/* ==========================================
   RESET & VARIABLES
   ========================================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colors */
    --primary: #4a90e2;
    --secondary: #7b68ee;
    --accent: #50fa7b;
    --danger: #ff5555;
    --warning: #f1fa8c;

    /* Backgrounds */
    --bg-dark: #1a1a2e;
    --bg-darker: #0f0f1e;
    --bg-panel: rgba(26, 26, 46, 0.95);
    --bg-input: rgba(40, 40, 60, 0.8);

    /* Text */
    --text-primary: #f8f8f2;
    --text-secondary: #b0b0d0;
    --text-muted: #6272a4;

    /* Effects */
    --border-color: rgba(255, 255, 255, 0.1);
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
    --glow: 0 0 20px rgba(74, 144, 226, 0.5);
}

body {
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-darker);
    color: var(--text-primary);
    overflow: hidden;
}

/* ==========================================
   LOADING SCREEN
   ========================================== */

#loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: linear-gradient(135deg, var(--bg-darker) 0%, var(--bg-dark) 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.5s ease;
}

#loading-screen.fade-out {
    opacity: 0;
    pointer-events: none;
}

.loading-content {
    text-align: center;
    max-width: 400px;
}

.logo {
    font-size: 80px;
    margin-bottom: 20px;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

.loading-content h1 {
    font-size: 32px;
    margin-bottom: 30px;
    background: linear-gradient(90deg, var(--primary), var(--secondary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.loading-bar {
    width: 100%;
    height: 6px;
    background: var(--bg-input);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 15px;
}

.loading-progress {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border-radius: 3px;
    width: 0%;
    transition: width 0.3s ease;
}

#loading-text {
    color: var(--text-secondary);
    font-size: 14px;
}

/* ==========================================
   CANVAS CONTAINER
   ========================================== */

#canvas-container {
    width: 100vw;
    height: 100vh;
    position: relative;
}

/* ==========================================
   PANELS
   ========================================== */

.panel {
    position: fixed;
    background: var(--bg-panel);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: var(--shadow);
    z-index: 1000;
    max-height: 90vh;
    overflow-y: auto;
    transition: all 0.3s ease;
}

.panel.hidden {
    opacity: 0;
    pointer-events: none;
    transform: translateY(-20px);
}

#controls-panel {
    top: 80px;
    right: 20px;
    width: 350px;
}

#info-panel {
    top: 80px;
    right: 20px;
    width: 400px;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
}

.panel-header h2 {
    font-size: 18px;
    color: var(--text-primary);
}

.icon-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 24px;
    cursor: pointer;
    transition: all 0.3s ease;
    padding: 5px;
    line-height: 1;
}

.icon-btn:hover {
    color: var(--primary);
    transform: rotate(90deg);
}

.panel-content {
    padding: 20px;
}

/* Scrollbar */
.panel::-webkit-scrollbar {
    width: 8px;
}

.panel::-webkit-scrollbar-track {
    background: var(--bg-darker);
    border-radius: 4px;
}

.panel::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 4px;
}

/* ==========================================
   CONTROL GROUPS
   ========================================== */

.control-group {
    margin-bottom: 20px;
}

.control-group label {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
    font-size: 13px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.control-group .value {
    color: var(--primary);
    font-weight: 700;
}

.input-row {
    display: flex;
    gap: 10px;
}

input[type="number"],
input[type="text"] {
    flex: 1;
    padding: 10px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 14px;
    outline: none;
    transition: all 0.3s ease;
}

input[type="number"]:focus,
input[type="text"]:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.2);
}

select {
    width: 100%;
    padding: 10px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 14px;
    cursor: pointer;
    outline: none;
    transition: all 0.3s ease;
}

select:hover,
select:focus {
    border-color: var(--primary);
}

select option {
    background: var(--bg-dark);
    color: var(--text-primary);
}

input[type="range"] {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: linear-gradient(to right, var(--primary), var(--secondary));
    outline: none;
    -webkit-appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: white;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    transition: all 0.2s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: var(--glow);
}

input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: white;
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    transition: all 0.2s ease;
}

input[type="range"]::-moz-range-thumb:hover {
    transform: scale(1.2);
    box-shadow: var(--glow);
}

