@font-face {
    font-family: 'Swis721 Cn BT';
    src: url('fonts/Swis721 Cn BT Bold.ttf') format('truetype');
    font-weight: bold;
    font-style: normal;
}

@font-face {
    font-family: 'Swis721 BT';
    src: url('fonts/Swis721 BT Roman.ttf') format('truetype');
    font-weight: normal;
    font-style: normal;
}

@font-face {
    font-family: 'Swis721 BT';
    src: url('fonts/Swis721 BT Bold.ttf') format('truetype');
    font-weight: bold;
    font-style: normal;
}

:root {
    --bg-color: #0f172a;
    --panel-bg: rgba(30, 41, 59, 0.7);
    --panel-border: rgba(255, 255, 255, 0.1);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --input-bg: rgba(15, 23, 42, 0.6);
    --input-border: rgba(255, 255, 255, 0.15);
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.app-container {
    display: flex;
    flex-direction: column;
    width: 100%;
    max-width: 430px; /* iPhone Pro Max optimized width */
    margin: 0 auto;
    min-height: 100vh;
    padding: 1rem;
    gap: 1rem;
}

.glass-panel {
    background: var(--panel-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--panel-border);
    border-radius: 16px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.sidebar {
    width: 100%;
    display: flex;
    flex-direction: column;
    padding: 1.25rem;
    gap: 1.25rem;
}

header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
    background: linear-gradient(135deg, #60a5fa, #a78bfa);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

header p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.switch-group {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
}

label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
}

.font-hint {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: normal;
}

.premium-input {
    width: 100%;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 8px;
    padding: 0.75rem 1rem;
    color: var(--text-primary);
    font-size: 0.95rem;
    font-family: inherit;
    transition: all 0.2s;
    outline: none;
    resize: vertical;
}

.premium-input:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.sub-control {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 0.5rem;
    margin-top: 0.25rem;
}

/* Toggle Switch */
.toggle-switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
}
.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}
.slider {
    position: absolute;
    cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: var(--input-border);
    transition: .4s;
    border-radius: 24px;
}
.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: #fff;
    transition: .4s;
    border-radius: 50%;
}
input:checked + .slider {
    background-color: var(--accent-color);
}
input:checked + .slider:before {
    transform: translateX(20px);
}

.actions {
    margin-top: 1rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.btn-primary {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.875rem;
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
}

.btn-primary:hover {
    background: var(--accent-hover);
}

.btn-primary:active {
    transform: scale(0.98);
}

.status-message {
    font-size: 0.875rem;
    text-align: center;
    min-height: 1.25rem;
    color: #10b981; /* Default success green */
}

/* Preview Area */
.preview-area {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
}

.canvas-wrapper {
    position: relative;
    max-width: 100%;
    max-height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 1rem;
    overflow: hidden;
}

canvas {
    max-width: 100%;
    max-height: 80vh;
    object-fit: contain;
    border-radius: 8px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    transition: opacity 0.3s;
}

.overlay {
    position: absolute;
    inset: 0;
    background: var(--panel-bg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    border-radius: inherit;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
}

.overlay.active {
    opacity: 1;
    pointer-events: all;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--input-border);
    border-top-color: var(--accent-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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