/* ===================================
   CSS VARIABLES & THEMING
   =================================== */
:root {
    /* Custom Color Palette from Brand */
    --color-primary: #103778;
    /* Blue */
    --color-primary-dark: #151F30;
    /* Navy Blue */
    --color-primary-light: #3D5A96;
    /* Light Blue */
    --color-secondary: #FF7A48;
    /* Coral Orange */
    --color-accent: #0593A2;
    /* Cyan/Turquesa */
    --color-accent-dark: #E3371E;
    /* Red Orange */

    /* Backgrounds - More White */
    --color-bg: #FFFFFF;
    /* Pure White */
    --color-bg-secondary: #F8F9FA;
    /* Light Gray */
    --color-bg-tertiary: #F0F2F5;
    /* Lighter Gray */
    --color-surface: #FFFFFF;
    /* White */
    --color-surface-elevated: #FCFCFD;
    /* Off White */

    /* Text Colors */
    --color-text: #151F30;
    /* Navy Blue for text */
    --color-text-secondary: #103778;
    /* Blue for secondary */
    --color-text-tertiary: #6C757D;
    /* Gray for tertiary */

    /* Borders */
    --color-border: #E0E4E8;
    /* Light border */
    --color-border-light: #F0F2F5;
    /* Very light border */

    /* Utility Colors */
    --color-success: #0593A2;
    /* Using cyan for success */
    --color-warning: #FF7A48;
    /* Using coral for warning */
    --color-error: #E3371E;
    /* Using red for error */
    --color-info: #103778;
    /* Using blue for info */

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Poppins', var(--font-primary);

    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;

    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;

    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;

    /* Z-index */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}

/* Dark Mode Variables */
[data-theme="dark"] {
    --color-bg: #0D1117;
    /* Very Dark Navy */
    --color-bg-secondary: #151F30;
    /* Navy Blue */
    --color-bg-tertiary: #1C2938;
    /* Dark Blue Gray */
    --color-surface: #151F30;
    /* Navy Blue */
    --color-surface-elevated: #1C2938;
    /* Dark Blue Gray */

    --color-text: #F8F9FA;
    /* Off White */
    --color-text-secondary: #B8C1CC;
    /* Light Gray */
    --color-text-tertiary: #8A94A0;
    /* Medium Gray */

    --color-border: #2C3E50;
    /* Dark border */
    --color-border-light: #1C2938;
    /* Darker border */

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6), 0 10px 10px -5px rgba(0, 0, 0, 0.4);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.7);
}

/* ===================================
   RESET & BASE STYLES
   =================================== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    transition: background-color var(--transition-base), color var(--transition-base);
    overflow-x: hidden;
}

/* ===================================
   TYPOGRAPHY
   =================================== */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-display);
    font-weight: var(--font-weight-bold);
    line-height: 1.2;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

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

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

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

h4 {
    font-size: var(--font-size-2xl);
}

h5 {
    font-size: var(--font-size-xl);
}

h6 {
    font-size: var(--font-size-lg);
}

p {
    margin-bottom: var(--spacing-md);
}

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

a:hover {
    color: var(--color-primary-dark);
}

/* ===================================
   LAYOUT
   =================================== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.container-fluid {
    width: 100%;
    padding: 0 var(--spacing-lg);
}

/* ===================================
   NAVIGATION
   =================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border-light);
    z-index: var(--z-sticky);
    transition: all var(--transition-base);
}

[data-theme="dark"] .navbar {
    background: rgba(15, 15, 20, 0.8);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-lg);
}

.nav-brand {
    flex-shrink: 0;
}

.logo {
    font-family: var(--font-display);
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-extrabold);
    margin: 0;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-accent {
    color: var(--color-text);
    -webkit-text-fill-color: var(--color-text);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-sm);
    align-items: center;
}

.nav-link {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-sm);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

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

.btn-login {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white !important;
    font-weight: var(--font-weight-semibold);
}

