/* 
 * Minimal & Modern Theme (Inspired by BASE/Minimalist E-commerce)
 */

 :root {
    /* Light Theme (Default) */
    --bg-body: #f9fafb;
    --bg-card: #ffffff;
    --text-main: #111827;
    --text-muted: #6b7280;
    --border-color: #e5e7eb;
    --border-hover: #d1d5db;
    --input-bg: #f9fafb;
    --accent: #E01E5A; /* Slack Red (メインボタン等) */
    --accent-hover: #C51146;
    --accent-text: #ffffff;
    --focus-ring: rgba(224, 30, 90, 0.2);
    --slack-blue: #36C5F0;
    --slack-green: #2EB67D;
    --slack-yellow: #ECB22E;
    
    font-family: 'Inter', 'Noto Sans JP', sans-serif;
}

.dark-mode {
    /* Dark Theme */
    --bg-body: #111827;
    --bg-card: #1f2937;
    --text-main: #f9fafb;
    --text-muted: #9ca3af;
    --border-color: #374151;
    --border-hover: #4b5563;
    --input-bg: #111827;
    --accent: #E01E5A; /* Slack Red */
    --accent-hover: #F22F6A;
    --accent-text: #ffffff;
    --focus-ring: rgba(224, 30, 90, 0.2);
    --slack-blue: #36C5F0;
    --slack-green: #2EB67D;
    --slack-yellow: #ECB22E;
}

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

body {
    background-color: var(--bg-body);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 3rem 1.5rem;
    transition: background-color 0.3s ease, color 0.3s ease;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* ランダムに動くオーブアニメーション */
.bg-orbs {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
    opacity: 0.5; /* ダークモード/ライトモードで主張しすぎない透明度 */
}

.orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    animation: float 20s infinite alternate ease-in-out;
}

.orb:nth-child(1) {
    width: 40vw;
    height: 40vw;
    background: var(--slack-blue);
    top: -10vw;
    left: -10vw;
    animation-delay: 0s;
}

.orb:nth-child(2) {
    width: 35vw;
    height: 35vw;
    background: var(--accent); /* Slack Red */
    bottom: -5vw;
    right: -10vw;
    animation-delay: -5s;
    animation-duration: 25s;
}

.orb:nth-child(3) {
    width: 30vw;
    height: 30vw;
    background: var(--slack-yellow);
    top: 30vh;
    left: 40vw;
    animation-delay: -10s;
    animation-duration: 30s;
}

.orb:nth-child(4) {
    width: 25vw;
    height: 25vw;
    background: var(--slack-green);
    bottom: 10vh;
    left: 10vw;
    animation-delay: -15s;
    animation-duration: 22s;
}

@keyframes float {
    0% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(5vw, 5vh) scale(1.1); }
    66% { transform: translate(-5vw, 10vh) scale(0.9); }
    100% { transform: translate(8vw, -5vh) scale(1.05); }
}

.app-container {
    width: 100%;
    max-width: 860px;
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
}

/* Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.header-content h1 {
    font-size: 2rem;
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 0.5rem;
    /* Slackの4色を使ったグラデーションテキスト */
    background: linear-gradient(135deg, var(--slack-blue) 0%, var(--slack-green) 33%, var(--slack-yellow) 66%, var(--accent) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.header-content p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.theme-toggle-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-main);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: all 0.2s;
}

.theme-toggle-btn:hover {
    background: var(--input-bg);
}

.light-mode .icon-sun { display: none; }
.light-mode .icon-moon { display: block; }

.dark-mode .icon-sun { display: block; }
.dark-mode .icon-moon { display: none; }

/* Main Layout */
.main-content {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 2rem;
    align-items: start;
}

@media (max-width: 768px) {
    .main-content {
        grid-template-columns: 1fr;
    }
}

/* Base Components */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    background-color: color-mix(in srgb, var(--bg-card) 85%, transparent);
}

/* Preview Section */
.preview-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 3rem 2rem;
    position: sticky;
    top: 2rem;
}

.canvas-wrapper {
    position: relative;
    width: 128px;
    height: 128px;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    border: 1px solid var(--border-color);
}

.checkerboard {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background-image: 
        linear-gradient(45deg, #e5e7eb 25%, transparent 25%), 
        linear-gradient(-45deg, #e5e7eb 25%, transparent 25%), 
        linear-gradient(45deg, transparent 75%, #e5e7eb 75%), 
        linear-gradient(-45deg, transparent 75%, #e5e7eb 75%);
    background-size: 16px 16px;
    background-position: 0 0, 0 8px, 8px -8px, -8px 0px;
    background-color: #f9fafb;
    z-index: 0;
}

