/* ===== CSS Custom Properties ===== */
:root {
    /* Gradient colors */
    --gradient-color-1: #667eea;
    --gradient-color-2: #764ba2;
    --gradient-color-3: #f093fb;
    --gradient-color-4: #4facfe;

    /* Animation timings (can be overridden via speed multiplier) */
    --speed-multiplier: 1;
    --gradient-duration: calc(15s / var(--speed-multiplier));
    --logo-shake-duration: calc(3s / var(--speed-multiplier));
    --logo-rotate-duration: calc(8s / var(--speed-multiplier));
    --logo-tilt-duration: calc(4s / var(--speed-multiplier));
    --neon-duration: calc(2s / var(--speed-multiplier));
    --color-change-duration: calc(5s / var(--speed-multiplier));
    --explosion-duration: calc(3s / var(--speed-multiplier));
}

/* ===== Reset & Base Styles ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

/* ===== Background Styles ===== */
.background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    background: linear-gradient(45deg, var(--gradient-color-1), var(--gradient-color-2));
}

/* Animated Background */
.background--animated {
    animation: gradientShift var(--gradient-duration) ease infinite;
    background-size: 400% 400%;
}

/* Gradient Types */
.background--linear {
    background: linear-gradient(45deg, var(--gradient-color-1), var(--gradient-color-2), var(--gradient-color-3), var(--gradient-color-4));
}

.background--radial {
    background: radial-gradient(circle at center, var(--gradient-color-1), var(--gradient-color-2), var(--gradient-color-3), var(--gradient-color-4));
}

.background--conic {
    background: conic-gradient(from 0deg at 50% 50%, var(--gradient-color-1), var(--gradient-color-2), var(--gradient-color-3), var(--gradient-color-4), var(--gradient-color-1));
}

/* ===== Background Animations ===== */
@keyframes gradientShift {
    0% {
        background-position: 0% 50%;
        filter: hue-rotate(0deg);
    }
    25% {
        background-position: 50% 100%;
        filter: hue-rotate(90deg);
    }
    50% {
        background-position: 100% 50%;
        filter: hue-rotate(180deg);
    }
    75% {
        background-position: 50% 0%;
        filter: hue-rotate(270deg);
    }
    100% {
        background-position: 0% 50%;
        filter: hue-rotate(360deg);
    }
}

/* ===== Logo Container ===== */
.logo-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none;
}

.logo {
    width: 100vmin;
    height: 100vmin;
    filter: drop-shadow(0 10px 30px rgba(0, 0, 0, 0.3));
}

/* SVG groups for proper scaling and positioning */
.logo-element {
    transform-origin: center;
    transform-box: fill-box;
}

/* ===== Full Logo Animations ===== */

/* Shake Animation */
.logo--shake {
    animation: shake var(--logo-shake-duration) ease-in-out infinite;
}

@keyframes shake {
    0%, 100% {
        transform: translate(0, 0) rotate(0deg);
    }
    10% {
        transform: translate(-2px, -2px) rotate(-1deg);
    }
    20% {
        transform: translate(2px, 2px) rotate(1deg);
    }
    30% {
        transform: translate(-2px, 2px) rotate(-1deg);
    }
    40% {
        transform: translate(2px, -2px) rotate(1deg);
    }
    50% {
        transform: translate(-2px, -2px) rotate(-1deg);
    }
    60% {
        transform: translate(2px, 2px) rotate(1deg);
    }
    70% {
        transform: translate(-2px, 2px) rotate(-1deg);
    }
    80% {
        transform: translate(2px, -2px) rotate(1deg);
    }
    90% {
        transform: translate(-2px, -2px) rotate(-1deg);
    }
}

/* Rotate Animation */
.logo--rotate {
    animation: rotate var(--logo-rotate-duration) linear infinite;
}

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

/* Tilt Animation */
.logo--tilt {
    animation: tilt var(--logo-tilt-duration) ease-in-out infinite;
}

@keyframes tilt {
    0%, 100% {
        transform: perspective(400px) rotateY(0deg) rotateX(0deg);
    }
    25% {
        transform: perspective(400px) rotateY(15deg) rotateX(-10deg);
    }
    50% {
        transform: perspective(400px) rotateY(0deg) rotateX(10deg);
    }
    75% {
        transform: perspective(400px) rotateY(-15deg) rotateX(-10deg);
    }
}

/* All Full Logo Animations Combined */
.logo--all {
    animation:
        shake var(--logo-shake-duration) ease-in-out infinite,
        rotate calc(var(--logo-rotate-duration) * 2) linear infinite,
        tilt calc(var(--logo-tilt-duration) * 1.5) ease-in-out infinite;
}

