/**
 * Frontend Styles
 * PHP Base Platform - Public-facing website
 * Clean, modern, responsive design
 */

/* ============================================
   1. FRONTEND VARIABLES
   ============================================ */
:root {
    --fe-primary: #4f46e5;
    --fe-primary-dark: #4338ca;
    --fe-secondary: #64748b;
    --fe-accent: #06b6d4;
    --fe-success: #10b981;
    --fe-warning: #f59e0b;
    --fe-danger: #ef4444;
    --fe-bg: #ffffff;
    --fe-bg-alt: #f8fafc;
    --fe-text: #1e293b;
    --fe-text-muted: #64748b;
    --fe-border: #e2e8f0;
    --fe-shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --fe-shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --fe-shadow-lg: 0 12px 32px rgba(0,0,0,0.12);
    --fe-radius: 12px;
    --fe-radius-lg: 20px;
    --fe-transition: 0.25s ease;
    --fe-navbar-height: 72px;
}

/* ============================================
   2. BASE
   ============================================ */
.fe-body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--fe-text);
    background: var(--fe-bg);
    line-height: 1.7;
    overflow-x: hidden;
}

.fe-body a {
    color: var(--fe-primary);
    text-decoration: none;
    transition: color var(--fe-transition);
}

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

/* ============================================
   3. FRONTEND HEADER / NAVBAR
   ============================================ */
.fe-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1030;
    height: var(--fe-navbar-height);
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--fe-border);
    transition: all var(--fe-transition);
}

.fe-header.scrolled {
    box-shadow: var(--fe-shadow-sm);
    height: 64px;
}

.fe-header .header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

.fe-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--fe-text);
    text-decoration: none;
}

.fe-logo i {
    color: var(--fe-primary);
    font-size: 1.75rem;
}

/* Desktop Navigation */
.fe-nav {
    display: flex;
    align-items: center;
    gap: 8px;
    list-style: none;
    padding: 0;
    margin: 0;
}

.fe-nav .nav-link {
    padding: 8px 16px;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--fe-text-muted);
    border-radius: 8px;
    transition: all var(--fe-transition);
    text-decoration: none;
    display: block;
}

.fe-nav .nav-link:hover,
.fe-nav .nav-link.active {
    color: var(--fe-primary);
    background: rgba(79,70,229,0.06);
}

/* Header Actions */
.fe-header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.fe-header-actions .btn-login {
    padding: 8px 20px;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--fe-primary);
    border: 1px solid var(--fe-primary);
    border-radius: 8px;
    background: transparent;
    transition: all var(--fe-transition);
    text-decoration: none;
    cursor: pointer;
}

.fe-header-actions .btn-login:hover {
    background: var(--fe-primary);
    color: #fff;
}

.fe-header-actions .btn-register {
    padding: 8px 20px;
    font-size: 0.875rem;
    font-weight: 600;
    color: #fff;
    background: var(--fe-primary);
    border: 1px solid var(--fe-primary);
    border-radius: 8px;
    transition: all var(--fe-transition);
    text-decoration: none;
    cursor: pointer;
}

.fe-header-actions .btn-register:hover {
    background: var(--fe-primary-dark);
}

/* Language Switcher */
.fe-lang-switch {
    position: relative;
}

.fe-lang-switch .lang-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border: 1px solid var(--fe-border);
    border-radius: 8px;
    background: transparent;
    font-size: 0.8125rem;
    color: var(--fe-text-muted);
    cursor: pointer;
    transition: all var(--fe-transition);
}

.fe-lang-switch .lang-btn:hover {
    border-color: var(--fe-primary);
    color: var(--fe-primary);
}

/* Mobile Hamburger */
.fe-hamburger {
    display: none;
    width: 44px;
    height: 44px;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    font-size: 1.25rem;
    color: var(--fe-text);
    cursor: pointer;
    border-radius: 8px;
    touch-action: manipulation;
}

.fe-hamburger:hover {
    background: var(--fe-bg-alt);
}

/* ============================================
   4. MOBILE MENU
   ============================================ */
.fe-mobile-menu {
    position: fixed;
    top: var(--fe-navbar-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(20px);
    z-index: 1020;
    padding: 24px;
    transform: translateX(100%);
    transition: transform var(--fe-transition);
    overflow-y: auto;
}

.fe-mobile-menu.open {
    transform: translateX(0);
}

.fe-mobile-menu .mobile-nav {
    list-style: none;
    padding: 0;
    margin: 0;
}

.fe-mobile-menu .mobile-nav .nav-link {
    display: block;
    padding: 14px 0;
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--fe-text);
    border-bottom: 1px solid var(--fe-border);
    text-decoration: none;
}

