/* ============================================
   SIPTRUNK.AI - PROFESSIONAL STYLESHEET
   Modern, Responsive Design System
   ============================================ */

/* ============================================
   1. ROOT VARIABLES & RESET
   ============================================ */

:root {
    /* Colors */
    --primary-dark: #003366;
    --primary-light: #0066cc;
    --primary-hover: #004fa3;
    --secondary: #f5f7fa;
    --text-dark: #333;
    --text-light: #666;
    --border-light: #e5e5e5;
    --bg-light: #f5f5f5;
    --white: #ffffff;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 12px;
    --spacing-lg: 20px;
    --spacing-xl: 40px;
    --spacing-2xl: 60px;
    
    /* Sizes */
    --header-height: 60px;
    --max-width: 1400px;
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', sans-serif;
    --font-size-sm: 14px;
    --font-size-base: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 20px;
    --font-size-2xl: 36px;
    --font-size-3xl: 56px;
    
    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    
    /* Transitions */
    --transition: all 0.3s ease;
    --transition-fast: all 0.2s ease;
    --transition-slow: all 0.5s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background: var(--white);
    color: var(--text-dark);
    line-height: 1.6;
}

/* ============================================
   2. HEADER & NAVIGATION
   ============================================ */

header {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.header-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: var(--header-height);
}

/* Logo Styling */
.logo {
    display: flex;
    align-items: baseline;
    gap: 2px;
    font-size: var(--font-size-lg);
    font-weight: 600;
    text-decoration: none;
    color: var(--text-dark);
    transition: opacity var(--transition);
}

.logo:hover {
    opacity: 0.7;
}

.logo-sip {
    font-weight: 700;
    color: var(--primary-dark);
    text-decoration: underline;
    text-decoration-color: var(--primary-dark);
    text-decoration-thickness: 2px;
    text-underline-offset: 4px;
}

.logo-trunk {
    font-weight: 400;
    color: var(--primary-light);
}

.logo-ai {
    font-weight: 700;
    color: var(--primary-dark);
}

/* Desktop Navigation */
nav {
    display: flex;
    gap: var(--spacing-2xl);
    align-items: center;
}

nav a {
    text-decoration: none;
    color: var(--text-dark);
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: color var(--transition);
    position: relative;
}

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

nav a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-light);
    transition: width var(--transition);
}

nav a:hover::after {
    width: 100%;
}

/* Auth Buttons */
.auth-buttons {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

/* ============================================
   3. BUTTONS
   ============================================ */

.btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    text-decoration: none;
    display: inline-block;
}

.btn-login {
    background: transparent;
    color: var(--text-dark);
    border: 1px solid #ccc;
}

.btn-login:hover {
    background: var(--bg-light);
    border-color: #999;
}

.btn-signup {
    background: var(--primary-light);
    color: var(--white);
    border: none;
}

.btn-signup:hover {
    background: var(--primary-hover);
    box-shadow: 0 4px 12px rgba(0, 102, 204, 0.3);
}

.btn-primary {
    padding: 14px 32px;
    background: var(--primary-light);
    color: var(--white);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: var(--transition);
}

.btn-primary:hover {
    background: var(--primary-hover);
    box-shadow: 0 8px 20px rgba(0, 102, 204, 0.3);
    transform: translateY(-2px);
}

.btn-secondary {
    padding: 14px 32px;
    background: var(--white);
    color: var(--primary-light);
    border: 2px solid var(--primary-light);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
}

.btn-secondary:hover {
    background: #f0f7ff;
    box-shadow: 0 4px 12px rgba(0, 102, 204, 0.2);
}

/* CTA: SIP Checker button */
.btn-checker {
    padding: 14px 32px;
    background: var(--white);
    color: var(--primary-light);
    border: 2px solid var(--primary-light);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 700;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 12px rgba(0, 102, 204, 0.2);
    flex: 1 1 240px;
    text-align: center;
}

.btn-checker:hover {
    background: #f0f7ff;
    border-color: var(--primary-light);
    box-shadow: 0 4px 12px rgba(0, 102, 204, 0.2);
}

/* ============================================
   4. HAMBURGER MENU
   ============================================ */

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 6px;
    background: none;
    border: none;
    padding: var(--spacing-sm);
    z-index: 1001;
}

.hamburger span {
    width: 24px;
    height: 2.5px;
    background: var(--text-dark);
    border-radius: 2px;
    transition: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    transform-origin: center;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(10px, 10px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
    transform: translateX(-10px);
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* Mobile Navigation Menu */
.mobile-nav {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    flex-direction: column;
    padding: var(--spacing-lg);
    gap: var(--spacing-md);
    z-index: 999;
    animation: slideDown 0.4s ease;
    overflow-y: auto;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.mobile-nav a {
    text-decoration: none;
    color: var(--text-dark);
    font-size: var(--font-size-base);
    font-weight: 500;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    background: rgba(255, 255, 255, 0.5);
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.mobile-nav a:hover {
    color: var(--primary-light);
    background: rgba(0, 102, 204, 0.1);
    border-color: var(--primary-light);
}

.mobile-nav-auth {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(0, 0, 0, 0.1);
}

.mobile-nav-auth .btn {
    width: 100%;
    text-align: center;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-sm);
}