/* ===== Internal Element Animations ===== */

/* Neon Blinking */
.logo-element--neon {
    animation: neonBlink var(--neon-duration) ease-in-out infinite;
}

@keyframes neonBlink {
    0%, 100% {
        filter: drop-shadow(0 0 2px currentColor) drop-shadow(0 0 5px currentColor);
        opacity: 1;
    }
    50% {
        filter: drop-shadow(0 0 10px currentColor) drop-shadow(0 0 20px currentColor) drop-shadow(0 0 30px currentColor);
        opacity: 0.8;
    }
}

/* Color Change */
.logo-element-l--color {
    animation: colorChangeL var(--color-change-duration) ease-in-out infinite;
}

.logo-element-s--color {
    animation: colorChangeS var(--color-change-duration) ease-in-out infinite;
}

@keyframes colorChangeL {
    0%, 100% {
        fill: #222;
    }
    25% {
        fill: #667eea;
    }
    50% {
        fill: #f093fb;
    }
    75% {
        fill: #4facfe;
    }
}

@keyframes colorChangeS {
    0%, 100% {
        fill: #dc2108;
    }
    25% {
        fill: #f093fb;
    }
    50% {
        fill: #ffd700;
    }
    75% {
        fill: #00ff00;
    }
}

/* Explosion Animation */
.logo-element-l--explosion {
    animation: explosionL var(--explosion-duration) ease-in-out infinite;
    transform-origin: center;
}

.logo-element-s--explosion {
    animation: explosionS var(--explosion-duration) ease-in-out infinite;
    transform-origin: center;
}

@keyframes explosionL {
    0%, 100% {
        transform: translate(0, 0) scale(1) rotate(0deg);
        opacity: 1;
    }
    50% {
        transform: translate(30px, -30px) scale(1.5) rotate(45deg);
        opacity: 0.5;
    }
}

@keyframes explosionS {
    0%, 100% {
        transform: translate(0, 0) scale(1) rotate(0deg);
        opacity: 1;
    }
    50% {
        transform: translate(-30px, 30px) scale(1.5) rotate(-45deg);
        opacity: 0.5;
    }
}

/* Pulse Animation (bonus) */
.logo-element--pulse {
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.1);
        opacity: 0.8;
    }
}

/* All Element Animations Combined */
.logo-element--all {
    animation:
        neonBlink var(--neon-duration) ease-in-out infinite,
        pulse calc(var(--neon-duration) * 1.5) ease-in-out infinite;
}

.logo-element-l--all {
    animation:
        colorChangeL var(--color-change-duration) ease-in-out infinite,
        explosionL var(--explosion-duration) ease-in-out infinite,
        neonBlink var(--neon-duration) ease-in-out infinite;
}

.logo-element-s--all {
    animation:
        colorChangeS var(--color-change-duration) ease-in-out infinite,
        explosionS var(--explosion-duration) ease-in-out infinite,
        neonBlink var(--neon-duration) ease-in-out infinite;
}

/* Individual S paths */
.s-path-1, .s-path-2 {
    transform-origin: center;
}

.s-path-1--fly {
    animation: flyPath1 var(--explosion-duration) ease-in-out infinite;
}

.s-path-2--fly {
    animation: flyPath2 var(--explosion-duration) ease-in-out infinite;
}

@keyframes flyPath1 {
    0%, 100% {
        transform: translate(0, 0) rotate(0deg);
    }
    50% {
        transform: translate(-40px, 40px) rotate(-180deg);
    }
}

@keyframes flyPath2 {
    0%, 100% {
        transform: translate(0, 0) rotate(0deg);
    }
    50% {
        transform: translate(-40px, -40px) rotate(180deg);
    }
}

/* ===== Toast Notification ===== */
.toast {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%) translateY(-100px);
    background: rgba(0, 0, 0, 0.85);
    color: #fff;
    padding: 16px 24px;
    border-radius: 8px;
    font-size: 14px;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    z-index: 999;
    opacity: 0;
    transition: all 0.3s ease;
    pointer-events: none;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

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

.toast-title {
    font-weight: bold;
    margin-bottom: 4px;
    color: var(--gradient-color-1);
}

.toast-message {
    font-size: 13px;
    opacity: 0.9;
}

/* ===== Help Button ===== */
.help-button {
    position: fixed;
    top: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.75);
    color: #fff;
    border: 2px solid rgba(255, 255, 255, 0.2);
    font-size: 24px;
    font-weight: bold;
    cursor: pointer;
    z-index: 1001;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.help-button:hover {
    background: rgba(102, 126, 234, 0.9);
    border-color: rgba(255, 255, 255, 0.4);
    transform: scale(1.1);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.5);
}

