:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f0f2f5;
    --sidebar-bg: rgba(255, 255, 255, 0.7);
    --text-primary: #1c1e21;
    --text-secondary: #65676b;
    --accent-color: #0084ff;
    --accent-hover: #0073e6;
    --border-color: rgba(0, 0, 0, 0.1);
    --glass-border: rgba(255, 255, 255, 0.3);
    --sidebar-width: 340px;
    --header-height: 70px;
    --transition-speed: 0.4s;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.1);
    --radius-lg: 16px;
    --radius-md: 12px;
}

[data-theme="dark"] {
    --bg-primary: #0f0f0f;
    --bg-secondary: #1a1a1a;
    --sidebar-bg: rgba(26, 26, 26, 0.75);
    --text-primary: #e4e6eb;
    --text-secondary: #b0b3b8;
    --accent-color: #4599ff;
    --accent-hover: #66aaff;
    --border-color: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.05);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

html,
body {
    height: 100%;
}

body {
    font-family: "Wanted Sans Variable", "Wanted Sans", -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    overflow: hidden;
    transition: background-color var(--transition-speed);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 5px;
    border: 2px solid var(--bg-secondary);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

#app {
    display: flex;
    flex-direction: column;
    height: 100%;
}

header {
    height: var(--header-height);
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2.5rem;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.logo {
    font-size: 1.6rem;
    font-weight: 800;
    letter-spacing: -1.5px;
    background: linear-gradient(135deg, var(--accent-color), #8e2de2);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.icon-btn {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    width: 42px;
    height: 42px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    color: var(--text-primary);
}

.icon-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--accent-color);
}

[data-theme="dark"] .icon-sun,
[data-theme="light"] .icon-moon {
    display: none;
}

main {
    display: flex;
    flex: 1;
    overflow: hidden;
    position: relative;
}

#sidebar {
    width: var(--sidebar-width);
    background-color: var(--sidebar-bg);
    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);
    border-right: 1px solid var(--glass-border);
    padding: 1.5rem;
    overflow-y: auto;
    z-index: 50;
    transition: left 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.control-group {
    margin-bottom: 1.5rem;
    background: var(--sidebar-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

.control-group h3 {
    font-size: 0.75rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    color: var(--accent-color);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.control-item {
    margin-bottom: 1.2rem;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

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

.label-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.control-item label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
}

.value-badge {
    font-size: 0.75rem;
    font-weight: 700;
    background: var(--accent-color);
    color: white !important;
    padding: 2px 8px;
    border-radius: 10px;
    min-width: 30px;
    text-align: center;
}

.control-item select {
    padding: 0.7rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.9rem;
    cursor: pointer;
}

.control-item select:focus {
    outline: none;
    border-color: var(--accent-color);
}

input[type="color"] {
    width: 100%;
    height: 40px;
    padding: 2px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    cursor: pointer;
}

input[type="color"]:focus {
    outline: none;
    border-color: var(--accent-color);
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    background: var(--accent-color);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 10px rgba(0, 132, 255, 0.3);
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.control-item.checkbox {
    flex-direction: row;
    align-items: center;
    gap: 0.8rem;
    cursor: pointer;
}

.control-item.checkbox input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--accent-color);
}

.control-item.checkbox label {
    cursor: pointer;
    margin-bottom: 0;
}

.button-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.8rem;
}

.primary-btn,
.secondary-btn {
    padding: 0.9rem;
    border-radius: var(--radius-md);
    font-weight: 700;
    font-family: inherit;
    font-size: 0.9rem;
    cursor: pointer;
    border: none;
}

.primary-btn {
    background: linear-gradient(135deg, var(--accent-color), #00c6ff);
    color: white;
    width: 100%;
    box-shadow: 0 4px 15px rgba(0, 132, 255, 0.3);
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 132, 255, 0.4);
}

.secondary-btn {
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.secondary-btn:hover {
    border-color: var(--accent-color);
    background: var(--bg-secondary);
}

.secondary-btn.active {
    background: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

.hint {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 0.8rem;
    line-height: 1.4;
}

#canvas-container {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    /* 사이드바 가림 방지 */
    padding: 5rem;
    overflow: auto;
    position: relative;
    background-image: radial-gradient(var(--border-color) 1px, transparent 1px);
    background-size: 30px 30px;
    scroll-behavior: auto;
    /* Changed from smooth to auto for instant response */
}

.canvas-controls {
    position: fixed;
    bottom: 2rem;
    left: calc(var(--sidebar-width) + 2rem);
    z-index: 60;
}

.zoom-wrapper {
    background-color: var(--sidebar-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 0.8rem 1.2rem;
    border-radius: 50px;
    border: 1px solid var(--glass-border);
    display: flex;
    align-items: center;
    gap: 1rem;
    box-shadow: var(--shadow-md);
    min-width: 220px;
}

