:root {
    --bg-0: #040608;
    --bg-1: #0c1116;
    --bg-2: #111823;
    --card: #0f151d;
    --accent: #53fc18;
    --accent-strong: #3bc014;
    --text: #e7f7e9;
    --text-dim: #9ab3a0;
    --border: #1c252f;
    --shadow: 0 25px 60px rgba(0, 0, 0, 0.45);
    --radius: 14px;
    --blur: 12px;
    --top-bar-height: 72px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Poppins', 'Noto Sans JP', sans-serif;
    background:
        radial-gradient(circle at 20% 20%, rgba(83, 252, 24, 0.07), transparent 35%),
        radial-gradient(circle at 80% 10%, rgba(59, 192, 20, 0.05), transparent 40%),
        linear-gradient(160deg, #05080c 0%, #0b1016 40%, #0a0f14 100%);
    color: var(--text);
    min-height: 100vh;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    letter-spacing: 0.01em;
}

p {
    color: var(--text-dim);
    line-height: 1.6;
}

.top-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    padding: 14px 18px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(5, 8, 12, 0.9);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(var(--blur));
    z-index: 1000;
    box-shadow: var(--shadow);
    min-height: var(--top-bar-height);
}

.brand {
    display: flex;
    gap: 10px;
    align-items: center;
}

.brand i {
    color: var(--accent);
    background: rgba(83, 252, 24, 0.15);
    border: 1px solid rgba(83, 252, 24, 0.4);
    padding: 10px;
    border-radius: 12px;
}

.brand-copy {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.brand-kicker {
    font-size: 11px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--text-dim);
}

.brand-name {
    font-weight: 800;
    font-size: 18px;
    color: var(--text);
}

.top-actions {
    display: flex;
    gap: 10px;
}

.stream-menu {
    position: fixed;
    top: 0;
    right: -420px;
    width: 400px;
    height: 100%;
    background: rgba(12, 17, 22, 0.98);
    border-left: 1px solid var(--border);
    box-shadow: -12px 0 40px rgba(0, 0, 0, 0.35);
    transition: right 0.3s ease;
    z-index: 999;
    padding: 88px 20px 24px;
    overflow-y: auto;
}

.stream-menu.open {
    right: 0;
}

.menu-header {
    position: fixed;
    top: 0;
    right: 0;
    left: calc(100% - 400px);
    padding: 16px 20px;
    background: rgba(12, 17, 22, 0.98);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    z-index: 1001;
}

.menu-title {
    display: flex;
    align-items: center;
    gap: 12px;
}

.menu-title i {
    color: var(--accent);
    font-size: 20px;
}

.menu-title-text {
    font-weight: 800;
    letter-spacing: 0.04em;
}

.eyebrow {
    font-size: 11px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text-dim);
    margin-bottom: 4px;
}

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    box-shadow: var(--shadow);
    margin-bottom: 16px;
}

.section-head {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.section-head i {
    color: var(--accent);
}

.layout-buttons {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.layout-controls {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.layout-controls label {
    font-weight: 700;
    color: var(--text);
}

.layout-controls select {
    flex: 1;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
    color: var(--text);
    border-radius: 10px;
    padding: 10px 12px;
    font-size: 14px;
    color-scheme: dark;
}

.layout-controls select option {
    background: var(--bg-1);
    color: var(--text);
}

.layout-button {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
    color: var(--text);
    border-radius: 12px;
    padding: 10px;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    min-width: 120px;
    transition: all 0.2s ease;
}

.layout-button .layout-icon {
    width: 90px;
    height: 60px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: #0b0f13;
    display: grid;
    gap: 4px;
    padding: 6px;
}

.layout-icon.columns-4 {
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(3, 1fr);
}

.layout-icon.columns-3 {
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(4, 1fr);
}

.layout-icon .cell {
    background: rgba(83, 252, 24, 0.14);
    border: 1px solid rgba(83, 252, 24, 0.24);
    border-radius: 5px;
}

