/*
  Base CSS
  - Reset overrides
  - Typography
  - Common Layout
  - Common Animations
*/

html {
    scroll-behavior: smooth;
}

body {
    font-family: "Noto Serif JP", serif;
    color: #4a3b3b;
    line-height: 1.6;
    overflow-x: hidden;
}

/* Links */
a {
    text-decoration: none;
    color: inherit;
    transition: opacity 0.3s;
}

a:hover {
    opacity: 0.7;
}

/* Lists */
ul {
    list-style: none;
}

/* Typography */
h1,
h2,
h3 {
    font-weight: 500;
    letter-spacing: 0.05em;
}

/* Common Layout */
.section {
    position: relative;
    padding: 100px 0;
}

.section-inner {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 40px;
    position: relative;
}

/* Common Animations */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 1s ease-out, transform 1s ease-out;
}

.slide-in-left {
    opacity: 0;
    transform-origin: left center;
    transform: translateX(-50px);
    transition: opacity 1s ease-out, transform 1.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.slide-in-right {
    opacity: 0;
    transform-origin: right center;
    transform: translateX(50px);
    transition: opacity 1s ease-out, transform 1.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.fade-in.visible,
.slide-in-left.visible,
.slide-in-right.visible {
    opacity: 1;
    transform: translate(0) rotate(0);
}

/* Sakura Petals Animation */
#sakura-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    pointer-events: none;
    z-index: 9999;
    transition: opacity 0.5s ease;
}

#sakura-container.hidden {
    opacity: 0;
}

.petal {
    position: absolute;
    background: url("../images/sakura-petal.png") no-repeat center center/cover;
    filter: blur(1px);
    animation: animate-petal linear infinite;
}

@keyframes animate-petal {
    0% {
        opacity: 0.2;
        top: -10%;
        transform: translateX(0) rotateX(0deg) rotateY(0deg) rotateZ(0deg);
    }

    10% {
        opacity: 0.5;
        filter: blur(0.5px);
    }

    50% {
        opacity: 0.8;
        transform: translateX(50px) rotateX(180deg) rotateY(90deg) rotateZ(180deg);
        filter: blur(2px);
    }

    100% {
        opacity: 0.2;
        top: 100%;
        transform: translateX(120px) rotateX(360deg) rotateY(360deg) rotateZ(720deg);
        filter: blur(1px);
    }
}