@import url('https://fonts.googleapis.com/css2?family=Share+Tech+Mono&display=swap');

/* --- GLOBAL RESET & FIX --- */
* {
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
}

body {
    margin: 0;
    overflow: hidden;
    background-color: #000;
    font-family: 'Share Tech Mono', monospace;
    color: #00f3ff;
}

.hidden {
    display: none !important;
}

/* ============================================
   LOADING SCREEN
   ============================================ */
#loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #000;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.loading-content {
    text-align: center;
    position: relative;
}

.loading-title {
    font-size: 2.5rem;
    letter-spacing: 8px;
    color: #fff;
    margin-bottom: 8px;
    text-shadow: 0 0 20px rgba(0, 243, 255, 0.5);
}

.loading-subtitle {
    font-size: 0.9rem;
    color: rgba(0, 243, 255, 0.6);
    letter-spacing: 4px;
    margin-bottom: 50px;
}

.loading-bar-container {
    width: 300px;
    height: 2px;
    background: rgba(255, 255, 255, 0.1);
    margin: 0 auto 20px;
    position: relative;
    overflow: hidden;
}

.loading-bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, #00f3ff, #d000ff);
    box-shadow: 0 0 15px #00f3ff;
    transition: width 0.3s ease-out;
}

.loading-status {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.4);
    letter-spacing: 2px;
    margin-bottom: 8px;
}

.loading-percent {
    font-size: 1.2rem;
    color: #00f3ff;
    letter-spacing: 2px;
}

/* Loading decorations */
.loading-decor {
    position: absolute;
    width: 60px;
    height: 60px;
    border: 1px solid rgba(0, 243, 255, 0.2);
}

.loading-decor-tl {
    top: 40px;
    left: 40px;
    border-right: none;
    border-bottom: none;
}

.loading-decor-br {
    bottom: 40px;
    right: 40px;
    border-left: none;
    border-top: none;
}

/* ============================================
   START SCREEN
   ============================================ */
#start-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.95);
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
}

.start-content {
    text-align: center;
}

.start-title {
    font-size: 3rem;
    letter-spacing: 10px;
    color: #fff;
    margin-bottom: 10px;
    text-shadow: 0 0 30px rgba(0, 243, 255, 0.6);
    animation: glowPulse 3s ease-in-out infinite;
}

.start-version {
    font-size: 0.9rem;
    color: rgba(208, 0, 255, 0.8);
    letter-spacing: 6px;
    margin-bottom: 60px;
}

.start-button {
    background: transparent;
    border: 1px solid rgba(0, 243, 255, 0.5);
    color: #00f3ff;
    font-family: 'Share Tech Mono', monospace;
    font-size: 1.1rem;
    letter-spacing: 3px;
    padding: 18px 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.start-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 243, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.start-button:hover::before {
    left: 100%;
}

.start-button:hover {
    background: rgba(0, 243, 255, 0.1);
    border-color: #00f3ff;
    box-shadow: 0 0 30px rgba(0, 243, 255, 0.3);
    text-shadow: 0 0 10px #00f3ff;
}

.btn-bracket {
    color: rgba(255, 255, 255, 0.3);
    margin: 0 5px;
}

.start-hint {
    font-size: 0.7rem;
    color: rgba(255, 255, 255, 0.3);
    letter-spacing: 2px;
    margin-top: 30px;
    animation: blink 2s ease-in-out infinite;
}

/* Start screen corners */
.start-corner {
    position: absolute;
    width: 80px;
    height: 80px;
    border: 1px solid rgba(0, 243, 255, 0.15);
}

.start-corner-tl {
    top: 50px;
    left: 50px;
    border-right: none;
    border-bottom: none;
}

.start-corner-tr {
    top: 50px;
    right: 50px;
    border-left: none;
    border-bottom: none;
}

.start-corner-bl {
    bottom: 50px;
    left: 50px;
    border-right: none;
    border-top: none;
}

.start-corner-br {
    bottom: 50px;
    right: 50px;
    border-left: none;
    border-top: none;
}

@keyframes glowPulse {
    0%, 100% { text-shadow: 0 0 30px rgba(0, 243, 255, 0.6); }
    50% { text-shadow: 0 0 50px rgba(0, 243, 255, 0.9), 0 0 80px rgba(208, 0, 255, 0.4); }
}

@keyframes blink {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 0.8; }
}

/* ============================================
   MAIN VISUALIZER
   ============================================ */
#canvas-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

/* Fade out animation for screens */
.fade-out {
    animation: fadeOut 0.5s ease-out forwards;
}

@keyframes fadeOut {
    from { opacity: 1; }
    to { opacity: 0; visibility: hidden; }
}

/* 全屏按钮 */
#fullscreen-btn {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 32px;
    height: 32px;
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 4px;
    cursor: pointer;
    z-index: 100;
    opacity: 0.3;
    transition: opacity 0.3s, border-color 0.3s;
}

#fullscreen-btn:hover {
    opacity: 0.8;
    border-color: rgba(0, 243, 255, 0.5);
}

#fullscreen-btn::before,
#fullscreen-btn::after {
    content: '';
    position: absolute;
    width: 8px;
    height: 8px;
    border: 1px solid rgba(255, 255, 255, 0.5);
}

#fullscreen-btn::before {
    top: 6px;
    left: 6px;
    border-right: none;
    border-bottom: none;
}

#fullscreen-btn::after {
    bottom: 6px;
    right: 6px;
    border-left: none;
    border-top: none;
}