#zoom-val {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-primary);
    min-width: 45px;
}

.canvas-wrapper {
    box-shadow: var(--shadow-md);
    border-radius: 4px;
    background-color: white;
    flex-shrink: 0;
}

.upload-area {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 100;
}

#canvas-preview-outer {
    position: fixed;
    bottom: 6.5rem;
    left: 50%;
    transform: translateX(-50%);
    width: 60%;
    max-width: 600px;
    z-index: 95;
    display: none;
    /* Hidden by default */
}

#canvas-preview-container {
    position: relative;
    width: 100%;
    height: 40px;
    /* Restored height for preview visibility */
    background: var(--sidebar-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    cursor: pointer;
}

#preview-canvas {
    width: 100%;
    height: 100%;
    display: block;
    /* Show preview again */
    opacity: 0.5;
}

#preview-viewport {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    background: rgba(69, 153, 255, 0.3);
    border: 2px solid var(--accent-color);
    border-radius: 4px;
    box-shadow: 0 0 15px rgba(0, 132, 255, 0.5);
    min-width: 40px;
    pointer-events: none;
    transition: none !important;
    /* Ensure no transitions */
}

#canvas-preview-container:hover #preview-viewport {
    opacity: 1;
    height: 28px;
}

.upload-btn {
    padding: 1.2rem 3rem;
    background: linear-gradient(135deg, #1c1e21, #444);
    color: white;
    border-radius: 50px;
    font-weight: 700;
    cursor: pointer;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    display: flex;
    align-items: center;
    gap: 0.8rem;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    white-space: nowrap;
}

[data-theme="dark"] .upload-btn {
    background: linear-gradient(135deg, var(--accent-color), #8e2de2);
}

.upload-btn:hover {
    transform: scale(1.05) translateY(-5px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
}

.upload-icon {
    font-size: 1.4rem;
    line-height: 1;
}

/* Toast Notification */
#toast-container {
    position: fixed;
    top: 2rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    pointer-events: none;
}

.toast {
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 1rem 2rem;
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.9rem;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: var(--shadow-md);
    animation: toast-in 0.3s ease-out forwards, toast-out 0.3s ease-in forwards 2.7s;
}

@keyframes toast-in {
    from {
        transform: translateY(-20px);
        opacity: 0;
    }

    to {
        transform: translateY(0);
        opacity: 1;
    }
}

@keyframes toast-out {
    from {
        transform: translateY(0);
        opacity: 1;
    }

    to {
        transform: translateY(-20px);
        opacity: 0;
    }
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .mobile-only {
        display: flex;
    }

    #sidebar {
        position: fixed;
        left: -100%;
        top: var(--header-height);
        bottom: 0;
        width: 100%;
        max-width: 340px;
    }

    #sidebar.open {
        left: 0;
    }

    #canvas-container {
        padding: 1.5rem;
    }

    header {
        padding: 0 1.5rem;
    }

    .canvas-controls {
        left: 1rem;
        bottom: 7rem;
    }

    .upload-area {
        bottom: 1.5rem;
    }
}

/* Tutorial Overlay */
.tutorial-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(10px);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.tutorial-overlay.show {
    opacity: 1;
    visibility: visible;
}

.tutorial-content {
    max-width: 500px;
    width: 100%;
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.tutorial-content h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
    background: linear-gradient(135deg, #fff, #888);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.tutorial-steps {
    text-align: left;
    margin-bottom: 2.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.step {
    display: flex;
    gap: 1.2rem;
    align-items: flex-start;
}

.step-icon {
    font-size: 1.5rem;
    background: rgba(255, 255, 255, 0.05);
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    flex-shrink: 0;
}

.step-text strong {
    display: block;
    font-size: 1.1rem;
    margin-bottom: 0.3rem;
    color: var(--accent-color);
}

.step-text p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

#close-tutorial {
    width: 100%;
    padding: 1.2rem;
    font-size: 1.1rem;
    letter-spacing: 1px;
}

@media (min-width: 1025px) {
    .mobile-only {
        display: none !important;
    }
}

@media (max-width: 1024px) {
    .pc-only {
        display: none !important;
    }
}

/* Upload Overlay */
.upload-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.upload-overlay.show {
    opacity: 1;
    visibility: visible;
}

.upload-status {
    padding: 2rem 3rem;
    border-radius: var(--radius-lg);
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(255, 255, 255, 0.1);
    border-left-color: var(--accent-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.upload-status p {
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--text-primary);
}

#upload-progress {
    font-size: 0.9rem;
    color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.05);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
}