.layout-button.active {
    border-color: rgba(83, 252, 24, 0.6);
    box-shadow: 0 10px 30px rgba(83, 252, 24, 0.12);
}

.layout-button:hover {
    transform: translateY(-2px);
    border-color: rgba(83, 252, 24, 0.4);
}

.helper-text {
    font-size: 13px;
    margin-bottom: 10px;
}

textarea {
    width: 100%;
    min-height: 180px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
    color: var(--text);
    border-radius: 12px;
    padding: 12px;
    font-size: 14px;
    line-height: 1.6;
    resize: vertical;
}

.mute-control {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    margin: 14px 0 6px;
}

.mute-copy p {
    margin: 0;
}

.switch {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    user-select: none;
}

.switch input {
    position: absolute;
    opacity: 0;
    width: 1px;
    height: 1px;
}

.switch-slider {
    position: relative;
    width: 46px;
    height: 26px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--border);
    transition: all 0.2s ease;
    box-shadow: inset 0 1px 6px rgba(0, 0, 0, 0.25);
}

.switch-slider::after {
    content: "";
    position: absolute;
    top: 3px;
    left: 3px;
    width: 18px;
    height: 18px;
    background: var(--text);
    border-radius: 50%;
    transition: all 0.2s ease;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
}

.switch input:checked + .switch-slider {
    background: linear-gradient(120deg, var(--accent), var(--accent-strong));
    border-color: rgba(83, 252, 24, 0.6);
}

.switch input:checked + .switch-slider::after {
    transform: translateX(18px);
    background: #041104;
}

.switch-text {
    color: var(--text);
    font-weight: 700;
}

.button-row {
    display: flex;
    gap: 10px;
    margin-top: 12px;
}

.icon-button {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 10px 12px;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: var(--shadow);
}

.icon-button.ghost {
    background: rgba(255, 255, 255, 0.04);
}

.primary-button {
    background: linear-gradient(120deg, var(--accent) 0%, var(--accent-strong) 100%);
    color: #041104;
    border: none;
    padding: 12px 14px;
    border-radius: 12px;
    font-weight: 700;
    cursor: pointer;
    flex: 1;
    box-shadow: 0 16px 32px rgba(83, 252, 24, 0.2);
}

.ghost-button {
    background: rgba(255, 255, 255, 0.04);
    color: var(--text);
    border: 1px solid var(--border);
    padding: 12px 14px;
    border-radius: 12px;
    cursor: pointer;
    flex: 0 0 110px;
}

.primary-button:hover, .ghost-button:hover, .icon-button:hover {
    transform: translateY(-1px);
    border-color: rgba(83, 252, 24, 0.4);
}

.streams-wrapper {
    padding: calc(var(--top-bar-height) + 12px) 14px 14px;
    height: 100vh;
    display: flex;
    flex-direction: column;
}

.streams-container {
    display: grid;
    gap: 12px;
    flex: 1;
    min-height: 0;
    grid-auto-rows: minmax(0, 1fr);
}

.layout-3x4 {
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(3, 1fr);
}

.layout-4x3 {
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(4, 1fr);
}

.layout-4x4 {
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(4, 1fr);
}

.layout-4x5 {
    grid-template-columns: repeat(5, 1fr);
    grid-template-rows: repeat(4, 1fr);
}

.stream-player {
    background: linear-gradient(145deg, rgba(14, 21, 29, 0.85), rgba(10, 15, 20, 0.92));
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    position: relative;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow);
    transition: all 0.2s ease;
}

.stream-player:hover {
    border-color: rgba(83, 252, 24, 0.5);
    box-shadow: 0 14px 36px rgba(83, 252, 24, 0.08);
    transform: translateY(-2px);
}

.stream-header {
    display: flex;
    justify-content: flex-start;
    align-items: center;
    padding: 6px 10px;
    background: linear-gradient(90deg, rgba(83, 252, 24, 0.08), transparent);
    gap: 8px;
    cursor: move;
}