/* ============================================
   5. HERO SECTION
   ============================================ */

.hero {
    margin-top: var(--header-height);
    min-height: calc(100vh - var(--header-height));
    background: linear-gradient(135deg, var(--secondary) 0%, var(--white) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl) var(--spacing-lg);
}

.hero-container {
    max-width: 1000px;
    text-align: center;
}

.hero-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--text-dark);
    line-height: 1.2;
}

.hero-title .highlight {
    color: var(--primary-light);
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--text-light);
    margin-bottom: var(--spacing-2xl);
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* Navigation loading overlay (shared) */
.nav-loader {
    position: fixed;
    inset: 0;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 2000;
}

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

.nav-loader-card {
    background: #fff;
    border-radius: 14px;
    padding: 24px 28px;
    border: 1px solid #e6edfb;
    box-shadow: 0 18px 70px rgba(0, 60, 130, 0.12);
    display: grid;
    gap: 12px;
    justify-items: center;
    min-width: 260px;
}

.nav-loader-logo {
    display: inline-flex;
    align-items: baseline;
    gap: 4px;
    font-weight: 800;
    font-size: 22px;
    color: var(--primary-dark);
}

.nav-loader-logo span:nth-child(2) { color: var(--primary-light); font-weight: 600; }

.nav-spinner {
    width: 46px;
    height: 46px;
    border: 4px solid rgba(0, 102, 204, 0.14);
    border-top-color: var(--primary-light);
    border-radius: 50%;
    animation: spin 0.9s linear infinite;
}

.nav-loader-text { color: var(--text-light); font-weight: 600; }

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ============================================
   6. FEATURES SECTION
   ============================================ */

.features {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-2xl) var(--spacing-xl);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-2xl);
}

.feature-card {
    padding: var(--spacing-2xl);
    background: var(--white);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
    transition: var(--transition);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.feature-card:hover {
    border-color: var(--primary-light);
    box-shadow: 0 8px 24px rgba(0, 102, 204, 0.15);
    transform: translateY(-4px);
}

.feature-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-light), var(--primary-hover));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 28px;
    margin-bottom: var(--spacing-lg);
}

.feature-card h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-md);
    color: var(--text-dark);
}

.feature-card p {
    color: var(--text-light);
    line-height: 1.6;
}

/* ============================================
   7. COOKIE CONSENT BANNER
   ============================================ */

.cookie-consent {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(10px);
    padding: 24px var(--spacing-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-xl);
    z-index: 999;
    animation: slideUp 0.5s ease;
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.3);
}

.cookie-consent.hidden {
    display: none;
}

@keyframes slideUp {
    from {
        transform: translateY(100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.cookie-content {
    flex: 1;
    color: var(--white);
    font-size: var(--font-size-sm);
    line-height: 1.6;
}

.cookie-content h3 {
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-sm);
    color: var(--white);
}

.cookie-buttons {
    display: flex;
    gap: var(--spacing-md);
    flex-shrink: 0;
    flex-wrap: wrap;
}

.cookie-btn {
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    white-space: nowrap;
}

.cookie-accept {
    background: var(--primary-light);
    color: var(--white);
}

.cookie-accept:hover {
    background: var(--primary-hover);
    box-shadow: 0 4px 12px rgba(0, 102, 204, 0.4);
}

.cookie-reject {
    background: transparent;
    color: var(--white);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.cookie-reject:hover {
    border-color: rgba(255, 255, 255, 0.6);
    background: rgba(255, 255, 255, 0.1);
}

/* ============================================
   8. FOOTER
   ============================================ */

footer {
    background: var(--bg-light);
    border-top: 1px solid var(--border-light);
    padding: var(--spacing-2xl);
    text-align: center;
    color: #999;
    font-size: var(--font-size-sm);
}

/* ============================================
   9. RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 768px) {
    :root {
        --spacing-xl: 20px;
        --font-size-3xl: 36px;
        --font-size-2xl: 28px;
    }

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

    .hamburger {
        display: flex;
    }

    nav {
        display: none;
    }

    .auth-buttons {
        display: none;
    }

    .hero-title {
        font-size: var(--font-size-2xl);
    }

    .hero-subtitle {
        font-size: var(--font-size-base);
    }

    .hero-buttons {
        flex-direction: column;
    }

    .btn-primary, .btn-secondary {
        width: 100%;
    }

    .features {
        padding: var(--spacing-xl) var(--spacing-lg);
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }

    .cookie-consent {
        flex-direction: column;
        align-items: stretch;
        padding: var(--spacing-lg);
    }

    .cookie-buttons {
        width: 100%;
    }

    .cookie-btn {
        flex: 1;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-xl: 16px;
        --spacing-lg: 16px;
        --font-size-lg: 16px;
    }

    .logo {
        font-size: var(--font-size-base);
    }

    .feature-card {
        padding: var(--spacing-xl);
    }

    .hero {
        padding: var(--spacing-xl) var(--spacing-lg);
    }

    .cookie-content {
        font-size: 12px;
    }
}

/* ============================================
   10. UTILITY CLASSES
   ============================================ */

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

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

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

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

.mt-lg {
    margin-top: var(--spacing-2xl);
}

.mb-lg {
    margin-bottom: var(--spacing-2xl);
}

.py-lg {
    padding-top: var(--spacing-2xl);
    padding-bottom: var(--spacing-2xl);
}