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

:root {
    --primary: #EC4899;
    --secondary: #8B5CF6;
    --accent: #F59E0B;
    --bg: #0F172A;
    --surface: #1E1B4B;
    --surface2: #1a1040;
    --border: #312E81;
    --text: #F0FEFF;
    --text-dim: #A5B4FC;
    --font: 'Inter', system-ui, sans-serif;
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    height: 100vh;
    overflow: hidden;
    display: flex;
    flex-direction: column
}

/* Header */
header {
    padding: .45rem .85rem;
    border-bottom: 1px solid var(--border);
    background: rgba(30, 27, 75, .95);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: .5rem;
    flex-wrap: wrap;
    flex-shrink: 0
}

.logo {
    display: flex;
    align-items: center;
    gap: .45rem
}

.logo-icon {
    width: 28px;
    height: 28px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: .8rem
}

.logo h1 {
    font-size: .82rem;
    font-weight: 700;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent
}

.logo-sub {
    font-size: .58rem;
    color: var(--text-dim)
}

.header-center {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: .2rem
}

.platform-tabs {
    display: flex;
    gap: .2rem;
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: 7px;
    padding: .15rem
}

.plat-btn {
    border: none;
    background: none;
    color: var(--text-dim);
    font-family: var(--font);
    font-size: .65rem;
    font-weight: 600;
    padding: .2rem .45rem;
    border-radius: 5px;
    cursor: pointer;
    transition: all .14s;
    white-space: nowrap
}

.plat-btn.active,
.plat-btn:hover {
    background: var(--primary);
    color: #fff
}

.size-badge {
    font-size: .62rem;
    color: var(--text-dim);
    font-family: monospace;
    background: rgba(255, 255, 255, .05);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: .08rem .35rem
}

.header-actions {
    display: flex;
    gap: .3rem
}

.btn {
    padding: .26rem .55rem;
    border-radius: 6px;
    border: none;
    font-family: var(--font);
    font-size: .68rem;
    font-weight: 600;
    cursor: pointer;
    transition: all .14s
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #fff
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 15px rgba(236, 72, 153, .4)
}

.btn-secondary {
    background: rgba(255, 255, 255, .06);
    color: var(--text);
    border: 1px solid var(--border)
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, .1)
}

/* App layout */
.app-body {
    flex: 1;
    display: grid;
    grid-template-columns: 270px 1fr;
    overflow: hidden
}

/* Sidebar */
.sidebar {
    overflow-y: auto;
    border-right: 1px solid var(--border);
    background: var(--surface);
    padding: 0
}

.panel-section {
    padding: .5rem .65rem;
    border-bottom: 1px solid var(--border)
}

.panel-title {
    font-size: .68rem;
    font-weight: 700;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: .06em;
    margin-bottom: .4rem
}

.form-group {
    margin-bottom: .4rem
}

.form-label {
    font-size: .62rem;
    font-weight: 600;
    color: var(--text-dim);
    display: block;
    margin-bottom: .1rem;
    text-transform: uppercase;
    letter-spacing: .04em
}

.form-input {
    width: 100%;
    background: rgba(255, 255, 255, .05);
    border: 1px solid var(--border);
    border-radius: 5px;
    color: var(--text);
    font-family: var(--font);
    font-size: .76rem;
    padding: .24rem .4rem;
    outline: none;
    transition: border-color .15s
}

.form-input:focus {
    border-color: var(--primary)
}

.form-textarea {
    resize: vertical;
    min-height: 44px;
    line-height: 1.5
}

.row-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: .3rem
}

.color-input {
    width: 100%;
    height: 32px;
    border-radius: 5px;
    border: 1px solid var(--border);
    cursor: pointer;
    background: none;
    padding: .1rem
}

/* Template grid */
.tpl-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: .3rem;
    margin-bottom: .15rem
}

.tpl-card {
    border: 2px solid var(--border);
    border-radius: 6px;
    cursor: pointer;
    transition: all .14s;
    overflow: hidden;
    aspect-ratio: 16/10;
    position: relative
}

.tpl-card:hover {
    border-color: rgba(236, 72, 153, .4);
    transform: translateY(-1px)
}

.tpl-card.active-tpl {
    border-color: var(--primary)
}

.tpl-name {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, .7);
    font-size: .57rem;
    font-weight: 700;
    padding: .1rem .3rem;
    text-align: center;
    color: #fff
}

/* Canvas area */
.canvas-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: #050510;
    overflow: auto;
    padding: 1rem;
    gap: .5rem
}

.canvas-wrapper {
    position: relative
}

#main-canvas {
    display: block;
    max-width: 100%;
    max-height: calc(100vh - 140px);
    border-radius: 8px;
    box-shadow: 0 24px 60px rgba(0, 0, 0, .8)
}

.canvas-tip {
    font-size: .62rem;
    color: #444;
    text-align: center
}

::-webkit-scrollbar {
    width: 4px
}

::-webkit-scrollbar-track {
    background: var(--surface)
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 2px
}

@media(max-width:700px) {
    .app-body {
        grid-template-columns: 1fr;
        height: auto
    }
}