/* ========================================
   Font Faces - Local Embedded Fonts
   ======================================== */

/* Primary font for version label (bold, blue) */
@font-face {
    font-family: 'CenikFont';
    src: url('../assets/fonts/OpenSans-Bold.woff2') format('woff2'),
         url('../assets/fonts/OpenSans-Bold.woff') format('woff');
    font-weight: 700;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'CenikFont';
    src: url('../assets/fonts/OpenSans-Regular.woff2') format('woff2'),
         url('../assets/fonts/OpenSans-Regular.woff') format('woff');
    font-weight: 400;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'CenikFont';
    src: url('../assets/fonts/OpenSans-Light.woff2') format('woff2'),
         url('../assets/fonts/OpenSans-Light.woff') format('woff');
    font-weight: 300;
    font-style: normal;
    font-display: swap;
}

/* ========================================
   CSS Variables
   ======================================== */

:root {
    --color-primary: #1a5a96;
    --color-primary-dark: #134a7a;
    --color-success: #28a745;
    --color-error: #dc3545;
    --color-warning: #ffc107;
    --color-text: #333;
    --color-text-light: #666;
    --color-border: #ddd;
    --color-bg: #f8f9fa;
    --color-white: #fff;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --radius: 8px;
    --transition: 0.2s ease;
}

/* ========================================
   Base Styles
   ======================================== */

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

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    font-size: 16px;
    line-height: 1.5;
    color: var(--color-text);
    background: var(--color-bg);
    min-height: 100vh;
}

/* ========================================
   Layout
   ======================================== */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.header {
    text-align: center;
    margin-bottom: 2rem;
}

.header h1 {
    margin: 0;
    font-size: 2rem;
    color: var(--color-primary);
    font-weight: 600;
}

.subtitle {
    margin: 0.5rem 0 0;
    color: var(--color-text-light);
}

.main {
    flex: 1;
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 2rem;
    align-items: start;
}

@media (max-width: 900px) {
    .main {
        grid-template-columns: 1fr;
    }
}

.footer {
    text-align: center;
    padding: 1.5rem 0;
    color: var(--color-text-light);
    font-size: 0.875rem;
    margin-top: 2rem;
}

/* ========================================
   Controls Panel
   ======================================== */

.controls {
    background: var(--color-white);
    padding: 1.5rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group:last-child {
    margin-bottom: 0;
}

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--color-text);
}

.input {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    transition: border-color var(--transition), box-shadow var(--transition);
    font-family: inherit;
}

.input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(26, 90, 150, 0.1);
}

.input::placeholder {
    color: #aaa;
}

select.input {
    cursor: pointer;
    background: var(--color-white);
}

.hint {
    display: block;
    font-size: 0.75rem;
    color: var(--color-text-light);
    margin-top: 0.25rem;
}

/* ========================================
   Buttons
   ======================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--transition);
    font-family: inherit;
    width: 100%;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-white);
}

.btn-primary:hover:not(:disabled) {
    background: var(--color-primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

/* ========================================
   Messages
   ======================================== */

.error-message,
.warning-message {
    padding: 0.75rem 1rem;
    border-radius: var(--radius);
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

.error-message {
    background: #fce4e4;
    color: var(--color-error);
    border: 1px solid #f5c6c6;
}

.warning-message {
    background: #fff8e1;
    color: #856404;
    border: 1px solid #ffeeba;
}

/* ========================================
   Preview Section
   ======================================== */

.preview-section {
    background: var(--color-white);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.preview-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--color-border);
}

.preview-header h2 {
    margin: 0;
    font-size: 1rem;
    font-weight: 500;
}

.resolution-info {
    font-size: 0.75rem;
    color: var(--color-text-light);
    font-family: monospace;
}

.preview-container {
    padding: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 400px;
    background: #f0f0f0;
}

.preview-placeholder {
    text-align: center;
    color: var(--color-text-light);
}

.preview-placeholder svg {
    opacity: 0.4;
    margin-bottom: 1rem;
}

.preview-placeholder p {
    margin: 0;
}

#preview-canvas {
    max-width: 100%;
    height: auto;
    box-shadow: var(--shadow-md);
    background: var(--color-white);
}

/* ========================================
   Loading State
   ======================================== */

.loading {
    position: relative;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--color-white);
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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