.dark-mode .checkerboard {
    background-image: 
        linear-gradient(45deg, #374151 25%, transparent 25%), 
        linear-gradient(-45deg, #374151 25%, transparent 25%), 
        linear-gradient(45deg, transparent 75%, #374151 75%), 
        linear-gradient(-45deg, transparent 75%, #374151 75%);
    background-color: #1f2937;
}

canvas {
    position: relative;
    z-index: 1;
    width: 100%;
    height: 100%;
}

.preview-info {
    margin-top: 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.preview-badge {
    font-size: 0.75rem;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    padding: 0.2rem 0.6rem;
    border-radius: 12px;
    font-weight: 500;
}

.preview-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Controls Section */
.control-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.control-block {
    padding: 1.5rem;
}

.section-title {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 1.25rem;
}

.control-row {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

.control-row:last-child {
    margin-bottom: 0;
}

.control-row.align-center {
    align-items: center;
}

.flex-1 { flex: 1; }
.flex-2 { flex: 2; }

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.sub-label {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-muted);
}

/* Inputs & Selects */
textarea, select {
    width: 100%;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 0.6rem 0.8rem;
    border-radius: 6px;
    font-family: inherit;
    font-size: 0.95rem;
    outline: none;
    transition: all 0.2s;
    appearance: none;
}

textarea {
    resize: vertical;
    min-height: 80px;
}

textarea:focus, select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--focus-ring);
}

.select-wrapper {
    position: relative;
}

.select-wrapper::after {
    content: '';
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    width: 0; 
    height: 0; 
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-top: 5px solid var(--text-muted);
    pointer-events: none;
}

/* Toggle Switch */
.toggle-switch {
    display: inline-flex;
    align-items: center;
    cursor: pointer;
    gap: 0.75rem;
    font-size: 0.875rem;
    color: var(--text-main);
}

.toggle-switch input {
    display: none;
}

.slider {
    position: relative;
    width: 40px;
    height: 22px;
    background-color: var(--border-color);
    border-radius: 22px;
    transition: .3s;
}

.slider::before {
    position: absolute;
    content: "";
    height: 16px;
    width: 16px;
    left: 3px;
    bottom: 3px;
    background-color: var(--bg-card);
    border-radius: 50%;
    transition: .3s;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.toggle-switch input:checked + .slider {
    background-color: var(--slack-green); /* Slack Green for toggles */
}

.toggle-switch input:checked + .slider::before {
    transform: translateX(18px);
    background-color: var(--accent-text);
}

/* Align Buttons */
.align-buttons {
    display: flex;
    background: var(--input-bg);
    border-radius: 6px;
    border: 1px solid var(--border-color);
    overflow: hidden;
    height: 38px;
}

.align-btn {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    justify-content: center;
    align-items: center;
}

.align-btn:not(:last-child) {
    border-right: 1px solid var(--border-color);
}

.align-btn:hover {
    background: var(--bg-card);
    color: var(--slack-yellow); /* Hover effect to utilize yellow */
}

.align-btn.active {
    background: var(--slack-blue); /* Slack Blue for active states like alignment */
    color: #ffffff;
}

/* Color Picker */
.color-picker-wrapper {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 0.4rem 0.6rem;
    height: 38px;
    cursor: pointer;
    transition: all 0.2s;
}

.color-picker-wrapper:hover {
    border-color: var(--border-hover);
}

.color-preview {
    width: 20px;
    height: 20px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    flex-shrink: 0;
}

.color-hex {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-family: inherit;
    text-transform: uppercase;
}

input[type="color"] {
    opacity: 0;
    width: 0;
    height: 0;
    position: absolute;
    pointer-events: none;
}

/* Primary Button */
.primary-btn {
    width: 100%;
    background: var(--accent);
    color: var(--accent-text);
    border: none;
    padding: 1rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: all 0.2s ease;
    margin-top: 1rem;
    border-bottom: 3px solid rgba(0, 0, 0, 0.2); /* Solid interactive feel */
}

.primary-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(224, 30, 90, 0.3);
}

.primary-btn:active {
    transform: translateY(1px);
    border-bottom-width: 1px;
    margin-bottom: 2px;
}

.primary-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}