/* ==========================================
   SkillSync AI - Responsive Stylesheet
   Mobile-First Responsive Design
   ========================================== */

/* Responsive Variables */
:root {
    /* Breakpoints */
    --breakpoint-xs: 320px;
    --breakpoint-sm: 480px;
    --breakpoint-md: 768px;
    --breakpoint-lg: 1024px;
    --breakpoint-xl: 1200px;
    --breakpoint-xxl: 1440px;
    
    /* Mobile Spacing */
    --mobile-padding: 1rem;
    --mobile-margin: 0.75rem;
    --mobile-section-padding: 2rem 0;
    
    /* Touch Target Sizes */
    --touch-target-min: 44px;
    --touch-target-comfortable: 48px;
    
    /* Mobile Typography */
    --mobile-h1: 2.25rem;
    --mobile-h2: 1.875rem;
    --mobile-h3: 1.5rem;
    --mobile-body: 1rem;
    --mobile-small: 0.875rem;
}

/* ==========================================
   Base Responsive Utilities
   ========================================== */

/* Mobile-First Display Utilities */
.show-mobile { display: none; }
.hide-mobile { display: block; }
.show-tablet { display: none; }
.hide-tablet { display: block; }
.show-desktop { display: block; }
.hide-desktop { display: none; }

/* ==========================================
   Desktop/Laptop (1024px - 1199px)
   ========================================== */
@media (max-width: 1199px) and (min-width: 1024px) {
    .container {
        max-width: 960px;
        padding: 0 2rem;
    }
    
    /* Header Adjustments */
    .nav-menu {
        gap: 1.5rem;
    }
    
    .nav-buttons {
        gap: 0.75rem;
    }
    
    /* Hero Section */
    .hero-title {
        font-size: 3.5rem;
    }
    
    .hero-buttons {
        gap: 1rem;
    }
    
    .hero-stats {
        grid-template-columns: repeat(4, 1fr);
        gap: 1.5rem;
    }
    
    /* Dashboard */
    .dashboard-sidebar {
        width: 240px;
    }
    
    .dashboard-main {
        margin-left: 240px;
    }
    
    .dashboard-content {
        padding: 1.5rem;
    }
    
    .dashboard-grid.four-column {
        grid-template-columns: repeat(2, 1fr);
    }
    
    /* Features */
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }
    
    /* About Section */
    .about-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .about-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    /* Footer */
    .footer-content {
        grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
        gap: 1.5rem;
    }
}

/* ==========================================
   Tablet Landscape (768px - 1023px)
   ========================================== */
@media (max-width: 1023px) and (min-width: 768px) {
    .show-tablet { display: block; }
    .hide-tablet { display: none; }
    
    .container {
        max-width: 720px;
        padding: 0 1.5rem;
    }
    
    /* Header */
    .navbar {
        padding: 0 1rem;
    }
    
    .nav-menu {
        gap: 1rem;
    }
    
    .logo {
        font-size: 1.5rem;
    }
    
    .logo i {
        font-size: 1.75rem;
    }
    
    /* Hero Section */
    .hero {
        padding: calc(var(--header-height) + 2rem) 0 2rem;
        min-height: auto;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }
    
    .hero-title {
        font-size: 3rem;
        color: var(--text-primary) !important;
        font-weight: var(--font-weight-black) !important;
    }
    
    .hero-description {
        font-size: 1.125rem;
        max-width: none;
        color: var(--text-secondary) !important;
    }
    
    .hero-buttons {
        justify-content: center;
        flex-wrap: wrap;
        gap: 1rem;
    }
    
    .hero-image {
        order: -1;
        margin-bottom: 1rem;
    }
    
    .hero-card {
        min-width: 260px;
    }
    
    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }
    
    /* Features */
    .features-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .feature-card {
        text-align: center;
    }
    
    .feature-card h3 {
        color: var(--text-primary) !important;
        font-weight: var(--font-weight-semibold) !important;
    }
    
    .feature-card p {
        color: var(--text-secondary) !important;
    }
    
    /* How It Works */
    .process-tabs {
        gap: 0.5rem;
    }
    
    .tab-button {
        padding: 10px 16px;
        font-size: 0.9rem;
    }
    
    .step {
        grid-template-columns: auto 1fr;
        gap: 1rem;
        text-align: left;
    }
    
    .step-visual {
        display: none;
    }
    
    .step:not(:last-child)::after {
        left: 30px;
        height: 40px;
    }
    
    .step-content h3 {
        color: var(--text-primary) !important;
        font-weight: var(--font-weight-semibold) !important;
    }
    
