/* HTTP/1.1 vs HTTP/2 비교 테스트 전용 스타일 */
:root {
	--bg-gradient: radial-gradient(circle at 50% 50%, #f8fafc 0%, #f1f5f9 100%);
	--text-primary: #0f172a;
	--text-secondary: #475569;
	--accent: #4f46e5;
	--accent-hover: #4338ca;
	--card-bg: rgba(255, 255, 255, 0.75);
	--card-border: rgba(99, 102, 241, 0.12);
	--shadow: 0 20px 40px -15px rgba(99, 102, 241, 0.05), 0 0 0 1px rgba(99, 102, 241, 0.01);
}

body.bg-3d-active {
	--bg-gradient: radial-gradient(circle at 50% 50%, #0d0f28 0%, #04050a 100%);
	--text-primary: #f8fafc;
	--text-secondary: #94a3b8;
	--accent: #8b5cf6;
	--accent-hover: #7c3aed;
	--card-bg: rgba(10, 11, 26, 0.5);
	--card-border: rgba(139, 92, 246, 0.15);
	--shadow: 0 30px 70px -15px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(255, 255, 255, 0.03);
}

* {
	box-sizing: border-box;
	margin: 0;
	padding: 0;
	font-family: 'Plus Jakarta Sans', -apple-system, sans-serif;
}

body {
	background: var(--bg-gradient);
	color: var(--text-primary);
	min-height: 100vh;
	display: flex;
	align-items: center;
	justify-content: center;
	padding: 2rem 1.5rem;
	transition: background 0.3s ease, color 0.3s ease;
	flex-direction: column;
	height: auto;
	justify-content: flex-start;
}

.container {
	width: 100%;
	max-width: 860px;
	margin: 0 auto;
	display: flex;
	flex-direction: column;
	gap: 1.5rem;
}

.glass-card {
	background: var(--card-bg);
	border: 1px solid var(--card-border);
	box-shadow: var(--shadow);
	border-radius: 24px;
	padding: 2.5rem;
	backdrop-filter: blur(20px);
	-webkit-backdrop-filter: blur(20px);
	display: flex;
	flex-direction: column;
	gap: 2rem;
	transition: all 0.3s ease;
	margin-bottom: 2rem;
	width: 100%;
	max-width: 100% !important; /* intro.css의 44rem 제한 오버라이드 */
}

.header-section {
	text-align: center;
	display: flex;
	flex-direction: column;
	gap: 0.5rem;
}

.title-gradient {
	font-size: 2rem;
	font-weight: 800;
	background: linear-gradient(135deg, var(--accent) 0%, #ec4899 100%);
	-webkit-background-clip: text;
	-webkit-text-fill-color: transparent;
	letter-spacing: -0.03em;
}

.subtitle {
	font-size: 0.95rem;
	color: var(--text-secondary);
}

/* 설정 옵션 패널 */
.config-panel {
	display: grid;
	grid-template-columns: repeat(2, 1fr);
	gap: 1.5rem;
	background: rgba(99, 102, 241, 0.03);
	border: 1px solid var(--card-border);
	padding: 1.25rem;
	border-radius: 18px;
}

.config-item {
	display: flex;
	flex-direction: column;
	gap: 0.5rem;
}

.config-label {
	font-size: 0.85rem;
	font-weight: 600;
	color: var(--text-primary);
}

.config-select {
	padding: 0.75rem;
	border-radius: 12px;
	border: 1px solid var(--card-border);
	background: var(--card-bg);
	color: var(--text-primary);
	font-size: 0.9rem;
	font-weight: 500;
	outline: none;
	cursor: pointer;
	transition: border-color 0.2s;
}

.config-select:focus {
	border-color: var(--accent);
}

/* HUD 대시보드 */
.hud-grid {
	display: grid;
	grid-template-columns: repeat(3, 1fr);
	gap: 1rem;
}

.hud-item {
	background: rgba(99, 102, 241, 0.04);
	border: 1px solid var(--card-border);
	border-radius: 16px;
	padding: 1rem;
	text-align: center;
	display: flex;
	flex-direction: column;
	gap: 0.25rem;
}

.hud-label {
	font-size: 0.75rem;
	font-weight: 600;
	text-transform: uppercase;
	color: var(--text-secondary);
	letter-spacing: 0.05em;
}

.hud-value {
	font-size: 1.35rem;
	font-weight: 700;
	color: var(--accent);
}

.hud-value.protocol {
	color: #06b6d4;
}

/* 이미지 격자판 */
.grid-wrapper {
	border: 1px solid var(--card-border);
	border-radius: 16px;
	background: rgba(0, 0, 0, 0.02);
	padding: 1.25rem;
	display: flex;
	justify-content: center;
	align-items: center;
	min-height: 250px;
}

.image-grid {
	display: grid;
	grid-template-columns: repeat(20, 1fr);
	gap: 4px;
	width: 100%;
	max-width: 680px;
}

.tile {
	aspect-ratio: 1 / 1;
	background: rgba(99, 102, 241, 0.08);
	border-radius: 4px;
	overflow: hidden;
	display: flex;
	align-items: center;
	justify-content: center;
	font-size: 0.5rem;
	color: transparent;
	border: 1px solid var(--card-border);
	transition: transform 0.2s, background-color 0.2s;
}

