/* ==============================================
   GLOBAL STYLES & VARIABLES
   ============================================== */

:root {
    /* Colors */
    --primary: #2563eb;
    --primary-dark: #1e40af;
    --primary-light: #3b82f6;
    --secondary: #64748b;
    --accent: #f59e0b;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;

    /* Backgrounds */
    --bg-white: #ffffff;
    --bg-light: #f8fafc;
    --bg-lighter: #f1f5f9;
    --bg-dark: #0f172a;

    /* Text Colors */
    --text-dark: #0f172a;
    --text-muted: #64748b;
    --text-light: #ffffff;

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

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;

    /* 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);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
}

/* ==============================================
   RESET & BASE STYLES
   ============================================== */

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-white);
    color: var(--text-dark);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ==============================================
   TYPOGRAPHY
   ============================================== */

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--text-dark);
}

h1 {
    font-size: 3rem;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 2.25rem;
    letter-spacing: -0.015em;
}

h3 {
    font-size: 1.75rem;
}

h4 {
    font-size: 1.25rem;
}

h5 {
    font-size: 1.125rem;
}

h6 {
    font-size: 1rem;
}

p {
    margin-bottom: var(--spacing-sm);
    color: var(--text-muted);
    font-size: 1rem;
}

strong {
    font-weight: 600;
    color: var(--text-dark);
}

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

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

/* ==============================================
   CONTAINER & LAYOUT
   ============================================== */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

section {
    padding: var(--spacing-2xl) 0;
}

section.full-width {
    padding: 0;
}

/* ==============================================
   NAVIGATION
   ============================================== */

.navbar {
    background-color: var(--bg-white);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: all var(--transition-normal);
}

/* Navigation V3 - Elegant Version */
.navbar-v3 {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid #dbeafe;
    box-shadow: none;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);

}

.logo-icon {
    font-size: 1.75rem;
}

.logo-text {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    cursor: pointer;
    transition: transform 0.3s ease;
}

.logo-link:hover {
    transform: scale(1.05);
}

.logo-link:active {
    transform: scale(0.98);
}

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

.nav-item .nav-link {
    font-weight: 500;
    color: var(--text-dark);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-bottom: 2px solid transparent;
    transition: all var(--transition-fast);
}

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

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 0.375rem;
}

.hamburger span {
    width: 1.5rem;
    height: 0.25rem;
    background-color: var(--text-dark);
    transition: all var(--transition-normal);
    border-radius: var(--radius-full);
}

/* ==============================================
   BUTTONS
   ============================================== */

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 1rem;
    text-align: center;
    cursor: pointer;
    border: none;
    transition: all var(--transition-fast);
    text-decoration: none;
}

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

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

.btn-secondary {
    background-color: var(--bg-lighter);
    color: var(--primary);
    border: 2px solid var(--primary);
}

.btn-secondary:hover {
    background-color: var(--primary);
    color: var(--text-light);
    transform: translateY(-2px);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

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

/* ==============================================
   FORMS
   ============================================== */

input[type="text"],
input[type="email"],
input[type="tel"],
input[type="number"],
textarea,
select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--bg-lighter);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 1rem;
    transition: all var(--transition-fast);
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="tel"]:focus,
input[type="number"]:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

textarea {
    resize: vertical;
    min-height: 120px;
}

label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    color: var(--text-dark);
    font-size: 0.95rem;
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group.checkbox {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.form-group.checkbox input {
    width: auto;
}

.form-group.checkbox label {
    margin-bottom: 0;
}

.error-message {
    display: block;
    color: var(--danger);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

.success-message {
    background-color: #dcfce7;
    color: #166534;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-top: var(--spacing-md);
    border-left: 4px solid var(--success);
}

/* ==============================================
   FOOTER
   ============================================== */

.footer {
    background-color: var(--bg-dark);
    color: var(--text-light);
    text-align: center;
    padding: var(--spacing-2xl) 0;
    margin-top: var(--spacing-2xl);
}

.footer p {
    color: var(--text-light);
    opacity: 0.8;
}

/* ==============================================
   UTILITIES
   ============================================== */

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

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

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }

.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }

.pt-1 { padding-top: var(--spacing-sm); }
.pt-2 { padding-top: var(--spacing-md); }
.pt-3 { padding-top: var(--spacing-lg); }

.pb-1 { padding-bottom: var(--spacing-sm); }
.pb-2 { padding-bottom: var(--spacing-md); }
.pb-3 { padding-bottom: var(--spacing-lg); }

/* ==============================================
   RESPONSIVE
   ============================================== */

@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    h3 {
        font-size: 1.25rem;
    }

    .container {
        padding: 0 var(--spacing-md);
    }

    section {
        padding: var(--spacing-xl) 0;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--bg-white);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        padding: var(--spacing-lg) 0;
        gap: 0;
        box-shadow: var(--shadow-lg);
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-item .nav-link {
        padding: var(--spacing-md) 0;
        border-bottom: none;
        border-bottom: 1px solid var(--bg-lighter);
    }

    .hamburger {
        display: flex;
    }

    .hamburger.active span:nth-child(1) {
        transform: rotate(-45deg) translate(-5px, 6px);
    }

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

    .hamburger.active span:nth-child(3) {
        transform: rotate(45deg) translate(-5px, -6px);
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.5rem;
    }

    h2 {
        font-size: 1.25rem;
    }

    .btn {
        width: 100%;
    }

    .container {
        padding: 0 var(--spacing-md);
    }
}