/* ==========================================
   BUTTONS
   ========================================== */

.btn-primary,
.btn-small {
    padding: 12px 24px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border: none;
    border-radius: 8px;
    color: white;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(74, 144, 226, 0.3);
    width: 100%;
}

.btn-primary:hover,
.btn-small:hover {
    transform: translateY(-2px);
    box-shadow: var(--glow);
}

.btn-primary:active,
.btn-small:active {
    transform: translateY(0);
}

.btn-small {
    width: auto;
    padding: 10px 15px;
    font-size: 16px;
}

/* ==========================================
   PRESETS
   ========================================== */

.presets-section {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.presets-section h3 {
    font-size: 14px;
    margin-bottom: 15px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.presets-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.preset-btn {
    padding: 12px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.preset-btn:hover {
    border-color: var(--primary);
    background: var(--bg-dark);
    transform: translateY(-2px);
}

/* ==========================================
   STATS PANEL
   ========================================== */

#stats-panel {
    position: fixed;
    top: 20px;
    left: 20px;
    background: var(--bg-panel);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 15px;
    box-shadow: var(--shadow);
    z-index: 1000;
}

.stat-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
    font-size: 12px;
}

.stat-item:last-child {
    margin-bottom: 0;
}

.stat-label {
    color: var(--text-secondary);
    margin-right: 15px;
}

.stat-value {
    color: var(--accent);
    font-weight: 700;
}

/* ==========================================
   TOOLBAR
   ========================================== */

#toolbar {
    position: fixed;
    top: 20px;
    right: 20px;
    display: flex;
    gap: 10px;
    z-index: 1000;
}

.toolbar-btn {
    width: 50px;
    height: 50px;
    background: var(--bg-panel);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-primary);
    font-size: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
}

.toolbar-btn:hover {
    background: var(--bg-dark);
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: var(--glow);
}

.toolbar-btn:active {
    transform: translateY(0);
}

.toolbar-btn.active {
    background: var(--primary);
    border-color: var(--primary);
}

/* ==========================================
   NOTIFICATION
   ========================================== */

.notification {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-panel);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: 50px;
    padding: 15px 30px;
    box-shadow: var(--shadow);
    z-index: 2000;
    transition: all 0.3s ease;
}

.notification.hidden {
    opacity: 0;
    transform: translate(-50%, 20px);
    pointer-events: none;
}

.notification.success {
    border-color: var(--accent);
    box-shadow: 0 0 20px rgba(80, 250, 123, 0.5);
}

.notification.error {
    border-color: var(--danger);
    box-shadow: 0 0 20px rgba(255, 85, 85, 0.5);
}

#notification-text {
    font-size: 14px;
    font-weight: 600;
}

/* ==========================================
   INFO PANEL CONTENT
   ========================================== */

#info-panel h3 {
    color: var(--primary);
    margin-bottom: 10px;
    font-size: 16px;
}

#info-panel h4 {
    color: var(--secondary);
    margin-top: 20px;
    margin-bottom: 10px;
    font-size: 14px;
}

#info-panel p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 15px;
    font-size: 13px;
}

#info-panel ul {
    list-style: none;
    padding: 0;
}

#info-panel li {
    color: var(--text-secondary);
    padding: 5px 0;
    padding-left: 20px;
    position: relative;
    font-size: 13px;
}

#info-panel li:before {
    content: "▹";
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: bold;
}

.tech-info {
    margin-top: 20px;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
    font-size: 12px;
    color: var(--text-muted);
}

/* ==========================================
   RESPONSIVE
   ========================================== */

@media (max-width: 768px) {
    #controls-panel,
    #info-panel {
        width: calc(100vw - 40px);
        max-width: 350px;
    }

    #toolbar {
        flex-wrap: wrap;
        max-width: calc(100vw - 40px);
    }

    .toolbar-btn {
        width: 45px;
        height: 45px;
        font-size: 18px;
    }

    #stats-panel {
        font-size: 11px;
        padding: 10px;
    }

    .presets-grid {
        grid-template-columns: 1fr;
    }
}

/* ==========================================
   UTILITIES
   ========================================== */

.hidden {
    display: none !important;
}

.disabled {
    opacity: 0.5;
    pointer-events: none;
}