.stream-player.dragging {
    opacity: 0.35;
    border-color: rgba(83, 252, 24, 0.6);
}

.stream-player.drop-target {
    outline: 2px dashed rgba(83, 252, 24, 0.7);
    outline-offset: -4px;
}

.quick-add.hidden {
    display: none;
}

.quick-add {
    position: fixed;
    inset: 0;
    z-index: 1200;
    display: flex;
    align-items: center;
    justify-content: center;
}

.quick-add-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.55);
    backdrop-filter: blur(6px);
}

.quick-add-dialog {
    position: relative;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 18px;
    width: min(420px, 90vw);
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 1;
}

.quick-add-dialog input {
    width: 100%;
    padding: 10px 12px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.04);
    color: var(--text);
}

.quick-add .button-row {
    margin-top: 8px;
}

.slot-number {
    background: rgba(83, 252, 24, 0.16);
    border: 1px solid rgba(83, 252, 24, 0.3);
    color: var(--accent);
    padding: 4px 10px;
    border-radius: 10px;
    font-weight: 800;
    letter-spacing: 0.05em;
}

.slot-label {
    color: var(--text-dim);
    font-weight: 700;
}

.slot-delete {
    margin-left: auto;
}

.slot-delete {
    background: transparent;
    border: none;
    color: var(--text-dim);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 4px;
    cursor: pointer;
    border-radius: 8px;
    transition: color 0.2s ease, background 0.2s ease, opacity 0.2s ease;
    opacity: 0.85;
}

.slot-delete:hover {
    color: var(--accent);
    background: rgba(83, 252, 24, 0.08);
    opacity: 1;
}

.slot-delete svg {
    width: 18px;
    height: 18px;
    fill: currentColor;
}

.frame {
    flex: 1;
    background: #05080c;
    display: flex;
    align-items: center;
    justify-content: center;
}

.frame iframe {
    width: 100%;
    height: 100%;
    border: none;
    background: #000;
}

.placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-dim);
    text-align: center;
}

.placeholder i {
    font-size: 26px;
    color: var(--accent);
    padding: 10px;
    border-radius: 50%;
    background: rgba(83, 252, 24, 0.12);
    border: 1px dashed rgba(83, 252, 24, 0.3);
}

.placeholder-button {
    width: 120px;
    height: 120px;
    border-radius: 999px;
    border: 1px dashed rgba(83, 252, 24, 0.4);
    background: rgba(83, 252, 24, 0.12);
    color: var(--accent);
    font-weight: 800;
    letter-spacing: 0.08em;
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
    font-size: 18px;
}

.placeholder-button:hover {
    transform: translateY(-2px) scale(1.02);
    border-color: rgba(83, 252, 24, 0.7);
    box-shadow: 0 12px 24px rgba(83, 252, 24, 0.18);
}

/* レイアウトバリエーション */
.streams-container.layout-1x2 {
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: repeat(1, minmax(0, 1fr));
}

.streams-container.layout-1x3 {
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(1, minmax(0, 1fr));
}

.streams-container.layout-top1-bottom2 {
    grid-template-columns: repeat(2, 1fr);
}

.streams-container.layout-top1-bottom2 .stream-player:nth-child(1) {
    grid-column: 1 / span 2;
}

.streams-container.layout-1x4 {
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(1, minmax(0, 1fr));
}

.streams-container.layout-2x2 {
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: repeat(2, minmax(0, 1fr));
}

.streams-container.layout-top2-bottom3 {
    grid-template-columns: repeat(6, 1fr);
    grid-auto-flow: row dense;
}

.streams-container.layout-top2-bottom3 .stream-player:nth-child(1),
.streams-container.layout-top2-bottom3 .stream-player:nth-child(2) {
    grid-column: span 3;
}

.streams-container.layout-top2-bottom3 .stream-player:nth-child(n+3) {
    grid-column: span 2;
}

.streams-container.layout-top3-bottom2 {
    grid-template-columns: repeat(6, 1fr);
    grid-auto-flow: row dense;
}

