/**
 * Mobile Touch & Interaction Fixes
 * Ensures all elements are tappable and responsive
 */

/* ===================================
   Touch Target Enhancements
   =================================== */

/* Minimum 44x44px touch targets on all devices */
@media (max-width: 900px) {
    button,
    a,
    .btn,
    .nav-link,
    input[type="button"],
    input[type="submit"],
    .mobile-menu-btn,
    .hamburger-menu,
    [role="button"],
    .clickable {
        min-height: 44px;
        min-width: 44px;
        padding: 12px 20px;
        position: relative;
        -webkit-tap-highlight-color: rgba(99, 102, 241, 0.2);
        cursor: pointer;
    }

    /* Larger touch area for small buttons */
    button::before,
    .btn::before,
    .nav-link::before {
        content: '';
        position: absolute;
        top: -8px;
        left: -8px;
        right: -8px;
        bottom: -8px;
        z-index: -1;
    }
}

/* Landscape mode adjustments */
@media (max-width: 900px) and (orientation: landscape) {
    button,
    a,
    .btn,
    .nav-link {
        min-height: 38px;
        padding: 10px 18px;
    }
}

/* ===================================
   Touch Active States
   =================================== */

.touch-active {
    opacity: 0.7 !important;
    transform: scale(0.98) !important;
    transition: all 0.1s ease !important;
}

/* Prevent text selection during touch */
@media (max-width: 900px) {
    button,
    .btn,
    .nav-link,
    .mobile-menu-btn {
        -webkit-user-select: none;
        -moz-user-select: none;
        -ms-user-select: none;
        user-select: none;
        -webkit-touch-callout: none;
    }
}

/* ===================================
   Mobile Menu Button Enhancement
   =================================== */

@media (max-width: 768px) {
    .mobile-menu-btn,
    #mobileMenuBtn {
        position: relative;
        z-index: 1002;
        width: 48px;
        height: 48px;
        padding: 12px;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 6px;
        background: transparent;
        border: none;
        cursor: pointer;
        -webkit-tap-highlight-color: rgba(99, 102, 241, 0.3);
    }

    .mobile-menu-btn span,
    #mobileMenuBtn span {
        display: block;
        width: 24px;
        height: 3px;
        background: var(--text-primary);
        border-radius: 2px;
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        transform-origin: center;
    }

    .mobile-menu-btn.active span:nth-child(1),
    #mobileMenuBtn.active span:nth-child(1) {
        transform: translateY(9px) rotate(45deg);
    }

    .mobile-menu-btn.active span:nth-child(2),
    #mobileMenuBtn.active span:nth-child(2) {
        opacity: 0;
        transform: translateX(-20px);
    }

    .mobile-menu-btn.active span:nth-child(3),
    #mobileMenuBtn.active span:nth-child(3) {
        transform: translateY(-9px) rotate(-45deg);
    }
}

/* ===================================
   Prevent Scroll Jump
   =================================== */

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
    overflow-anchor: none; /* Disable scroll anchoring */
}

body {
    overflow-x: hidden;
    overflow-anchor: none;
    position: relative;
}

/* Disable scroll anchoring on all elements */
* {
    overflow-anchor: none !important;
}

/* ===================================
   Button Visibility & Clickability
   =================================== */

@media (max-width: 900px) {
    /* Ensure all buttons are visible and clickable */
    .btn,
    button,
    a.btn {
        display: inline-flex !important;
        align-items: center;
        justify-content: center;
        pointer-events: auto !important;
        touch-action: manipulation;
        min-height: 44px;
        position: relative;
        z-index: 10;
    }

    /* Hero buttons */
    .hero-buttons .btn {
        width: 100%;
        padding: 16px 24px;
        font-size: 16px;
        font-weight: 600;
    }

    /* Navigation buttons */
    .nav-links .btn {
        width: 100%;
        margin: 8px 0;
        justify-content: center;
    }

    /* Card action buttons */
    .feature-card,
    .why-card,
    .academic-card,
    .contact-card,
    .creator-link {
        pointer-events: auto !important;
        touch-action: manipulation;
        cursor: pointer;
    }
}

/* ===================================
   Link Enhancement
   =================================== */

@media (max-width: 900px) {
    a {
        touch-action: manipulation;
        -webkit-tap-highlight-color: rgba(99, 102, 241, 0.2);
    }

    /* Nav links in mobile menu */
    .nav-links a {
        display: block;
        width: 100%;
        padding: 16px 20px;
        min-height: 52px;
        margin: 4px 0;
        border-radius: 12px;
        transition: all 0.3s ease;
    }

    .nav-links a:active {
        background: rgba(99, 102, 241, 0.15);
        transform: scale(0.98);
    }
}

/* ===================================
   Mobile Overlay Enhancement
   =================================== */

.mobile-nav-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 999;
    opacity: 0;
    transition: opacity 0.3s ease;
    touch-action: none;
}

