:root {
    --bg-color: #ffffff;
    --text-color: #1a1a1a;
    --logo-color: #1a1a1a;
    --btn-bg: #f0f0f0;
    --btn-text: #1a1a1a;
    --btn-hover-bg: #e0e0e0;
    --ui-bg: rgba(255, 255, 255, 0.85);
    --slider-track: #d3d3d3;
    --slider-thumb: #666666;
    --accent-color: #007aff;
    --nav-active-bg: rgba(0, 122, 255, 0.1);
}

[data-theme="dark"] {
    --bg-color: #000000;
    --text-color: #f0f0f0;
    --logo-color: #f0f0f0;
    --btn-bg: #2c2c2e;
    --btn-text: #f0f0f0;
    --btn-hover-bg: #3a3a3c;
    --ui-bg: rgba(28, 28, 30, 0.85);
    --slider-track: #444;
    --slider-thumb: #ccc;
    --accent-color: #0a84ff;
    --nav-active-bg: rgba(10, 132, 255, 0.2);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent; /* スマホでのタップ時のハイライトを消す */
}

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
    -webkit-touch-callout: none; /* 長押し時のメニューを無効化 */
    -webkit-user-select: none;   /* テキスト選択を無効化 */
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

#app-container {
    width: 100%;
    height: 100%;
    position: relative;
}

.screen {
    display: none;
    width: 100%;
    height: 100%;
    flex-direction: column;
}
.screen.active {
    display: flex;
}

/* ======== テーマ切り替えボタン ======== */

#theme-toggle-btn, #download-btn {
    background: var(--btn-bg);
    border-radius: 50%;
    width: 44px;
    height: 44px;
    padding: 10px;
    opacity: 0.7;
    border: none;
    cursor: pointer;
    transition: opacity 0.2s;
    position: fixed;
    top: 15px;
    z-index: 1000;
}
#theme-toggle-btn {
    left: 15px;
}
#download-btn {
    right: 15px;
}
#theme-toggle-btn:hover, #download-btn:hover {
    opacity: 1;
}

/* ======== アイコン共通スタイル ======== */
.icon {
    width: 100%;
    height: 100%;
    color: var(--text-color);
    transition: color 0.3s;
}

/* ======== インポート画面 ======== */
#import-screen {
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.import-content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 100%;
}

#logo {
    width: 200px;
    height: 40px;
    color: var(--logo-color);
    margin-bottom: 20px;
    transition: color 0.3s;
}

.drag-drop-text {
    color: var(--text-color);
    opacity: 0.6;
}

.import-buttons {
    width: 100%;
    max-width: 350px;
    padding-bottom: 30px;
}

.main-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: 15px;
    font-size: 16px;
    background-color: var(--btn-bg);
    color: var(--btn-text);
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: background-color 0.2s;
    margin-top: 15px;
}
.main-btn:hover {
    background-color: var(--btn-hover-bg);
}
.main-btn .icon {
    width: 24px;
    height: 24px;
    margin-right: 12px;
}

/* ドラッグオーバー時のスタイル */
#import-screen.drag-over {
    background-color: var(--accent-color);
}
#import-screen.drag-over .drag-drop-text,
#import-screen.drag-over #logo {
    color: white;
}

/* ======== 編集画面 ======== */
#edit-screen {
    background-color: var(--bg-color);
    transition: background-color 0.3s;
}

#canvas-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    cursor: grab;
}

#canvas-container canvas {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    max-width: 100vw;
    max-height: 100vh;
    transition: all 0.3s ease-in-out;
}

#edit-ui {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    z-index: 10;
    background-color: var(--ui-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: opacity 0.3s, visibility 0.3s, background-color 0.3s;
    padding-bottom: env(safe-area-inset-bottom); /* iOSのノッチ対応 */
}

#edit-ui.hidden {
    opacity: 0;
    visibility: hidden;
}

/* メインナビゲーション */
#main-nav {
    display: flex;
    justify-content: space-around;
    padding: 10px 0;
    border-top: 1px solid rgba(128, 128, 128, 0.2);
}

.nav-btn {
    display: flex;
    align-items: center;
    background: none;
    border: none;
    color: var(--text-color);
    padding: 5px 15px;
    cursor: pointer;
    border-radius: 8px;
    font-size: 14px;
}
.nav-btn .icon {
    width: 20px;
    height: 20px;
    margin-right: 8px;
}
.nav-btn.active {
    background-color: var(--nav-active-bg);
    color: var(--accent-color);
}
.nav-btn.active .icon {
    color: var(--accent-color);
}

/* サブナビゲーション */
#sub-nav-container {
    padding: 15px 0;
    overflow-x: auto;
    white-space: nowrap;
}
#sub-nav-container::-webkit-scrollbar {
    display: none; /* スクロールバー非表示 */
}

.sub-nav {
    display: flex;
    padding: 0 15px;
}

.sub-nav-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: none;
    border: none;
    color: var(--text-color);
    cursor: pointer;
    padding: 5px;
    border-radius: 8px;
    width: 80px;
    flex-shrink: 0;
}
.sub-nav-btn .icon {
    width: 28px;
    height: 28px;
    margin-bottom: 5px;
}
.sub-nav-btn span {
    font-size: 12px;
}
.sub-nav-btn.active {
    color: var(--accent-color);
}
.sub-nav-btn.edited {
    color: var(--accent-color);
    font-weight: bold;
}

/* パラメータ操作UI */
.param-controls {
    padding: 15px;
    max-height: 250px;
    overflow-y: auto;
}

.param-item {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
}

.param-preview {
    width: 40px;
    height: 40px;
    background: #ccc;
    border-radius: 4px;
    margin-right: 15px;
    flex-shrink: 0;
    position: relative;
    overflow: hidden;
}
.param-preview canvas {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.slider-container {
    flex-grow: 1;
    margin-right: 15px;
}
.slider-container .param-label {
    font-size: 14px;
    margin-bottom: 5px;
}
input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 4px;
    background: var(--slider-track);
    border-radius: 2px;
    outline: none;
    cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    background: var(--slider-thumb);
    border-radius: 50%;
    border: 3px solid var(--bg-color);
    box-shadow: 0 0 5px rgba(0,0,0,0.2);
    cursor: grab;
}
input[type="range"]::-moz-range-thumb {
    width: 24px;
    height: 24px;
    background: var(--slider-thumb);
    border-radius: 50%;
    border: 3px solid var(--bg-color);
    box-shadow: 0 0 5px rgba(0,0,0,0.2);
    cursor: grab;
}

.param-value {
    width: 50px;
    padding: 5px;
    font-size: 14px;
    text-align: center;
    background: var(--btn-bg);
    border: 1px solid var(--slider-track);
    color: var(--text-color);
    border-radius: 5px;
}

/* ボタン汎用 */
.icon-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
}

/* スマホ用レイアウト調整 */
@media (max-width: 600px) {
    .nav-btn {
        flex-direction: column;
        font-size: 10px;
        padding: 5px;
    }
    .nav-btn .icon {
        margin-right: 0;
        margin-bottom: 2px;
    }
}