    .step-content p {
        color: var(--text-secondary) !important;
    }
    
    /* Success Stories */
    .stories-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .story-info h4 {
        color: var(--text-primary) !important;
    }
    
    .story-text {
        color: var(--text-secondary) !important;
    }
    
    /* About */
    .about-content {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }
    
    .about-features {
        align-items: center;
    }
    
    .about-feature {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }
    
    .about-feature h4 {
        color: var(--text-primary) !important;
    }
    
    .about-feature p {
        color: var(--text-secondary) !important;
    }
    
    .about-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .stat-card h3 {
        color: var(--primary-color) !important;
        font-weight: var(--font-weight-bold) !important;
    }
    
    .stat-card p {
        color: var(--text-secondary) !important;
    }
    
    /* CTA */
    .cta-title {
        font-size: 2.5rem;
        color: var(--text-white) !important;
    }
    
    .cta-description {
        color: var(--text-white) !important;
    }
    
    .cta-buttons {
        gap: 1rem;
    }
    
    /* Footer */
    .footer-content {
        grid-template-columns: 1fr 1fr;
        gap: 2rem;
    }
    
    .footer-bottom-content {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    /* Dashboard */
    .dashboard-sidebar {
        width: 70px;
    }
    
    .dashboard-main {
        margin-left: 70px;
    }
    
    .sidebar-section-title,
    .sidebar-menu-text,
    .sidebar-user-details {
        display: none;
    }
    
    .dashboard-grid.two-column,
    .dashboard-grid.three-column,
    .dashboard-grid.four-column {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .dashboard-search input {
        width: 200px;
    }
    
    /* Match Cards */
    .match-header {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }
    
    .match-info h3 {
        color: var(--text-primary) !important;
    }
    
    .match-info p {
        color: var(--text-secondary) !important;
    }
    
    .match-actions {
        justify-content: center;
    }
    
    /* Profile */
    .profile-stats {
        grid-template-columns: repeat(3, 1fr);
    }
    
    /* Chat */
    .chat-container {
        height: 500px;
    }
    
    .message {
        max-width: 85%;
    }
    
    /* Forms */
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .form-actions {
        justify-content: center;
    }
    
    /* Modal */
    .modal-content {
        width: 90%;
        max-width: 500px;
    }
}

/* ==========================================
   Mobile Landscape / Small Tablet (480px - 767px)
   ========================================== */
@media (max-width: 767px) and (min-width: 480px) {
    .container {
        padding: 0 1rem;
    }
    
    /* Header */
    .nav-menu {
        display: none;
    }
    
    .hamburger {
        display: flex;
    }
    
    /* Hero */
    .hero-title {
        font-size: 2.5rem;
        line-height: 1.2;
        color: var(--text-primary) !important;
        font-weight: var(--font-weight-black) !important;
    }
    
    .hero-description {
        font-size: 1rem;
        color: var(--text-secondary) !important;
    }
    
    .hero-buttons {
        flex-direction: column;
        gap: 0.75rem;
        align-items: stretch;
    }
    
    .btn-primary,
    .btn-secondary {
        width: 100%;
        justify-content: center;
    }
    
    .hero-stats {
        grid-template-columns: 1fr 1fr;
        gap: 1rem;
    }
    
    .stat-number {
        font-size: 2rem;
        color: var(--primary-color) !important;
        font-weight: var(--font-weight-black) !important;
    }
    
    .stat-label {
        color: var(--text-secondary) !important;
    }
    
    /* Sections */
    .section-title {
        color: var(--text-primary) !important;
        font-weight: var(--font-weight-bold) !important;
    }
    
    .section-subtitle {
        color: var(--text-secondary) !important;
    }
    
    /* Features */
    .feature-card {
        padding: 1.5rem;
    }
    
    .feature-icon {
        width: 60px;
        height: 60px;
        margin: 0 auto 1rem;
    }
    
    /* Process Steps */
    .step-number {
        width: 60px;
        height: 60px;
        font-size: 1.25rem;
    }
    
    .step:not(:last-child)::after {
        left: 25px;
    }
    
    /* Story Cards */
    .story-header {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }
    
    /* About Stats */
    .about-stats {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    /* CTA */
    .cta-title {
        font-size: 2rem;
        color: var(--text-white) !important;
    }
    
    .cta-buttons {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    /* Footer */
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 1.5rem;
    }
    
    .footer-section h4 {
        color: var(--text-white) !important;
    }
    
    .social-links {
        justify-content: center;
    }
    
    /* Dashboard Mobile Overlay */
    .dashboard-sidebar {
        position: fixed;
        transform: translateX(-100%);
        width: 280px;
        z-index: 999;
        transition: transform 0.3s ease;
    }
    
