uandm/a.html at main · ofirm-git/uandm · GitHub

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<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>uandm · 开屏</title>
    <style>
        /* ===== 极简重置 ===== */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        html,
        body {
            width: 100%;
            height: 100%;
            overflow: hidden;
            background: #0a0618;
            font-family: 'Arial Black', 'Helvetica Neue', sans-serif;
            display: flex;
            justify-content: center;
            align-items: center;
            user-select: none;
        }

        /* ===== 画布 (粒子) ===== */
        #particleCanvas {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: 0;
            pointer-events: none;
        }

        /* ===== 主容器 ===== */
        .hero {
            position: relative;
            z-index: 1;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            width: 100%;
            height: 100%;
            padding: 20px;
        }

        /* ===== 字母行 ===== */
        .letters {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: clamp(4px, 2vw, 20px);
            flex-wrap: nowrap;
            perspective: 600px;
        }

        /* ===== 字母容器 ===== */
        .letter-wrapper {
            display: inline-block;
            opacity: 0;
            transform: translateY(60px) scale(0.7);
            animation: letterIn 0.9s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
            animation-delay: calc(var(--i, 0) * 0.15s + 0.2s);
        }

        /* ===== 字母 ===== */
        .letter {
            font-size: clamp(3.6rem, 16vw, 10rem);
            font-weight: 900;
            letter-spacing: 0.02em;
            display: inline-block;
            text-shadow: 0 0 12px var(--glow-color, #fff);
            animation: floatLetter 3s ease-in-out infinite;
            animation-delay: calc(var(--i, 0) * 0.2s + 0.6s);
            color: var(--letter-color, #fff);
        }

        /* 字母颜色 (保留) */
        .letter-u {
            --letter-color: #4dc9f6;
            --glow-color: #4dc9f6;
        }
        .letter-a {
            --letter-color: #f67280;
            --glow-color: #f67280;
        }
        .letter-n {
            --letter-color: #f9d976;
            --glow-color: #f9d976;
        }
        .letter-d {
            --letter-color: #6bcb77;
            --glow-color: #6bcb77;
        }
        .letter-m {
            --letter-color: #d16bff;
            --glow-color: #d16bff;
        }

        /* ===== 入场 ===== */
        @keyframes letterIn {
            0% {
                opacity: 0;
                transform: translateY(60px) scale(0.7);
            }
            100% {
                opacity: 1;
                transform: translateY(0) scale(1);
            }
        }

        /* ===== 浮动 ===== */
        @keyframes floatLetter {
            0%,
            100% {
                transform: translateY(0);
            }
            50% {
                transform: translateY(-8px);
            }
        }

        /* ===== 连接线 (简化: 无模糊) ===== */
        .connector {
            display: inline-block;
            width: clamp(10px, 3vw, 30px);
            height: 2px;
            background: linear-gradient(90deg,
                    var(--c1, #4dc9f6),
                    var(--c2, #f67280));
            border-radius: 2px;
            opacity: 0;
            animation: connectIn 0.6s ease-out forwards;
            animation-delay: calc(var(--i, 0) * 0.15s + 1.0s);
        }

        .connector-1 {
            --c1: #4dc9f6;
            --c2: #f67280;
        }
        .connector-2 {
            --c1: #f67280;
            --c2: #f9d976;
        }
        .connector-3 {
            --c1: #f9d976;
            --c2: #6bcb77;
        }
        .connector-4 {
            --c1: #6bcb77;
            --c2: #d16bff;
        }

        @keyframes connectIn {
            0% {
                opacity: 0;
                transform: scaleX(0);
            }
            100% {
                opacity: 1;
                transform: scaleX(1);
            }
        }

        /* ===== 副标题 ===== */
        .subtitle {
            margin-top: clamp(16px, 4vh, 50px);
            font-size: clamp(0.8rem, 2vw, 1.8rem);
            font-weight: 300;
            letter-spacing: 0.35em;
            color: rgba(255, 255, 255, 0.45);
            text-transform: uppercase;
            opacity: 0;
            animation: fadeUp 0.9s ease-out forwards;
            animation-delay: 2.0s;
            font-family: 'Helvetica Neue', Arial, sans-serif;
        }

        .subtitle span {
            background: linear-gradient(90deg, #4dc9f6, #d16bff);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            font-weight: 600;
        }

        @keyframes fadeUp {
            0% {
                opacity: 0;
                transform: translateY(16px);
            }
            100% {
                opacity: 1;
                transform: translateY(0);
            }
        }

        /* ===== 背景光晕 (简化) ===== */
        .hero::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            width: 70vmax;
            height: 70vmax;
            transform: translate(-50%, -50%);
            background: radial-gradient(circle at center,
                    rgba(77, 201, 246, 0.06) 0%,
                    rgba(209, 107, 255, 0.04) 40%,
                    transparent 75%);
            border-radius: 50%;
            z-index: -1;
            animation: pulseBg 8s ease-in-out infinite alternate;
            pointer-events: none;
        }