.fe-mobile-menu .mobile-nav .nav-link:hover {
    color: var(--fe-primary);
}

.fe-mobile-menu .mobile-actions {
    margin-top: 24px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.fe-mobile-menu .mobile-actions .btn {
    width: 100%;
    text-align: center;
    padding: 14px;
}

/* ============================================
   5. HERO SECTION
   ============================================ */
.fe-hero {
    position: relative;
    padding: 160px 24px 100px;
    background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 50%, #2563eb 100%);
    overflow: hidden;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.fe-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.fe-hero::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 200px;
    background: linear-gradient(to top, var(--fe-bg), transparent);
}

.fe-hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    text-align: center;
}

.fe-hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    color: #fff;
    margin-bottom: 20px;
    line-height: 1.15;
    letter-spacing: -0.03em;
}

.fe-hero p {
    font-size: 1.25rem;
    color: rgba(255,255,255,0.85);
    margin-bottom: 36px;
    line-height: 1.7;
}

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

.fe-hero .btn-primary {
    padding: 14px 36px;
    font-size: 1rem;
    font-weight: 600;
    color: var(--fe-primary);
    background: #fff;
    border: none;
    border-radius: var(--fe-radius);
    transition: all var(--fe-transition);
    cursor: pointer;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.15);
}

.fe-hero .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.2);
    background: #f8fafc;
}

.fe-hero .btn-secondary {
    padding: 14px 36px;
    font-size: 1rem;
    font-weight: 600;
    color: #fff;
    background: rgba(255,255,255,0.15);
    border: 1px solid rgba(255,255,255,0.3);
    border-radius: var(--fe-radius);
    transition: all var(--fe-transition);
    cursor: pointer;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    backdrop-filter: blur(8px);
}

.fe-hero .btn-secondary:hover {
    background: rgba(255,255,255,0.25);
    transform: translateY(-2px);
}

/* ============================================
   6. SECTION STYLES
   ============================================ */
.fe-section {
    padding: 80px 24px;
    max-width: 1280px;
    margin: 0 auto;
}

.fe-section-alt {
    background: var(--fe-bg-alt);
}

.fe-section-header {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 56px;
}

.fe-section-header h2 {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--fe-text);
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.fe-section-header p {
    font-size: 1.125rem;
    color: var(--fe-text-muted);
    line-height: 1.7;
}

/* ============================================
   7. SERVICE / FEATURE CARDS
   ============================================ */
.fe-features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.fe-feature-card {
    background: #fff;
    border: 1px solid var(--fe-border);
    border-radius: var(--fe-radius-lg);
    padding: 36px 28px;
    transition: all var(--fe-transition);
    position: relative;
    overflow: hidden;
}

.fe-feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--fe-primary), var(--fe-accent));
    transform: scaleX(0);
    transition: transform var(--fe-transition);
}

.fe-feature-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--fe-shadow-lg);
    border-color: transparent;
}

.fe-feature-card:hover::before {
    transform: scaleX(1);
}

.fe-feature-card .feature-icon {
    width: 60px;
    height: 60px;
    border-radius: 14px;
    background: linear-gradient(135deg, rgba(79,70,229,0.1), rgba(124,58,237,0.1));
    color: var(--fe-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 24px;
}

.fe-feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--fe-text);
    margin-bottom: 12px;
}

.fe-feature-card p {
    font-size: 0.9375rem;
    color: var(--fe-text-muted);
    line-height: 1.7;
    margin: 0;
}

/* ============================================
   8. TESTIMONIAL CAROUSEL
   ============================================ */
.fe-testimonials {
    position: relative;
}

.fe-testimonial-card {
    background: #fff;
    border: 1px solid var(--fe-border);
    border-radius: var(--fe-radius-lg);
    padding: 36px;
    text-align: center;
    transition: all var(--fe-transition);
}

.fe-testimonial-card:hover {
    box-shadow: var(--fe-shadow-md);
}

.fe-testimonial-card .quote-icon {
    font-size: 2rem;
    color: var(--fe-primary);
    opacity: 0.3;
    margin-bottom: 16px;
}

.fe-testimonial-card .quote-text {
    font-size: 1.0625rem;
    color: var(--fe-text);
    line-height: 1.8;
    font-style: italic;
    margin-bottom: 24px;
}

.fe-testimonial-card .testimonial-author {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 14px;
}

.fe-testimonial-card .author-avatar {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    object-fit: cover;
}

.fe-testimonial-card .author-info {
    text-align: left;
}

.fe-testimonial-card .author-name {
    font-weight: 600;
    color: var(--fe-text);
    font-size: 0.9375rem;
}

