/* 
 * Tabib Health Tech - Modern Design System (2025 Refactor)
 * High-performance, accessible, and responsive CSS.
 */

:root {
    /* --- Modern Color Palette --- */
    /* Primary: Trustworthy Green */
    --color-primary-50: #ecfdf5;
    --color-primary-100: #d1fae5;
    --color-primary-200: #a7f3d0;
    --color-primary-300: #6ee7b7;
    --color-primary-400: #34d399;
    --color-primary-500: #10b981;
    /* Main Brand Color */
    --color-primary-600: #059669;
    --color-primary-700: #047857;
    --color-primary-800: #065f46;
    --color-primary-900: #064e3b;

    /* Secondary: Energetic Yellow/Gold */
    --color-accent-400: #fbbf24;
    --color-accent-500: #f59e0b;

    /* Neutrals: Clean & Sharp */
    --color-white: #ffffff;
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    /* Body Text */
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;
    /* Headings */

    /* Semantic */
    --color-success: var(--color-primary-500);
    --color-error: #ef4444;
    --color-warning: #f59e0b;

    /* --- Typography (Fluid & Modern) --- */
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-heading: 'Outfit', var(--font-sans);

    /* Fluid Type Scale (Desktop bases, scales down mobile) */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 2rem;
    --text-4xl: 3rem;
    /* Section Headers */
    --text-5xl: 4rem;
    /* Hero Main */

    /* Line Heights */
    --leading-tight: 1.1;
    --leading-snug: 1.3;
    --leading-normal: 1.5;
    --leading-relaxed: 1.625;

    /* --- Spacing System --- */
    --space-2: 0.5rem;
    --space-4: 1rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-24: 6rem;
    /* Section Padding */
    --space-32: 8rem;

    /* --- Effects --- */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 32px;
    --radius-pill: 9999px;

    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --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);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-glow: 0 0 20px rgba(16, 185, 129, 0.4);

    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- Reset & Base --- */
html {
    scroll-behavior: smooth;
    box-sizing: border-box;
    font-size: 100%;
}

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

body {
    font-family: var(--font-sans);
    line-height: var(--leading-relaxed);
    color: var(--color-gray-500);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* --- Typography --- */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    color: var(--color-gray-900);
    font-weight: 700;
    line-height: var(--leading-tight);
    letter-spacing: -0.02em;
    margin-bottom: var(--space-4);
}

h1 {
    font-size: var(--text-5xl);
}

h2 {
    font-size: var(--text-4xl);
}

h3 {
    font-size: var(--text-3xl);
}

h4 {
    font-size: var(--text-xl);
}

p {
    margin-bottom: var(--space-4);
}

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

ul {
    list-style: none;
}

/* --- Layout Wrappers --- */
.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.section {
    padding: var(--space-24) 0;
    position: relative;
}

/* --- Utilities --- */
.text-center {
    text-align: center;
}

.text-right {
    text-align: right;
}

.text-left {
    text-align: left;
}

.text-primary {
    color: var(--color-primary-500);
}

.text-accent {
    color: var(--color-accent-500);
}

.text-white {
    color: var(--color-white);
}

.bg-light {
    background-color: var(--color-gray-50);
}

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

.bg-dark {
    background-color: var(--color-gray-900);
    color: var(--color-white);
}

.bg-gradient-primary {
    background: linear-gradient(135deg, var(--color-primary-50) 0%, var(--color-white) 100%);
}

.grid {
    display: grid;
    gap: var(--space-8);
}

.grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

.items-center {
    align-items: center;
}

.justify-center {
    justify-content: center;
}

.justify-between {
    justify-content: space-between;
}

.gap-2 {
    gap: var(--space-2);
}

.gap-4 {
    gap: var(--space-4);
}

.gap-8 {
    gap: var(--space-8);
}

.hidden-mobile {
    display: block;
}

.hidden-desktop {
    display: none;
}

/* --- Components --- */

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    font-weight: 600;
    border-radius: var(--radius-pill);
    transition: var(--transition);
    cursor: pointer;
    font-size: var(--text-base);
    white-space: nowrap;
    border: 2px solid transparent;
}