        @keyframes pulseBg {
            0% {
                transform: translate(-50%, -50%) scale(1);
                opacity: 0.5;
            }
            100% {
                transform: translate(-50%, -50%) scale(1.3);
                opacity: 0.9;
            }
        }

        /* ===== 响应式 ===== */
        @media (max-width: 600px) {
            .letters {
                gap: 2px;
            }
            .connector {
                width: 6px;
                height: 1.5px;
            }
            .letter {
                font-size: clamp(2.6rem, 12vw, 4.2rem);
            }
        }

        @media (max-width: 400px) {
            .letters {
                gap: 0;
            }
            .connector {
                width: 4px;
            }
            .letter {
                font-size: clamp(2rem, 10vw, 3rem);
            }
        }

        @media (orientation: landscape) and (max-height: 500px) {
            .letter {
                font-size: clamp(2.2rem, 10vh, 6rem);
            }
            .subtitle {
                margin-top: 8px;
                font-size: clamp(0.6rem, 1.8vh, 1.2rem);
            }
            .connector {
                width: clamp(6px, 2.5vw, 20px);
            }
        }
    </style>
</head>
<body>

    <!-- 粒子 Canvas -->
    <canvas id="particleCanvas"></canvas>

    <!-- 主内容 -->
    <div class="hero">
        <div class="letters">
            <span class="letter-wrapper" style="--i:0;">
                <span class="letter letter-u">u</span>
            </span>
            <span class="connector connector-1" style="--i:0;"></span>

            <span class="letter-wrapper" style="--i:1;">
                <span class="letter letter-a">a</span>
            </span>
            <span class="connector connector-2" style="--i:1;"></span>

            <span class="letter-wrapper" style="--i:2;">
                <span class="letter letter-n">n</span>
            </span>
            <span class="connector connector-3" style="--i:2;"></span>

            <span class="letter-wrapper" style="--i:3;">
                <span class="letter letter-d">d</span>
            </span>
            <span class="connector connector-4" style="--i:3;"></span>

            <span class="letter-wrapper" style="--i:4;">
                <span class="letter letter-m">m</span>
            </span>
        </div>

        <div class="subtitle">
            <span>you &amp; me</span> &nbsp;·&nbsp; 此刻相遇
        </div>
    </div>

    <script>
        // ============================================================
        //  轻量粒子系统 —— 大幅简化，降低 CPU 负载
        // ============================================================

        const canvas = document.getElementById('particleCanvas');
        const ctx = canvas.getContext('2d');
        let W, H;

        let particles = [];
        const MAX_PARTICLES = 100; // 从 280 → 100
        let frameCount = 0;

        // ---------- 获取字母位置 ----------
        function getLetterPositions() {
            const wrappers = document.querySelectorAll('.letter-wrapper');
            const positions = [];
            wrappers.forEach((wrapper) => {
                const rect = wrapper.getBoundingClientRect();
                const cx = rect.left + rect.width / 2;
                const cy = rect.top + rect.height / 2;
                const letterEl = wrapper.querySelector('.letter');
                let color = '#4dc9f6';
                if (letterEl) {
                    const computed = getComputedStyle(letterEl);
                    color = computed.getPropertyValue('--letter-color').trim() || '#4dc9f6';
                }
                positions.push({ x: cx, y: cy, color });
            });
            return positions;
        }

        // ---------- 粒子类 (无拖尾，无阴影，极简) ----------
        class Particle {
            constructor(x, y, color) {
                this.x = x;
                this.y = y;
                const angle = Math.random() * Math.PI * 2;
                const speed = 0.6 + Math.random() * 1.8;
                this.vx = Math.cos(angle) * speed;
                this.vy = Math.sin(angle) * speed - 0.4;
                this.size = 1.5 + Math.random() * 3.5;
                this.life = 1;
                this.decay = 0.008 + Math.random() * 0.018;
                this.color = color;
                this.alpha = 0.8 + Math.random() * 0.2;
            }

            update() {
                this.vx *= 0.995;
                this.vy += 0.03;
                this.x += this.vx;
                this.y += this.vy;
                this.life -= this.decay;
                this.alpha = this.life * 0.8 + 0.2;
                this.size *= 0.998;
            }

            draw(ctx) {
                if (this.life <= 0 || this.size < 0.3) return;

                const a = Math.min(this.alpha, 1);
                ctx.globalAlpha = a;
                ctx.beginPath();
                ctx.arc(this.x, this.y, this.size, 0, Math.PI * 2);
                ctx.fillStyle = this.color;
                ctx.fill();
                ctx.globalAlpha = 1;
            }

            isDead() {
                return this.life <= 0 || this.size < 0.3 ||
                    this.y > H + 30 || this.x < -30 || this.x > W + 30;
            }
        }

        // ---------- Canvas 尺寸 ----------
        function resizeCanvas() {
            W = window.innerWidth;
            H = window.innerHeight;
            canvas.width = W;
            canvas.height = H;
        }