    .dashboard-sidebar.mobile-open {
        transform: translateX(0);
    }
    
    .dashboard-main {
        margin-left: 0;
    }
    
    .dashboard-overlay {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 998;
        display: none;
    }
    
    .dashboard-overlay.active {
        display: block;
    }
    
    .mobile-menu-toggle {
        display: flex;
        width: 40px;
        height: 40px;
        border: none;
        background: transparent;
        cursor: pointer;
        flex-direction: column;
        justify-content: center;
        gap: 4px;
    }
    
    .mobile-menu-toggle span {
        width: 100%;
        height: 2px;
        background: var(--text-primary);
        border-radius: 1px;
        transition: var(--transition-normal);
    }
    
    .dashboard-content {
        padding: 1rem;
    }
    
    .dashboard-header {
        padding: 0 1rem;
        flex-wrap: wrap;
        gap: 1rem;
    }
    
    .dashboard-title {
        color: var(--text-primary) !important;
        font-weight: var(--font-weight-semibold) !important;
    }
    
    .dashboard-search {
        order: 3;
        width: 100%;
    }
    
    .dashboard-search input {
        width: 100%;
        color: var(--text-primary) !important;
    }
    
    /* Cards */
    .dashboard-card-title {
        color: var(--text-primary) !important;
        font-weight: var(--font-weight-semibold) !important;
    }
    
    .match-actions {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    .btn-match-action {
        width: 100%;
    }
    
    /* Profile */
    .profile-stats {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    /* Chat */
    .chat-input-container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .chat-send-btn {
        width: 100%;
    }
}

/* ==========================================
   Mobile Portrait (320px - 479px)
   ========================================== */
@media (max-width: 479px) {
    .show-mobile { display: block; }
    .hide-mobile { display: none; }
    
    :root {
        --spacing-xl: 1rem;
        --spacing-2xl: 1.5rem;
        --spacing-3xl: 2rem;
    }
    
    .container {
        padding: 0 0.75rem;
    }
    
    /* Header */
    .header {
        height: 60px;
    }
    
    .navbar {
        height: 60px;
        padding: 0 0.75rem;
    }
    
    .logo {
        font-size: 1.25rem;
    }
    
    .logo i {
        font-size: 1.5rem;
    }
    
    /* Hero */
    .hero {
        padding: calc(60px + 1rem) 0 1.5rem;
        min-height: auto;
    }
    
    .hero-title {
        font-size: var(--mobile-h1);
        margin-bottom: 1rem;
        color: var(--text-primary) !important;
        font-weight: var(--font-weight-black) !important;
    }
    
    .hero-description {
        font-size: var(--mobile-body);
        margin-bottom: 1.5rem;
        color: var(--text-secondary) !important;
        font-weight: var(--font-weight-normal) !important;
    }
    
    .hero-buttons {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    .btn-primary,
    .btn-secondary {
        padding: 14px 20px;
        font-size: 1rem;
        color: var(--text-white) !important;
        font-weight: var(--font-weight-semibold) !important;
    }
    
    .hero-image {
        display: none; /* Hide complex animation on very small screens */
    }
    
    .hero-stats {
        grid-template-columns: 1fr;
        gap: 1rem;
        padding: 1rem;
    }
    
    .stat-number {
        font-size: 1.75rem;
        color: var(--primary-color) !important;
        font-weight: var(--font-weight-black) !important;
    }
    
    .stat-label {
        color: var(--text-secondary) !important;
        font-weight: var(--font-weight-medium) !important;
    }
    
    /* Sections */
    .features,
    .how-it-works,
    .success-stories,
    .about,
    .cta {
        padding: 2rem 0;
    }
    
    .section-title {
        font-size: var(--mobile-h2);
        margin-bottom: 1rem;
        color: var(--text-primary) !important;
        font-weight: var(--font-weight-bold) !important;
    }
    
    .section-subtitle {
        font-size: var(--mobile-body);
        margin-bottom: 1.5rem;
        color: var(--text-secondary) !important;
        font-weight: var(--font-weight-normal) !important;
    }
    
    /* Features */
    .feature-card {
        padding: 1.25rem;
        text-align: center;
    }
    
    .feature-icon {
        width: 50px;
        height: 50px;
        margin: 0 auto 1rem;
    }
    
    .feature-card h3 {
        font-size: var(--mobile-h3);
        color: var(--text-primary) !important;
        font-weight: var(--font-weight-semibold) !important;
    }
    
