@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@700&display=swap');

:root {
    --bg-color: #0f172a;
    --panel-bg: rgba(30, 41, 59, 0.85);
    --text-main: #f1f5f9;
    --input-bg: #0f172a;
    --border-color: #334155;
}

.light-mode {
    --bg-color: #f8fafc;
    --panel-bg: rgba(255, 255, 255, 0.9);
    --text-main: #1e293b;
    --input-bg: #ffffff;
    --border-color: #e2e8f0;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: 'Noto+Sans+JP', sans-serif;
    overflow: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.wave-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-content: center;
    min-height: 100vh;
    padding: 20px;
    perspective: 1000px;
}

.wave-char-wrapper {
    display: inline-block;
    white-space: pre;
    transform: rotate(var(--char-rotate));
}

.wave-char {
    display: inline-block;
    animation-duration: var(--duration);
    animation-timing-function: ease-in-out;
    animation-iteration-count: infinite;
    animation-delay: var(--delay);
    transform-origin: center center;
}

.wave-vertical {
    animation-name: wave-v;
}

.wave-horizontal {
    animation-name: wave-h;
}

.wave-diagonal {
    animation-name: wave-d;
}

@keyframes wave-v {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(var(--amplitude));
    }
}

@keyframes wave-h {

    0%,
    100% {
        transform: translateX(0);
    }

    50% {
        transform: translateX(var(--amplitude));
    }
}

@keyframes wave-d {

    0%,
    100% {
        transform: translate(0, 0);
    }

    50% {
        transform: translate(var(--amplitude), var(--amplitude));
    }
}

.control-panel {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    width: 95%;
    max-width: 700px;
    z-index: 50;
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.5s ease;
}

.control-panel.hidden-panel {
    transform: translateX(-50%) translateY(150%);
    opacity: 0;
    pointer-events: none;
}

.floating-buttons {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    z-index: 100;
}

.action-btn {
    width: 3.5rem;
    height: 3.5rem;
    border-radius: 9999px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transition: all 0.2s;
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(8px);
}

.action-btn:hover {
    transform: scale(1.1);
}

.number-input {
    width: 70px;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 2px 6px;
    text-align: center;
    font-size: 0.875rem;
}

input[type="range"] {
    accent-color: #06b6d4;
}

select {
    background-color: var(--input-bg);
    color: var(--text-main);
    border: 1px solid var(--border-color);
}