/* ==========================================================================
   App4OT - Global Layout & Navigation System
   ========================================================================== */

/* Base Reset & Box Sizing */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: 'Plus Jakarta Sans', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--color-bg-canvas);
    color: var(--color-text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    width: 100%;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

/* ==========================================================================
   Container & Grid Layouts
   ========================================================================== */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin-left: auto;
    margin-right: auto;
    padding-left: 32px;
    padding-right: 32px;
}

@media (max-width: 768px) {
    .container {
        padding-left: 20px;
        padding-right: 20px;
    }
}

/* ==========================================================================
   Clinical Top Bar (Trust & Medical Reliability)
   ========================================================================== */
.topbar {
    background-color: var(--color-brand-primary-dark);
    color: #94a3b8;
    font-size: 0.8rem;
    padding: 8px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.topbar-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
}

.topbar-badges {
    display: flex;
    align-items: center;
    gap: 18px;
    flex-wrap: wrap;
}

.topbar-badge-item {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: #cbd5e1;
    font-weight: 500;
}

.topbar-badge-item i {
    color: #38bdf8;
    font-size: 0.95rem;
}

.topbar-contact {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: #94a3b8;
    font-weight: 500;
}

.topbar-contact a {
    color: #e2e8f0;
}

.topbar-contact a:hover {
    color: #38bdf8;
}

@media (max-width: 900px) {
    .topbar {
        display: none;
    }
}

/* ==========================================================================
   Primary Navigation Bar
   ========================================================================== */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border-subtle);
    padding: 14px 0;
    transition: all var(--transition-base);
}

.navbar.scrolled {
    box-shadow: 0 8px 24px rgba(15, 23, 42, 0.06);
    padding: 10px 0;
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.logo {
    display: flex;
    align-items: center;
    font-size: 1.45rem;
    font-weight: 800;
    color: var(--color-brand-primary);
    letter-spacing: -0.5px;
    white-space: nowrap;
}

.logo img {
    height: 38px;
    width: 38px;
    margin-right: 12px;
    border-radius: 50%;
    box-shadow: 0 2px 8px rgba(15, 61, 56, 0.2);
}

.logo span {
    color: var(--color-brand-accent);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 20px;
    list-style: none;
}

.nav-links a {
    font-size: 0.92rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    padding: 6px 10px;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.nav-links a:hover {
    color: var(--color-brand-primary);
    background-color: var(--color-bg-subtle);
}

/* Language Selector Pill */
.lang-selector-wrapper {
    position: relative;
    display: inline-flex;
    align-items: center;
}

.lang-select-pill {
    appearance: none;
    -webkit-appearance: none;
    background: #ffffff url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath fill='%230f3d38' d='M0 0l5 6 5-6z'/%3E%3C/svg%3E") no-repeat right 12px center;
    border: 1.5px solid var(--color-border-medium);
    border-radius: var(--radius-full);
    padding: 7px 32px 7px 14px;
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--color-brand-primary);
    cursor: pointer;
    outline: none;
    transition: border-color var(--transition-fast);
}

.lang-select-pill:hover, .lang-select-pill:focus {
    border-color: var(--color-brand-primary);
}

/* Nav Action Buttons */
.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.btn-nav-primary {
    background: linear-gradient(135deg, var(--color-brand-primary) 0%, var(--color-brand-primary-light) 100%);
    color: #ffffff !important;
    padding: 9px 20px !important;
    font-size: 0.88rem !important;
    font-weight: 700 !important;
    border-radius: var(--radius-full) !important;
    box-shadow: 0 4px 12px rgba(15, 61, 56, 0.25);
    white-space: nowrap;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.btn-nav-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 18px rgba(15, 61, 56, 0.35);
    background-color: var(--color-brand-primary-dark) !important;
}

/* Mobile Toggle */
.mobile-toggle {
    display: none;
    font-size: 1.8rem;
    color: var(--color-brand-primary);
    cursor: pointer;
    background: none;
    border: none;
    padding: 4px;
}

@media (max-width: 1024px) {
    .mobile-toggle {
        display: block;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 20px 24px 28px;
        border-bottom: 2px solid var(--color-border-subtle);
        box-shadow: var(--shadow-xl);
        gap: 8px;
    }

    .nav-links.active {
        display: flex;
    }

    .nav-links li, .nav-links a {
        width: 100%;
        display: block;
        padding: 12px 14px;
        font-size: 1rem;
    }

    .nav-links a {
        border-bottom: 1px solid var(--color-bg-subtle);
    }
}