    .feature-card p {
        color: var(--text-secondary) !important;
        font-weight: var(--font-weight-normal) !important;
    }
    
    .feature-list li {
        color: var(--text-tertiary) !important;
        font-weight: var(--font-weight-normal) !important;
    }
    
    /* Process */
    .process-tabs {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .tab-button {
        width: 100%;
        text-align: center;
    }
    
    .step {
        grid-template-columns: auto 1fr;
        gap: 1rem;
        margin-bottom: 2rem;
    }
    
    .step-number {
        width: 50px;
        height: 50px;
        font-size: 1.125rem;
    }
    
    .step:not(:last-child)::after {
        left: 20px;
        height: 30px;
    }
    
    .step-content h3 {
        font-size: var(--mobile-h3);
        color: var(--text-primary) !important;
        font-weight: var(--font-weight-semibold) !important;
    }
    
    .step-content p {
        color: var(--text-secondary) !important;
        font-weight: var(--font-weight-normal) !important;
    }
    
    /* Success Stories */
    .story-header {
        flex-direction: column;
        text-align: center;
        gap: 0.75rem;
    }
    
    .story-avatar {
        width: 50px;
        height: 50px;
        font-size: 1.25rem;
    }
    
    .story-info h4 {
        color: var(--text-primary) !important;
        font-weight: var(--font-weight-semibold) !important;
    }
    
    .story-info p {
        color: var(--text-tertiary) !important;
        font-weight: var(--font-weight-normal) !important;
    }
    
    .story-text {
        color: var(--text-secondary) !important;
        font-weight: var(--font-weight-normal) !important;
    }
    
    .story-match {
        flex-direction: column;
        gap: 0.5rem;
        text-align: center;
    }
    
    .company {
        color: var(--text-tertiary) !important;
        font-weight: var(--font-weight-normal) !important;
    }
    
    /* About */
    .about-feature {
        flex-direction: column;
        text-align: center;
        gap: 0.75rem;
    }
    
    .about-feature i {
        font-size: 2rem;
    }
    
    .about-feature h4 {
        color: var(--text-primary) !important;
        font-weight: var(--font-weight-semibold) !important;
    }
    
    .about-feature p {
        color: var(--text-secondary) !important;
        font-weight: var(--font-weight-normal) !important;
    }
    
    .about-description {
        color: var(--text-secondary) !important;
        font-weight: var(--font-weight-normal) !important;
    }
    
    /* CTA */
    .cta-title {
        font-size: var(--mobile-h2);
        color: var(--text-white) !important;
        font-weight: var(--font-weight-bold) !important;
    }
    
    .cta-description {
        font-size: var(--mobile-body);
        color: var(--text-white) !important;
        font-weight: var(--font-weight-normal) !important;
    }
    
    .cta-buttons {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    .btn-primary.large,
    .btn-secondary.large {
        padding: 16px 24px;
        font-size: 1rem;
        color: var(--text-white) !important;
        font-weight: var(--font-weight-semibold) !important;
    }
    
    .cta-note {
        color: var(--text-white) !important;
        font-weight: var(--font-weight-normal) !important;
    }
    
    /* Footer */
    .footer {
        padding: 2rem 0 1rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 1.5rem;
    }
    
    .footer-logo {
        color: var(--text-white) !important;
        font-weight: var(--font-weight-bold) !important;
    }
    
    .footer-description {
        color: #A0AEC0 !important;
        font-weight: var(--font-weight-normal) !important;
    }
    
    .footer-section h4 {
        margin-bottom: 1rem;
        color: var(--text-white) !important;
        font-weight: var(--font-weight-semibold) !important;
    }
    
    .footer-links li {
        margin-bottom: 0.5rem;
    }
    
    .footer-links a {
        color: #A0AEC0 !important;
        font-weight: var(--font-weight-normal) !important;
    }
    
    .footer-bottom-content {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .footer-badge {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .badge {
        color: var(--text-white) !important;
        font-weight: var(--font-weight-medium) !important;
    }
    
    /* Dashboard */
    .dashboard-header {
        height: auto;
        min-height: 60px;
        padding: 1rem 0.75rem;
        flex-direction: column;
        gap: 1rem;
    }
    
    .dashboard-title {
        font-size: var(--mobile-h3);
        color: var(--text-primary) !important;
        font-weight: var(--font-weight-semibold) !important;
    }
    
    .dashboard-content {
        padding: 0.75rem;
    }
    
    .dashboard-grid {
        gap: 1rem;
    }
    
    
}