/* 
 * VoiceBraille-Survey Base Styles
 * Clean, accessible, modern design system
 */

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #eff6ff;
    --accent-yellow: #facc15;
    --dark-bg: #0f172a;
    --dark-card: #1e293b;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --bg-page: #f8fafc;
    --border-color: #e2e8f0;
    --success-color: #16a34a;
    --danger-color: #dc2626;
    --focus-ring: #f59e0b;
    --radius-lg: 16px;
    --radius-md: 10px;
    --radius-sm: 6px;
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --font-family: 'Sarabun', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-page);
    color: var(--text-main);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Accessibility Focus Ring */
*:focus-visible {
    outline: 4px solid var(--focus-ring) !important;
    outline-offset: 3px !important;
}

/* Container */
.container {
    max-width: 1050px;
    margin: 0 auto;
    padding: 24px 20px;
    width: 100%;
}

/* Header */
header.app-header {
    background: #ffffff;
    border-bottom: 2px solid var(--border-color);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 50;
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text-main);
}

.logo-icon {
    background: var(--primary-color);
    color: #ffffff;
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    font-weight: bold;
}

.logo-text h1 {
    font-size: 1.25rem;
    font-weight: 700;
    line-height: 1.2;
}

.logo-text p {
    font-size: 0.82rem;
    color: var(--text-muted);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 18px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s ease;
}

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

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

.btn-secondary {
    background-color: #f1f5f9;
    color: var(--text-main);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: #e2e8f0;
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

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

.btn-large {
    padding: 16px 28px;
    font-size: 1.25rem;
    border-radius: var(--radius-lg);
}

/* Footer */
footer.app-footer {
    margin-top: auto;
    background: #ffffff;
    border-top: 1px solid var(--border-color);
    padding: 20px 0;
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* Screen reader only utility */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.hidden {
    display: none !important;
}