.mobile-nav-overlay.active {
    display: block;
    opacity: 1;
}

/* ===================================
   Landscape Mode Specific Fixes
   =================================== */

@media (max-width: 900px) and (orientation: landscape) {
    /* Reduce heights in landscape for better usability */
    .navbar {
        padding: 8px 16px;
    }

    .mobile-menu-btn,
    #mobileMenuBtn {
        width: 40px;
        height: 40px;
        padding: 10px;
    }

    .nav-links {
        padding: 3rem 1.5rem 1.5rem;
    }

    .nav-links a {
        padding: 12px 16px;
        min-height: 44px;
    }

    .hero-section {
        min-height: auto;
        padding: 80px 0 40px;
    }

    /* Buttons smaller in landscape */
    .btn {
        min-height: 38px;
        padding: 10px 18px;
    }
}

/* ===================================
   Scroll Performance
   =================================== */

@media (max-width: 900px) {
    /* Use GPU acceleration for smoother scrolling */
    .hero-section,
    .features-section,
    .about-section,
    .academics-section,
    .contact-section {
        will-change: auto;
        transform: translateZ(0);
        -webkit-transform: translateZ(0);
    }

    /* Smooth momentum scrolling on iOS */
    body,
    .nav-links {
        -webkit-overflow-scrolling: touch;
    }
}

/* ===================================
   Input & Form Elements
   =================================== */

@media (max-width: 900px) {
    /* Prevent zoom on input focus (iOS) */
    input[type="text"],
    input[type="email"],
    input[type="password"],
    input[type="number"],
    input[type="tel"],
    input[type="search"],
    select,
    textarea {
        font-size: 16px !important;
        min-height: 44px;
        padding: 12px;
        touch-action: manipulation;
    }

    /* Better select dropdowns on mobile */
    select {
        -webkit-appearance: none;
        -moz-appearance: none;
        appearance: none;
        background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
        background-repeat: no-repeat;
        background-position: right 12px center;
        background-size: 16px;
        padding-right: 40px;
    }
}

/* ===================================
   Creator Section Enhancement
   =================================== */

@media (max-width: 900px) {
    .creator-link {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 100%;
        min-height: 52px;
        padding: 14px 24px;
        gap: 12px;
        touch-action: manipulation;
        -webkit-tap-highlight-color: rgba(99, 102, 241, 0.2);
    }

    .back-to-top-btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        min-height: 52px;
        padding: 14px 28px;
        gap: 8px;
        width: 100%;
        max-width: 300px;
        touch-action: manipulation;
    }
}

/* ===================================
   Debug Helper (add ?debug to URL)
   =================================== */

body.debug-mode * {
    outline: 1px solid rgba(255, 0, 0, 0.2) !important;
}

body.debug-mode button,
body.debug-mode a,
body.debug-mode .btn {
    outline: 2px solid rgba(0, 255, 0, 0.5) !important;
}

/* ===================================
   iOS Specific Fixes
   =================================== */

@supports (-webkit-touch-callout: none) {
    /* iOS Safari specific */
    @media (max-width: 900px) {
        button,
        .btn,
        a {
            cursor: pointer;
            -webkit-tap-highlight-color: rgba(99, 102, 241, 0.2);
            -webkit-touch-callout: none;
        }

        /* Fix for iOS rubber band effect */
        body {
            overscroll-behavior-y: none;
        }

        /* Fix for iOS momentum scrolling */
        .nav-links {
            -webkit-overflow-scrolling: touch;
            overflow-y: auto;
        }
    }
}

/* ===================================
   Android Specific Fixes
   =================================== */

@supports not (-webkit-touch-callout: none) {
    /* Android Chrome specific */
    @media (max-width: 900px) {
        button,
        .btn,
        a {
            -webkit-tap-highlight-color: rgba(99, 102, 241, 0.2);
        }
    }
}

/* ===================================
   Accessibility
   =================================== */

@media (max-width: 900px) {
    /* Focus states for keyboard navigation */
    button:focus-visible,
    a:focus-visible,
    .btn:focus-visible {
        outline: 3px solid var(--primary);
        outline-offset: 2px;
    }

    /* Reduce motion if preferred */
    @media (prefers-reduced-motion: reduce) {
        * {
            animation-duration: 0.01ms !important;
            animation-iteration-count: 1 !important;
            transition-duration: 0.01ms !important;
            scroll-behavior: auto !important;
        }
    }
}

/* ===================================
   Safe Area Insets (iPhone Notch)
   =================================== */

@supports (padding: env(safe-area-inset-bottom)) {
    @media (max-width: 900px) {
        body {
            padding-bottom: env(safe-area-inset-bottom);
        }

        .navbar {
            padding-left: max(1rem, env(safe-area-inset-left));
            padding-right: max(1rem, env(safe-area-inset-right));
        }

        .footer {
            padding-bottom: calc(2rem + env(safe-area-inset-bottom));
        }
    }
}