@charset "UTF-8";

		/* -----------------------------------------------------------------
		   CSS Variables
		   ----------------------------------------------------------------- */
		:root {
			--head_color: #524C42;
			--back_color: #706C65;
			--pop_color: #D6C6A9;
			--tab_color: #AEAEAE;
			--font_light_color: #D7D7D7;
			--font_dark_color: #7B6464;
			--font_tab_color: #7B7B7B;
			--icon_red_color: #CE6B6B;
			--icon_red_hover_color: #C73333;
			--icon_blue_color: #47ACD2;
			--icon_blue_hover_color: #4171C8;
			--btn_perple_color: #9F58B1;
			--btn_perple_hover: #8e4da0;
			--fukidashi_color: #333333;
			--border-radius: 12px;
			--shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
		}

		/* -----------------------------------------------------------------
		   Reset & Base Styles
		   ----------------------------------------------------------------- */
		*, *::before, *::after {
			box-sizing: border-box;
			margin: 0;
			padding: 0;
		}

		body {
			font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
			background-color: var(--back_color);
			color: var(--font_light_color);
			line-height: 1.6;
			min-height: 100vh;
			display: flex;
			flex-direction: column;
		}

		/* -----------------------------------------------------------------
		   Layout Components
		   ----------------------------------------------------------------- */
		.header {
			background-color: var(--head_color);
			padding: 1.5rem 2rem;
			text-align: center;
			box-shadow: 0 4px 12px rgba(0,0,0,0.1);
		}

		.header h1 {
			font-size: 1.5rem;
			letter-spacing: 0.05em;
			color: var(--pop_color);
		}

		/* Tab Navigation */
		.nav-tabs {
			display: flex;
			justify-content: center;
			gap: 1rem;
			margin-top: 1.5rem;
		}

		.tab-btn {
			background-color: transparent;
			border: 2px solid var(--pop_color);
			color: var(--pop_color);
			padding: 0.5rem 1.5rem;
			border-radius: 20px;
			cursor: pointer;
			font-weight: bold;
			transition: all 0.3s ease;
		}

		.tab-btn:hover {
			background-color: rgba(214, 198, 169, 0.1);
		}

		.tab-btn.active {
			background-color: var(--pop_color);
			color: var(--head_color);
		}

		.main-container {
			flex: 1;
			width: 100%;
			max-width: 1200px;
			margin: 0 auto;
			padding: 2rem;
			/* Grid Layout is applied to content wrappers */
		}

		/* -----------------------------------------------------------------
		   Tab Content Control
		   ----------------------------------------------------------------- */
		.tab-content {
			display: none;
			animation: fadeIn 0.4s ease;
		}

		.tab-content.active {
			display: grid;
			gap: 2rem;
			grid-template-rows: auto auto;
		}

		@keyframes fadeIn {
			from { opacity: 0; transform: translateY(10px); }
			to { opacity: 1; transform: translateY(0); }
		}

		/* -----------------------------------------------------------------
		   Tool Wrapper (Common)
		   ----------------------------------------------------------------- */
		.tool-wrapper {
			background-color: var(--head_color);
			padding: 2rem;
			border-radius: var(--border-radius);
			box-shadow: var(--shadow);
		}

		/* Entity Tool Specific Grid */
		.entity-grid {
			display: grid;
			grid-template-columns: 1fr 80px 1fr;
			gap: 1.5rem;
			align-items: center;
		}

		/* Favicon Tool Specific Styles */
		.favicon-layout {
			display: flex;
			flex-direction: column;
			gap: 2rem;
			align-items: center;
			text-align: center;
		}

		.upload-area {
			border: 3px dashed var(--tab_color);
			border-radius: var(--border-radius);
			padding: 2rem;
			width: 100%;
			max-width: 600px;
			background-color: rgba(255,255,255,0.05);
			transition: border-color 0.3s;
			display: flex;
			flex-direction: column;
			align-items: center;
			gap: 1rem;
		}

		.upload-area:hover {
			border-color: var(--pop_color);
		}

		input[type="file"] {
			display: none;
		}

		.file-select-btn {
			background-color: var(--tab_color);
			color: var(--fukidashi_color);
			padding: 0.8rem 2rem;
			border-radius: 8px;
			cursor: pointer;
			font-weight: bold;
			transition: background 0.3s;
		}

		.file-select-btn:hover {
			background-color: #d0d0d0;
		}

		.preview-area {
			display: flex;
			gap: 1rem;
			flex-wrap: wrap;
			justify-content: center;
			margin-top: 1rem;
			min-height: 80px;
		}

		.preview-item {
			display: flex;
			flex-direction: column;
			align-items: center;
			gap: 0.5rem;
		}

		.preview-item img {
			background-color: #fff; /* 透明背景確認用 */
			image-rendering: pixelated;
			box-shadow: 0 2px 5px rgba(0,0,0,0.2);
		}

