-light) !important;
}

/* Certificate cards */
.cert-card {
    background: var(--neu-bg-elevated) !important;
    box-shadow:
        var(--neu-distance) var(--neu-distance) var(--neu-blur) var(--neu-dark),
        calc(var(--neu-distance) * -1) calc(var(--neu-distance) * -1) var(--neu-blur) var(--neu-light) !important;
}

.cert-card:hover {
    transform: translateY(-3px);
    box-shadow:
        10px 10px 20px var(--neu-dark),
        -10px -10px 20px var(--neu-light) !important;
}

/* Tag chips */
.tag {
    background: var(--neu-bg) !important;
    box-shadow:
        inset 2px 2px 5px var(--neu-dark),
        inset -2px -2px 5px var(--neu-light) !important;
}

/* Nav links pill */
.nav-links li a {
    background: var(--neu-bg-elevated);
    border-radius: 50px;
    box-shadow:
        3px 3px 8px var(--neu-dark),
        -3px -3px 8px var(--neu-light);
    transition: all 0.2s ease;
}

.nav-links li a:hover {
    transform: translateY(-2px);
    box-shadow:
        5px 5px 12px var(--neu-dark),
        -5px -5px 12px var(--neu-light);
}

.nav-links li a:active {
    box-shadow:
        inset 2px 2px 5px var(--neu-dark),
        inset -2px -2px 5px var(--neu-light);
}

.nav-links li a.active {
    background: linear-gradient(145deg, var(--accent-color), color-mix(in srgb, var(--accent-color) 70%, #000));
    color: #fff;
    box-shadow:
        3px 3px 8px var(--neu-dark),
        -3px -3px 8px var(--neu-light);
}

/* Marquee container */
.marquee-container {
    background: var(--neu-bg) !important;
    box-shadow:
        inset 3px 3px 8px var(--neu-dark),
        inset -3px -3px 8px var(--neu-light) !important;
    border: none !important;
}

/* Bento grid items */
.bento-item {
    background: var(--neu-bg-elevated) !important;
    box-shadow:
        var(--neu-distance) var(--neu-distance) var(--neu-blur) var(--neu-dark),
        calc(var(--neu-distance) * -1) calc(var(--neu-distance) * -1) var(--neu-blur) var(--neu-light) !important;
}

/* Disable tilt transform on span-2 to prevent corner clipping */
.bento-item.span-2 {
    transform: none !important;
    transform-style: flat !important;
    overflow: hidden !important;
}

/* Ensure focus-grid cards don't overflow */
.focus-grid {
    overflow: visible !important;
}

.focus-grid > * {
    overflow: visible !important;
}

/* Achievement cards */
.achievement-card {
    background: var(--neu-bg-elevated) !important;
    box-shadow:
        var(--neu-distance) var(--neu-distance) var(--neu-blur) var(--neu-dark),
        calc(var(--neu-distance) * -1) calc(var(--neu-distance) * -1) var(--neu-blur) var(--neu-light) !important;
}

/* Sort demo source panel */
.sd-source {
    background: var(--neu-bg) !important;
    box-shadow:
        inset 3px 3px 8px var(--neu-dark),
        inset -3px -3px 8px var(--neu-light) !important;
}

/* Search input styling (if any) */
.search-input {
    background: var(--neu-bg) !important;
    border: none !important;
    border-radius: 12px;
    box-shadow:
        inset 3px 3px 8px var(--neu-dark),
        inset -3px -3px 8px var(--neu-light) !important;
    color: var(--text-main);
    padding: 12px 18px;
    transition: box-shadow 0.2s ease;
}

.search-input:focus {
    box-shadow:
        inset 4px 4px 10px var(--neu-dark),
        inset -4px -4px 10px var(--neu-light),
        0 0 0 2px var(--accent-color) !important;
}

/* ====================================================
   REDUCED MOTION
   ==================================================== */
@media (prefers-reduced-motion: reduce) {
    .nav-action-btn,
    .social-btn,
    .sd-algo,
    .sd-btn,
    .btn-primary,
    .btn-secondary,
    .back-to-top,
    .timeline-item,
    .cert-card,
    .bento-item,
    .achievement-card {
        transition: none;
        box-shadow:
            3px 3px 8px var(--neu-dark),
            -3px -3px 8px var(--neu-light) !important;
    }
    .theme-transition-overlay,
    .theme-transition-out,
    .theme-transition-in {
        animation: none;
    }
}