.btn-primary {
    background-color: var(--color-primary-500);
    color: var(--color-white);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    background-color: var(--color-primary-600);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-primary-600);
    border-color: var(--color-primary-200);
}

.btn-secondary:hover {
    border-color: var(--color-primary-500);
    background-color: var(--color-primary-50);
}

.btn-white {
    background-color: var(--color-white);
    color: var(--color-primary-700);
}

.btn-white:hover {
    background-color: var(--color-accent-400);
    color: var(--color-gray-900);
}

/* Cards */
.card {
    background-color: var(--color-white);
    padding: var(--space-8);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-gray-100);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-primary-200);
}

/* Feature Icon Wrapper */
.icon-box {
    width: 64px;
    height: 64px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    font-size: 1.75rem;
    margin-bottom: var(--space-6);
    background-color: var(--color-primary-50);
    color: var(--color-primary-600);
    transition: var(--transition);
}

.card:hover .icon-box {
    background-color: var(--color-primary-500);
    color: var(--color-white);
}

/* --- Header & Navigation --- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: var(--space-4) 0;
    transition: var(--transition);
    background-color: transparent;
}

.header.scrolled {
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(12px);
    box-shadow: var(--shadow-sm);
    padding: var(--space-2) 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--color-gray-900);
}

.logo i {
    color: var(--color-primary-500);
}

.nav-menu {
    display: flex;
    gap: var(--space-8);
}

.nav-link {
    font-weight: 500;
    color: var(--color-gray-700);
    position: relative;
    padding: 0.5rem 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-primary-500);
    transition: var(--transition);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-primary-600);
}

.mobile-toggle {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--color-gray-800);
}

/* --- Forms --- */
.form-group {
    margin-bottom: var(--space-6);
}

.form-label {
    display: block;
    margin-bottom: var(--space-2);
    font-weight: 500;
    color: var(--color-gray-800);
}

.form-control {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 2px solid var(--color-gray-200);
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 1rem;
    transition: var(--transition);
    background-color: var(--color-gray-50);
}

.form-control:focus {
    outline: none;
    border-color: var(--color-primary-500);
    background-color: var(--color-white);
    box-shadow: 0 0 0 4px var(--color-primary-100);
}

/* --- Footer --- */
.footer {
    background-color: var(--color-gray-900);
    padding-top: var(--space-16);
    padding-bottom: var(--space-8);
    color: var(--color-gray-300);
}

.footer-heading {
    color: var(--color-white);
    font-size: var(--text-lg);
    margin-bottom: var(--space-6);
}

.footer-links li {
    margin-bottom: var(--space-2);
}

.footer-links a:hover {
    color: var(--color-primary-400);
    padding-left: 4px;
}

.footer-bottom {
    margin-top: var(--space-12);
    padding-top: var(--space-8);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    font-size: var(--text-sm);
}

/* --- Animations (AOS replacement/refill) --- */
[data-aos] {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

[data-aos].aos-animate {
    opacity: 1;
    transform: translateY(0);
}

/* --- Responsive Design --- */
@media (max-width: 1024px) {
    :root {
        --text-5xl: 3.5rem;
        --text-4xl: 2.5rem;
    }
}

@media (max-width: 768px) {
    :root {
        --text-5xl: 2.75rem;
        --text-4xl: 2rem;
        --text-3xl: 1.75rem;
        --space-24: 4rem;
    }

    .hidden-mobile {
        display: none;
    }

    .hidden-desktop {
        display: block;
    }

    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }

    /* Mobile Nav */
    .mobile-toggle {
        display: block;
    }

    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background-color: var(--color-white);
        flex-direction: column;
        padding: var(--space-8);
        gap: var(--space-4);
        border-bottom: 1px solid var(--color-gray-100);
        box-shadow: var(--shadow-lg);
        transform: translateY(-150%);
        transition: transform 0.3s ease-in-out;
        z-index: 999;
        text-align: center;
    }

    .nav-center.active .nav-menu {
        transform: translateY(0);
    }

    .hero {
        padding-top: var(--space-32);
    }
}