.tile img {
	width: 100%;
	height: 100%;
	object-fit: cover;
	display: block;
	opacity: 0;
	transition: opacity 0.1s ease-in;
}

.tile img.loaded {
	opacity: 1;
}

/* 컨트롤 버튼 */
.action-section {
	display: flex;
	justify-content: center;
	gap: 1rem;
}

.btn {
	padding: 0.85rem 2rem;
	border-radius: 14px;
	font-weight: 600;
	font-size: 0.95rem;
	cursor: pointer;
	border: none;
	transition: all 0.2s;
	display: inline-flex;
	align-items: center;
	gap: 0.5rem;
}

.btn-primary {
	background: var(--accent);
	color: white;
	box-shadow: 0 10px 20px -5px rgba(99, 102, 241, 0.25);
}

.btn-primary:hover:not(:disabled) {
	background: var(--accent-hover);
	transform: translateY(-2px);
	box-shadow: 0 12px 22px -4px rgba(99, 102, 241, 0.35);
}

.btn-primary:disabled {
	opacity: 0.5;
	cursor: not-allowed;
}

.btn-secondary {
	background: rgba(99, 102, 241, 0.08);
	color: var(--text-primary);
	border: 1px solid var(--card-border);
}

.btn-secondary:hover {
	background: rgba(99, 102, 241, 0.15);
}

/* 설명 카드 */
.info-card {
	background: rgba(99, 102, 241, 0.02);
	border: 1px dashed var(--card-border);
	border-radius: 16px;
	padding: 1.25rem;
	font-size: 0.85rem;
	line-height: 1.5;
	color: var(--text-secondary);
	display: flex;
	flex-direction: column;
	gap: 0.5rem;
}

.info-title {
	font-weight: 600;
	color: var(--text-primary);
	display: flex;
	align-items: center;
	gap: 0.5rem;
}

/* 하단 액션 및 홈 링크 (공통화) */
.actions {
	margin-top: 1rem;
	margin-bottom: 3rem;
	text-align: center;
	width: 100%;
}

.link-home {
	color: var(--text-secondary);
	text-decoration: none;
	font-size: 0.95rem;
	font-weight: 500;
	transition: all 0.25s ease;
	opacity: 0.7;
}

.link-home:hover {
	color: var(--accent);
	opacity: 1;
	text-decoration: underline;
}

/* 프로토콜 스위처 */
.protocol-switcher-section {
	display: flex;
	flex-direction: column;
	align-items: center;
	gap: 0.75rem;
	margin-bottom: 0.5rem;
}

.switcher-title {
	font-size: 0.85rem;
	font-weight: 600;
	color: var(--text-secondary);
	letter-spacing: -0.01em;
}

.segmented-control {
	display: flex;
	background: rgba(99, 102, 241, 0.05);
	border: 1px solid var(--card-border);
	padding: 4px;
	border-radius: 16px;
	width: 100%;
	max-width: 480px;
	box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.02);
}

.switch-btn {
	flex: 1;
	display: flex;
	align-items: center;
	justify-content: center;
	gap: 0.5rem;
	padding: 0.75rem 1rem;
	border-radius: 12px;
	border: none;
	background: transparent;
	font-size: 0.9rem;
	font-weight: 700;
	color: var(--text-secondary);
	cursor: pointer;
	transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.switch-btn:hover {
	color: var(--text-primary);
}

/* 활성화된 버튼 스타일 */
.switch-btn.active {
	background: #ffffff;
	color: var(--accent);
	box-shadow: 0 4px 12px rgba(99, 102, 241, 0.12), 0 0 1px rgba(99, 102, 241, 0.05);
}

/* 다크모드 대응 활성화 버튼 */
body.bg-3d-active .switch-btn.active {
	background: rgba(255, 255, 255, 0.1);
	color: #a78bfa;
	box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

/* 텍스트 전송 암호화 테스트 패널 */
.text-test-panel {
	background: rgba(99, 102, 241, 0.03);
	border: 1px solid var(--card-border);
	border-radius: 18px;
	padding: 1.5rem;
	display: flex;
	flex-direction: column;
	gap: 1rem;
}

.text-test-title {
	font-size: 0.95rem;
	font-weight: 700;
	color: var(--text-primary);
	display: flex;
	align-items: center;
	gap: 0.5rem;
}

.text-test-form {
	display: flex;
	gap: 0.75rem;
	align-items: center;
}

.input-group {
	flex: 1;
	display: flex;
	align-items: center;
	gap: 0.5rem;
	border: 1px solid var(--card-border);
	background: var(--card-bg);
	border-radius: 12px;
	padding: 0.25rem 0.75rem;
}

.input-label {
	font-size: 0.9rem;
	font-weight: 700;
	color: var(--text-secondary);
}

.text-input {
	flex: 1;
	border: none;
	background: transparent;
	padding: 0.5rem 0.25rem;
	font-size: 0.95rem;
	color: var(--text-primary);
	outline: none;
}

.send-btn {
	padding: 0.75rem 1.5rem !important;
	border-radius: 12px !important;
	font-weight: 600 !important;
}

.text-test-result {
	font-size: 0.85rem;
	color: var(--text-secondary);
}

.result-value {
	color: #10b981;
	font-weight: 700;
}