		.preview-item span {
			font-size: 0.8rem;
			color: var(--tab_color);
		}

		.btn-generate {
			background-color: var(--btn_perple_color);
			color: #fff;
			font-size: 1.2rem;
			padding: 1rem 3rem;
			border: none;
			border-radius: 50px;
			cursor: pointer;
			font-weight: bold;
			box-shadow: 0 4px 10px rgba(0,0,0,0.3);
			transition: all 0.3s ease;
			margin-top: 1rem;
		}

		.btn-generate:hover {
			background-color: var(--btn_perple_hover);
			transform: translateY(-2px);
		}

		.btn-generate:disabled {
			background-color: var(--tab_color);
			cursor: not-allowed;
			transform: none;
		}

		.btn-download {
			background-color: var(--icon_red_color);
			text-decoration: none;
			display: none; /* 初期は非表示 */
			align-items: center;
			justify-content: center;
		}

		.btn-download:hover {
			background-color: var(--icon_red_hover_color);
			transform: translateY(-2px);
		}

		/* -----------------------------------------------------------------
		   Common Form Elements
		   ----------------------------------------------------------------- */
		.input-group {
			display: flex;
			flex-direction: column;
			height: 100%;
		}

		.label-text {
			font-size: 0.9rem;
			color: var(--tab_color);
			margin-bottom: 0.5rem;
			font-weight: bold;
		}

		.text-area {
			width: 100%;
			height: 250px;
			padding: 1rem;
			font-size: 1rem;
			font-family: monospace;
			background-color: #fcfcfc;
			color: var(--font_dark_color);
			border: 2px solid var(--tab_color);
			border-radius: 8px;
			resize: none;
			transition: border-color 0.3s ease, box-shadow 0.3s ease;
		}

		.text-area:focus {
			outline: none;
			border-color: var(--icon_blue_color);
			box-shadow: 0 0 0 3px rgba(71, 172, 210, 0.2);
		}

		/* Controls */
		.controls {
			display: flex;
			flex-direction: column;
			gap: 1rem;
			justify-content: center;
			align-items: center;
		}

		.btn-arrow {
			width: 60px;
			height: 60px;
			border: none;
			border-radius: 50%;
			cursor: pointer;
			display: flex;
			justify-content: center;
			align-items: center;
			font-size: 1.5rem;
			color: #fff;
			transition: transform 0.2s ease, background-color 0.3s ease;
			box-shadow: 0 4px 6px rgba(0,0,0,0.15);
		}

		.btn-arrow:active {
			transform: scale(0.95);
		}

		.btn-encode {
			background-color: var(--icon_blue_color);
		}
		.btn-encode:hover {
			background-color: var(--icon_blue_hover_color);
		}

		.btn-decode {
			background-color: var(--icon_red_color);
		}
		.btn-decode:hover {
			background-color: var(--icon_red_hover_color);
		}

		/* -----------------------------------------------------------------
		   Visual Section
		   ----------------------------------------------------------------- */
		.visual-section {
			display: grid;
			grid-template-columns: 1fr 1fr;
			gap: 2rem;
			margin-top: 1rem;
		}

		.info-box {
			background-color: rgba(0,0,0,0.2);
			padding: 1.5rem;
			border-radius: var(--border-radius);
			color: var(--pop_color);
		}

		.info-box h2 {
			font-size: 1.2rem;
			margin-bottom: 1rem;
			border-bottom: 1px solid var(--tab_color);
			padding-bottom: 0.5rem;
		}

		.info-box p {
			font-size: 0.95rem;
			color: var(--font_light_color);
			margin-bottom: 1rem;
		}

		.work-img-wrapper {
			width: 100%;
			height: 100%;
			border-radius: var(--border-radius);
			overflow: hidden;
			box-shadow: var(--shadow);
		}

		.work-img {
			width: 100%;
			height: 100%;
			object-fit: cover;
			display: block;
			transition: transform 0.5s ease;
		}

		.work-img:hover {
			transform: scale(1.03);
		}

		/* -----------------------------------------------------------------
		   Responsive Design
		   ----------------------------------------------------------------- */
		@media (max-width: 900px) {
			.entity-grid {
				grid-template-columns: 1fr;
				grid-template-rows: auto auto auto;
				gap: 1rem;
			}

			.controls {
				flex-direction: row;
				gap: 2rem;
				padding: 1rem 0;
			}

			.btn-arrow {
				width: 100%;
				max-width: 200px;
				height: 50px;
				border-radius: 8px;
			}

			.btn-encode::after { content: "変換する"; font-size: 1rem; margin-left: 10px; }
			.btn-decode::after { content: "戻す"; font-size: 1rem; margin-left: 10px; }

			.visual-section {
				grid-template-columns: 1fr;
			}

			.nav-tabs {
				flex-direction: column;
				align-items: center;
				gap: 0.5rem;
			}

			.tab-btn {
				width: 100%;
				max-width: 300px;
				text-align: center;
			}
		}

		footer {
			text-align: center;
			padding: 2rem;
			font-size: 0.8rem;
			color: var(--tab_color);
			margin-top: auto;
		}