.btn-login:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.theme-toggle {
    width: 40px;
    height: 40px;
    border: none;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text);
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    background: var(--color-primary);
    color: white;
    transform: rotate(15deg);
}

.sun-icon {
    display: none;
}

.moon-icon {
    display: block;
}

[data-theme="dark"] .sun-icon {
    display: block;
}

[data-theme="dark"] .moon-icon {
    display: none;
}

.upla-logo {
    height: 40px;
    width: auto;
    object-fit: contain;
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.mobile-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background: var(--color-text);
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
}

/* ===================================
   HERO SECTION
   =================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-4xl) var(--spacing-lg);
    padding-top: calc(var(--spacing-4xl) + 80px);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
    animation: float 20s ease-in-out infinite;
}

.orb-1 {
    width: 500px;
    height: 500px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    top: -250px;
    right: -100px;
    animation-delay: 0s;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: linear-gradient(135deg, var(--color-accent), var(--color-primary));
    bottom: -200px;
    left: -100px;
    animation-delay: 7s;
}

.orb-3 {
    width: 350px;
    height: 350px;
    background: linear-gradient(135deg, var(--color-secondary), var(--color-accent));
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: 14s;
}

@keyframes float {

    0%,
    100% {
        transform: translate(0, 0) scale(1);
    }

    33% {
        transform: translate(30px, -30px) scale(1.1);
    }

    66% {
        transform: translate(-20px, 20px) scale(0.9);
    }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
}

.hero-title {
    font-size: clamp(2.5rem, 8vw, 4.5rem);
    font-weight: var(--font-weight-extrabold);
    margin-bottom: var(--spacing-lg);
    line-height: 1.1;
}

.title-line {
    display: block;
}

.gradient-text {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradientShift 5s ease infinite;
    background-size: 200% 200%;
}

@keyframes gradientShift {

    0%,
    100% {
        background-position: 0% 50%;
    }

    50% {
        background-position: 100% 50%;
    }
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-text-secondary);
    font-style: italic;
    margin-bottom: var(--spacing-2xl);
    font-weight: var(--font-weight-medium);
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-3xl);
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-lg);
    max-width: 600px;
    margin: 0 auto;
}

.stat-card {
    background: var(--color-surface);
    backdrop-filter: blur(10px);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
}

.stat-number {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-extrabold);
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: var(--font-weight-medium);
}

/* ===================================
   SECTIONS
   =================================== */
.units-preview,
.contact-info {
    padding: var(--spacing-4xl) var(--spacing-lg);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-title {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-md);
}

.section-description,
.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ===================================
   FOOTER
   =================================== */
.footer {
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-3xl) var(--spacing-lg) var(--spacing-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: var(--spacing-3xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-brand h3 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-sm);
}

.footer-brand p {
    color: var(--color-text-secondary);
    margin: 0;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.footer-column h4 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-md);
}

.footer-column ul {
    list-style: none;
}

.footer-column li {
    margin-bottom: var(--spacing-sm);
}

.footer-column a {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

.footer-column a:hover {
    color: var(--color-primary);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
}

.footer-bottom p {
    color: var(--color-text-tertiary);
    font-size: var(--font-size-sm);
    margin: 0;
}

/* ===================================
   RESPONSIVE
   =================================== */
@media (max-width: 1024px) {
    .nav-menu {
        display: none;
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--color-surface);
        flex-direction: column;
        padding: var(--spacing-lg);
        box-shadow: var(--shadow-xl);
        border-radius: 0 0 var(--radius-xl) var(--radius-xl);
    }

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

    .mobile-toggle {
        display: flex;
    }

    .mobile-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(6px, 6px);
    }

    .mobile-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .mobile-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(6px, -6px);
    }
}

@media (max-width: 768px) {
    .hero {
        padding: var(--spacing-3xl) var(--spacing-md);
        padding-top: calc(var(--spacing-3xl) + 70px);
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }

    .footer-links {
        grid-template-columns: 1fr;
    }
}