.streams-container.layout-top3-bottom2 .stream-player:nth-child(-n+3) {
    grid-column: span 2;
}

.streams-container.layout-top3-bottom2 .stream-player:nth-child(4),
.streams-container.layout-top3-bottom2 .stream-player:nth-child(5) {
    grid-column: span 3;
}

.streams-container.layout-2x3 {
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(2, minmax(0, 1fr));
}

.streams-container.layout-3x2 {
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: repeat(3, minmax(0, 1fr));
}

.streams-container.layout-top4-bottom3 {
    grid-template-columns: repeat(4, 1fr);
}

.streams-container.layout-2x4 {
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(2, minmax(0, 1fr));
}

.streams-container.layout-4x2 {
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: repeat(4, minmax(0, 1fr));
}

.streams-container.layout-3x3 {
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(3, minmax(0, 1fr));
}

.streams-container.layout-2x5 {
    grid-template-columns: repeat(5, 1fr);
    grid-template-rows: repeat(2, minmax(0, 1fr));
}

.streams-container.layout-4x3 {
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(4, minmax(0, 1fr));
}

/* プレビューアイコン用 */
.layout-icon.layout-1x2 {
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: repeat(1, 1fr);
}

.layout-icon.layout-1x3 {
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(1, 1fr);
}

.layout-icon.layout-top1-bottom2 {
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: repeat(2, 1fr);
}

.layout-icon.layout-top1-bottom2 .cell:nth-child(1) {
    grid-column: 1 / span 2;
}

.layout-icon.layout-1x4 {
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(1, 1fr);
}

.layout-icon.layout-2x2 {
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: repeat(2, 1fr);
}

.layout-icon.layout-top2-bottom3 {
    grid-template-columns: repeat(6, 1fr);
    grid-template-rows: repeat(2, 1fr);
}

.layout-icon.layout-top2-bottom3 .cell:nth-child(1),
.layout-icon.layout-top2-bottom3 .cell:nth-child(2) {
    grid-column: span 3;
}

.layout-icon.layout-top2-bottom3 .cell:nth-child(n+3) {
    grid-column: span 2;
}

.layout-icon.layout-top3-bottom2 {
    grid-template-columns: repeat(6, 1fr);
    grid-template-rows: repeat(2, 1fr);
}

.layout-icon.layout-top3-bottom2 .cell:nth-child(-n+3) {
    grid-column: span 2;
}

.layout-icon.layout-top3-bottom2 .cell:nth-child(4),
.layout-icon.layout-top3-bottom2 .cell:nth-child(5) {
    grid-column: span 3;
}

.layout-icon.layout-2x3 {
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(2, 1fr);
}

.layout-icon.layout-3x2 {
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: repeat(3, 1fr);
}

.layout-icon.layout-top4-bottom3 {
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(2, 1fr);
}

.layout-icon.layout-2x4 {
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(2, 1fr);
}

.layout-icon.layout-4x2 {
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: repeat(4, 1fr);
}

.layout-icon.layout-3x3 {
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(3, 1fr);
}

.layout-icon.layout-2x5 {
    grid-template-columns: repeat(5, 1fr);
    grid-template-rows: repeat(2, 1fr);
}

.layout-icon.layout-4x3 {
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(4, 1fr);
}

.layout-icon.layout-4x4 {
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(4, 1fr);
}

.layout-icon.layout-4x5 {
    grid-template-columns: repeat(5, 1fr);
    grid-template-rows: repeat(4, 1fr);
}

@media (max-width: 1200px) {
    .streams-wrapper {
        height: auto;
        min-height: calc(100vh - 20px);
    }

    .streams-container {
        height: auto;
        min-height: 0;
    }
}

@media (max-width: 900px) {
    .streams-container {
        grid-template-columns: repeat(2, 1fr);
        grid-template-rows: none;
        height: auto;
        min-height: 0;
    }
    
    .stream-menu {
        width: 100%;
        right: -100%;
    }

    .menu-header {
        left: 0;
    }
}