.fe-testimonial-card .author-title {
    font-size: 0.8125rem;
    color: var(--fe-text-muted);
}

.fe-testimonial-card .rating {
    display: flex;
    gap: 3px;
    justify-content: center;
    margin-top: 16px;
}

.fe-testimonial-card .rating i {
    color: var(--fe-warning);
    font-size: 0.875rem;
}

/* ============================================
   9. BLOG POST CARDS
   ============================================ */
.fe-blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 28px;
}

.fe-blog-card {
    background: #fff;
    border: 1px solid var(--fe-border);
    border-radius: var(--fe-radius-lg);
    overflow: hidden;
    transition: all var(--fe-transition);
    text-decoration: none;
    color: inherit;
    display: block;
}

.fe-blog-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--fe-shadow-lg);
    color: inherit;
}

.fe-blog-card .blog-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    transition: transform var(--fe-transition);
}

.fe-blog-card:hover .blog-image {
    transform: scale(1.05);
}

.fe-blog-card .blog-image-wrap {
    overflow: hidden;
}

.fe-blog-card .blog-body {
    padding: 24px;
}

.fe-blog-card .blog-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 12px;
    font-size: 0.8125rem;
    color: var(--fe-text-muted);
}

.fe-blog-card .blog-meta i {
    margin-right: 4px;
}

.fe-blog-card .blog-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--fe-text);
    margin-bottom: 10px;
    line-height: 1.4;
}

.fe-blog-card .blog-excerpt {
    font-size: 0.875rem;
    color: var(--fe-text-muted);
    line-height: 1.7;
    margin: 0;
}

/* ============================================
   10. CONTACT FORM
   ============================================ */
.fe-contact-form {
    max-width: 640px;
    margin: 0 auto;
}

.fe-form-group {
    margin-bottom: 20px;
}

.fe-form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--fe-text);
    margin-bottom: 8px;
}

.fe-form-input {
    width: 100%;
    padding: 12px 16px;
    font-size: 0.9375rem;
    color: var(--fe-text);
    background: #fff;
    border: 1px solid var(--fe-border);
    border-radius: 10px;
    transition: all var(--fe-transition);
    font-family: inherit;
}

.fe-form-input:focus {
    outline: none;
    border-color: var(--fe-primary);
    box-shadow: 0 0 0 4px rgba(79,70,229,0.1);
}

.fe-form-input::placeholder {
    color: #94a3b8;
}

textarea.fe-form-input {
    min-height: 140px;
    resize: vertical;
}

.fe-btn-submit {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 36px;
    font-size: 1rem;
    font-weight: 600;
    color: #fff;
    background: var(--fe-primary);
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: all var(--fe-transition);
    font-family: inherit;
    width: 100%;
}

.fe-btn-submit:hover {
    background: var(--fe-primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(79,70,229,0.3);
}

/* ============================================
   11. FRONTEND FOOTER
   ============================================ */
.fe-footer {
    background: #0f172a;
    color: #94a3b8;
    padding: 64px 24px 0;
}

.fe-footer-inner {
    max-width: 1280px;
    margin: 0 auto;
}

.fe-footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 48px;
    padding-bottom: 48px;
}

.fe-footer-brand .footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 16px;
    text-decoration: none;
}

.fe-footer-brand .footer-logo i {
    color: var(--fe-primary);
}

.fe-footer-brand p {
    font-size: 0.9375rem;
    line-height: 1.7;
    color: #94a3b8;
    margin-bottom: 20px;
}

.fe-social-links {
    display: flex;
    gap: 10px;
}

.fe-social-links a {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: rgba(255,255,255,0.06);
    color: #94a3b8;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9375rem;
    transition: all var(--fe-transition);
    text-decoration: none;
}

.fe-social-links a:hover {
    background: var(--fe-primary);
    color: #fff;
    transform: translateY(-2px);
}

.fe-footer-column h4 {
    font-size: 1rem;
    font-weight: 600;
    color: #fff;
    margin-bottom: 20px;
}

.fe-footer-column ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.fe-footer-column ul li {
    margin-bottom: 12px;
}

.fe-footer-column ul li a {
    color: #94a3b8;
    font-size: 0.9375rem;
    transition: color var(--fe-transition);
    text-decoration: none;
}

.fe-footer-column ul li a:hover {
    color: #fff;
}

.fe-footer-column .contact-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 16px;
    font-size: 0.9375rem;
}

.fe-footer-column .contact-item i {
    color: var(--fe-primary);
    margin-top: 4px;
    font-size: 0.875rem;
}