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

/* ===== Help Window ===== */
.help-window {
    position: fixed;
    top: 80px;
    right: 20px;
    width: 500px;
    max-width: calc(100vw - 40px);
    max-height: calc(100vh - 120px);
    background: rgba(20, 20, 30, 0.95);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(20px);
    z-index: 1000;
    opacity: 0;
    transform: translateY(-20px) scale(0.95);
    pointer-events: none;
    transition: all 0.3s ease;
    overflow: hidden;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

.help-window.show {
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: auto;
}

.help-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(102, 126, 234, 0.15);
}

.help-header h2 {
    margin: 0;
    font-size: 20px;
    font-weight: 600;
    color: #fff;
}

.help-close {
    width: 32px;
    height: 32px;
    border: none;
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
    font-size: 24px;
    line-height: 1;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.help-close:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: rotate(90deg);
}

.help-content {
    padding: 20px 24px;
    max-height: calc(100vh - 220px);
    overflow-y: auto;
    color: #e0e0e0;
}

.help-content::-webkit-scrollbar {
    width: 8px;
}

.help-content::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 4px;
}

.help-content::-webkit-scrollbar-thumb {
    background: rgba(102, 126, 234, 0.5);
    border-radius: 4px;
}

.help-content::-webkit-scrollbar-thumb:hover {
    background: rgba(102, 126, 234, 0.7);
}

.help-section {
    margin-bottom: 24px;
}

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

.help-section h3 {
    font-size: 14px;
    font-weight: 600;
    color: var(--gradient-color-1);
    margin: 0 0 12px 0;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.help-item {
    display: flex;
    align-items: center;
    padding: 8px 0;
    font-size: 14px;
    line-height: 1.5;
}

.help-item kbd {
    display: inline-block;
    min-width: 28px;
    padding: 4px 8px;
    margin-right: 12px;
    background: rgba(102, 126, 234, 0.2);
    border: 1px solid rgba(102, 126, 234, 0.4);
    border-radius: 4px;
    font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Courier New', monospace;
    font-size: 13px;
    font-weight: 600;
    text-align: center;
    color: var(--gradient-color-1);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.help-section-url {
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.help-code {
    background: rgba(0, 0, 0, 0.4);
    padding: 12px;
    border-radius: 6px;
    font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Courier New', monospace;
    font-size: 12px;
    color: var(--gradient-color-3);
    margin-bottom: 16px;
    word-break: break-all;
    border: 1px solid rgba(249, 147, 251, 0.2);
}

.help-params {
    display: grid;
    gap: 8px;
    font-size: 13px;
}

.help-params div {
    padding: 6px 0;
}

.help-params strong {
    color: var(--gradient-color-1);
    font-weight: 600;
    margin-right: 8px;
}

/* ===== Footer ===== */
.footer {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 998;
    pointer-events: none;
}

.footer p {
    margin: 0;
    font-size: 13px;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    color: rgba(255, 255, 255, 0.5);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    font-weight: 400;
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    .logo {
        width: 60vmin;
        height: 60vmin;
    }

    .toast {
        top: 15px;
        padding: 12px 20px;
        font-size: 13px;
        max-width: 80%;
    }

    .help-button {
        width: 40px;
        height: 40px;
        font-size: 20px;
        top: 15px;
        right: 15px;
    }

    .help-window {
        top: 70px;
        right: 10px;
        width: calc(100vw - 20px);
        max-height: calc(100vh - 100px);
    }

    .help-header {
        padding: 16px 20px;
    }

    .help-header h2 {
        font-size: 18px;
    }

    .help-content {
        padding: 16px 20px;
    }

    .footer p {
        font-size: 12px;
    }
}

@media (max-width: 480px) {
    .logo {
        width: 70vmin;
        height: 70vmin;
    }

    .toast {
        top: 12px;
        padding: 10px 16px;
        font-size: 12px;
        max-width: 90%;
    }

    .help-button {
        width: 36px;
        height: 36px;
        font-size: 18px;
        top: 12px;
        right: 12px;
    }

    .help-window {
        top: 60px;
        right: 8px;
        width: calc(100vw - 16px);
        max-height: calc(100vh - 80px);
    }

    .help-header {
        padding: 14px 16px;
    }

    .help-header h2 {
        font-size: 16px;
    }

    .help-content {
        padding: 14px 16px;
    }

    .help-item {
        font-size: 13px;
    }

    .help-item kbd {
        font-size: 12px;
        padding: 3px 6px;
    }

    .help-code {
        font-size: 11px;
        padding: 10px;
    }

    .footer {
        bottom: 12px;
    }

    .footer p {
        font-size: 11px;
    }
}

/* ===== Accessibility ===== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}