        // ---------- 发射粒子 ----------
        function emitParticles(count) {
            const positions = getLetterPositions();
            if (positions.length === 0) return;
            for (let i = 0; i < count; i++) {
                const pos = positions[Math.floor(Math.random() * positions.length)];
                const p = new Particle(
                    pos.x + (Math.random() - 0.5) * 24,
                    pos.y + (Math.random() - 0.5) * 24,
                    pos.color
                );
                const angle = Math.random() * Math.PI * 2;
                const speed = 0.4 + Math.random() * 2.0;
                p.vx = Math.cos(angle) * speed;
                p.vy = Math.sin(angle) * speed - 0.5;
                p.size = 1.2 + Math.random() * 3.2;
                particles.push(p);
            }
            if (particles.length > MAX_PARTICLES * 1.6) {
                particles = particles.slice(-MAX_PARTICLES);
            }
        }

        // ---------- 清理 ----------
        function cleanParticles() {
            particles = particles.filter(p => !p.isDead());
            if (particles.length > MAX_PARTICLES) {
                particles = particles.slice(0, MAX_PARTICLES);
            }
        }

        // ---------- 背景星星 (极少) ----------
        let stars = [];

        function initStars() {
            const count = 35; // 从 60 → 35
            for (let i = 0; i < count; i++) {
                stars.push({
                    x: Math.random() * W,
                    y: Math.random() * H,
                    size: 0.4 + Math.random() * 1.2,
                    speed: 0.004 + Math.random() * 0.012,
                    phase: Math.random() * Math.PI * 2,
                    alpha: 0.15 + Math.random() * 0.35,
                });
            }
        }

        function drawStars() {
            const time = Date.now() * 0.001;
            for (const s of stars) {
                const flicker = 0.5 + 0.5 * Math.sin(time * s.speed * 2 + s.phase);
                const alpha = s.alpha * flicker * 0.6;
                ctx.globalAlpha = alpha;
                ctx.beginPath();
                ctx.arc(s.x, s.y, s.size * (0.6 + 0.4 * flicker), 0, Math.PI * 2);
                ctx.fillStyle = '#fff';
                ctx.fill();
            }
            ctx.globalAlpha = 1;
        }

        // ---------- 主动画循环 ----------
        function animate() {
            frameCount++;

            // 每 2 帧发射一次，减少计算
            if (frameCount % 2 === 0 && particles.length < MAX_PARTICLES) {
                if (Math.random() < 0.25) {
                    emitParticles(1 + (Math.random() < 0.3 ? 1 : 0));
                }
            }

            for (const p of particles) {
                p.update();
            }
            cleanParticles();

            ctx.clearRect(0, 0, W, H);

            // 画星星
            drawStars();

            // 画粒子
            for (const p of particles) {
                p.draw(ctx);
            }

            requestAnimationFrame(animate);
        }

        // ---------- 窗口变化 ----------
        window.addEventListener('resize', () => {
            resizeCanvas();
            stars = [];
            initStars();
        });

        // ---------- 点击 / 触摸 爆发 (保留但减少数量) ----------
        function burstParticles(x, y) {
            const count = 6 + Math.floor(Math.random() * 10); // 从 12-16 → 6-10
            const colors = ['#4dc9f6', '#f67280', '#f9d976', '#6bcb77', '#d16bff'];
            for (let i = 0; i < count; i++) {
                const p = new Particle(
                    x + (Math.random() - 0.5) * 40,
                    y + (Math.random() - 0.5) * 40,
                    colors[Math.floor(Math.random() * colors.length)]
                );
                const angle = Math.random() * Math.PI * 2;
                const speed = 0.8 + Math.random() * 3;
                p.vx = Math.cos(angle) * speed;
                p.vy = Math.sin(angle) * speed - 0.8;
                p.size = 1.5 + Math.random() * 4;
                p.decay = 0.01 + Math.random() * 0.015;
                particles.push(p);
            }
            if (particles.length > MAX_PARTICLES * 1.6) {
                particles = particles.slice(-MAX_PARTICLES);
            }
        }

        document.addEventListener('click', (e) => {
            burstParticles(e.clientX, e.clientY);
        });

        document.addEventListener('touchstart', (e) => {
            const touch = e.touches[0];
            if (touch) {
                burstParticles(touch.clientX, touch.clientY);
            }
        }, { passive: true });

        // ---------- 启动 ----------
        function init() {
            resizeCanvas();
            initStars();
            // 初始粒子
            for (let i = 0; i < 30; i++) {
                setTimeout(() => {
                    emitParticles(1 + Math.floor(Math.random() * 2));
                }, i * 20);
            }
            animate();
        }

        if (document.readyState === 'complete') {
            init();
        } else {
            window.addEventListener('load', init);
        }

        console.log('✨ uandm · 轻量开屏已加载 (CPU 优化版)');
    </script>

</body>
</html>