/* Newsletter */
.fe-newsletter {
    margin-top: 8px;
}

.fe-newsletter .newsletter-form {
    display: flex;
    gap: 8px;
}

.fe-newsletter input {
    flex: 1;
    padding: 12px 16px;
    font-size: 0.875rem;
    color: #fff;
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 10px;
    outline: none;
    transition: all var(--fe-transition);
    font-family: inherit;
    min-width: 0;
}

.fe-newsletter input:focus {
    border-color: var(--fe-primary);
}

.fe-newsletter input::placeholder {
    color: #64748b;
}

.fe-newsletter button {
    padding: 12px 20px;
    font-size: 0.875rem;
    font-weight: 600;
    color: #fff;
    background: var(--fe-primary);
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: all var(--fe-transition);
    white-space: nowrap;
}

.fe-newsletter button:hover {
    background: var(--fe-primary-dark);
}

/* Footer Bottom */
.fe-footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.06);
    padding: 24px 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.875rem;
    flex-wrap: wrap;
    gap: 12px;
}

.fe-footer-bottom a {
    color: #94a3b8;
    text-decoration: none;
    transition: color var(--fe-transition);
}

.fe-footer-bottom a:hover {
    color: #fff;
}

/* ============================================
   12. BACK TO TOP
   ============================================ */
.fe-back-to-top {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--fe-primary);
    color: #fff;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    cursor: pointer;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--fe-transition);
    box-shadow: 0 4px 16px rgba(79,70,229,0.3);
    touch-action: manipulation;
}

.fe-back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.fe-back-to-top:hover {
    background: var(--fe-primary-dark);
    transform: translateY(-2px);
}

/* ============================================
   13. ALERTS / FLASH MESSAGES
   ============================================ */
.fe-alert {
    padding: 14px 20px;
    border-radius: 10px;
    font-size: 0.9375rem;
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.fe-alert i {
    font-size: 1.125rem;
    flex-shrink: 0;
}

.fe-alert-success {
    background: #ecfdf5;
    color: #047857;
    border: 1px solid #a7f3d0;
}

.fe-alert-error {
    background: #fef2f2;
    color: #b91c1c;
    border: 1px solid #fecaca;
}

.fe-alert-warning {
    background: #fffbeb;
    color: #b45309;
    border: 1px solid #fde68a;
}

.fe-alert-info {
    background: #eff6ff;
    color: #1d4ed8;
    border: 1px solid #bfdbfe;
}

/* ============================================
   14. RESPONSIVE
   ============================================ */
@media (max-width: 991px) {
    .fe-nav,
    .fe-header-actions {
        display: none;
    }
    .fe-hamburger {
        display: flex;
    }
    .fe-hero h1 {
        font-size: 2.5rem;
    }
    .fe-hero p {
        font-size: 1.0625rem;
    }
    .fe-footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }
}

@media (max-width: 768px) {
    .fe-section {
        padding: 56px 16px;
    }
    .fe-section-header h2 {
        font-size: 1.75rem;
    }
    .fe-hero {
        padding: 120px 16px 80px;
        min-height: auto;
    }
    .fe-hero h1 {
        font-size: 2rem;
    }
    .fe-hero p {
        font-size: 1rem;
    }
    .fe-hero-btns {
        flex-direction: column;
        align-items: center;
    }
    .fe-hero-btns .btn-primary,
    .fe-hero-btns .btn-secondary {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }
    .fe-footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    .fe-footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 576px) {
    .fe-hero h1 {
        font-size: 1.625rem;
    }
    .fe-section-header h2 {
        font-size: 1.5rem;
    }
    .fe-feature-card {
        padding: 28px 20px;
    }
    .fe-blog-grid {
        grid-template-columns: 1fr;
    }
    .fe-newsletter .newsletter-form {
        flex-direction: column;
    }
}

@media (max-width: 280px) {
    .fe-hero h1 {
        font-size: 1.375rem;
    }
    .fe-section {
        padding: 40px 12px;
    }
    .fe-feature-card {
        padding: 24px 16px;
    }
}

/* ============================================
   15. PAGE CONTENT AREA
   ============================================ */
.fe-content {
    padding-top: var(--fe-navbar-height);
    min-height: 100vh;
}

.fe-page-header {
    background: linear-gradient(135deg, var(--fe-bg-alt), #fff);
    padding: 64px 24px;
    text-align: center;
    border-bottom: 1px solid var(--fe-border);
}

.fe-page-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--fe-text);
    margin-bottom: 12px;
}

.fe-page-header p {
    font-size: 1.125rem;
    color: var(--fe-text-muted);
    max-width: 600px;
    margin: 0 auto;
}

/* ============================================
   16. SCROLL ANIMATIONS
   ============================================ */
.fe-fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fe-fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}