/**
 * Abdur Rehman Portfolio - Component Library
 * Core styling for Button assets, Glassmorphic project cards, dynamic form elements,
 * custom scroll-up indicators, hamburger toggles, and tech badges.
 */

/* ==========================================================================
   1. Buttons & Action Links
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-xl);
    font-family: var(--font-heading);
    font-size: var(--fs-sm);
    font-weight: var(--fw-semibold);
    border-radius: var(--border-radius-full);
    transition: 
        background var(--transition-normal),
        color var(--transition-normal),
        border-color var(--transition-normal),
        box-shadow var(--transition-normal),
        transform var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.btn--primary {
    background: var(--gradient-primary);
    color: var(--color-bg);
    box-shadow: var(--glow-cyan);
}

.btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--glow-cyan-strong);
}

.btn--secondary {
    background: rgba(30, 41, 66, 0.4);
    color: var(--color-text-primary);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(4px);
}

.btn--secondary:hover {
    background: rgba(30, 41, 66, 0.8);
    border-color: rgba(var(--color-accent-rgb), 0.4);
    transform: translateY(-2px);
}

.btn--accent {
    background: transparent;
    color: var(--color-accent);
    border: 1px solid rgba(var(--color-accent-rgb), 0.3);
}

.btn--accent:hover {
    background: rgba(var(--color-accent-rgb), 0.05);
    border-color: var(--color-accent);
    transform: translateY(-2px);
    box-shadow: var(--glow-cyan);
}

/* Iconic link modifiers */
.btn-icon {
    font-size: var(--fs-md);
    transition: transform var(--transition-fast);
}

.btn:hover .btn-icon {
    transform: translateX(3px);
}

/* ==========================================================================
   2. Glassmorphic Interactive Cards
   ========================================================================== */
.card {
    background: rgba(19, 27, 46, 0.45);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: var(--space-lg);
    transition: 
        transform var(--transition-spring),
        border-color var(--transition-normal),
        box-shadow var(--transition-normal);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.card:hover {
    transform: translateY(-5px);
    border-color: rgba(var(--color-accent-rgb), 0.25);
    box-shadow: 
        0 10px 30px -15px rgba(0, 0, 0, 0.5),
        0 0 20px rgba(var(--color-accent-rgb), 0.05);
}

/* Interactive Border Glow Card */
.card-glow::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-glow);
    opacity: 0;
    transition: opacity var(--transition-normal);
    pointer-events: none;
    z-index: 1;
}

.card-glow:hover::before {
    opacity: 1;
}

/* Project Card Structure */
.project-card {
    display: flex;
    flex-direction: column;
    height: 100%;
    padding: 0; /* Override padding for image wrapper */
    transition: 
        transform var(--transition-spring),
        opacity var(--transition-normal),
        border-color var(--transition-normal),
        box-shadow var(--transition-normal);
}

.project-card--hidden {
    opacity: 0;
    transform: scale(0.85) translateY(10px);
    position: absolute;
    pointer-events: none;
    visibility: hidden;
    width: 0;
    height: 0;
    overflow: hidden;
    padding: 0 !important;
    border: none !important;
    margin: 0 !important;
}

.project-card__img-container {
    width: 100%;
    aspect-ratio: 16/9;
    position: relative;
    overflow: hidden;
    border-bottom: 1px solid var(--border-color);
    border-top-left-radius: var(--border-radius-md);
    border-top-right-radius: var(--border-radius-md);
}

.project-card__img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.card:hover .project-card__img {
    transform: scale(1.05);
}

.project-card__content {
    padding: var(--space-lg);
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.project-card__title {
    font-size: var(--fs-lg);
    margin-bottom: var(--space-xs);
    transition: color var(--transition-fast);
}

.card:hover .project-card__title {
    color: var(--color-accent);
}

.project-card__desc {
    font-size: var(--fs-sm);
    color: var(--color-text-secondary);
    line-height: 1.5;
    margin-bottom: var(--space-lg);
    flex-grow: 1;
}

.project-card__footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: auto;
}

/* ==========================================================================
   3. Badges, Tags & Categories
   ========================================================================== */
.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--space-2xs) var(--space-sm);
    font-size: var(--fs-xs);
    font-weight: var(--fw-semibold);
    border-radius: var(--border-radius-full);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.badge--data {
    background-color: rgba(37, 99, 235, 0.1);
    color: #60A5FA;
    border: 1px solid rgba(37, 99, 235, 0.2);
}

.badge--web {
    background-color: rgba(6, 182, 212, 0.1);
    color: #22D3EE;
    border: 1px solid rgba(6, 182, 212, 0.2);
}

.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-bottom: var(--space-md);
}

.tag {
    font-size: var(--fs-xs);
    color: var(--color-text-muted);
    background: rgba(30, 41, 59, 0.3);
    padding: 2px var(--space-xs);
    border-radius: var(--border-radius-sm);
    border: 1px solid rgba(255, 255, 255, 0.03);
}

/* ==========================================================================
   4. Form Input Fields (Floating Labels)
   ========================================================================== */
.form-group {
    position: relative;
    margin-bottom: var(--space-lg);
}

.form-input,
.form-textarea {
    width: 100%;
    padding: var(--space-md) var(--space-lg);
    background: rgba(15, 23, 42, 0.4);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    color: var(--color-text-primary);
    font-size: var(--fs-sm);
    transition: 
        border-color var(--transition-fast),
        box-shadow var(--transition-fast);
    outline: none;
}

.form-textarea {
    min-height: 150px;
    resize: vertical;
}

.form-input:focus,
.form-textarea:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 10px rgba(6, 182, 212, 0.15);
}

.form-label {
    position: absolute;
    left: var(--space-lg);
    top: var(--space-md);
    color: var(--color-text-muted);
    font-size: var(--fs-sm);
    pointer-events: none;
    transition: 
        transform var(--transition-fast),
        font-size var(--transition-fast),
        color var(--transition-fast);
    transform-origin: left top;
}

/* Float logic for focus or populated values */
.form-input:focus ~ .form-label,
.form-input:not(:placeholder-shown) ~ .form-label,
.form-textarea:focus ~ .form-label,
.form-textarea:not(:placeholder-shown) ~ .form-label {
    transform: translateY(-24px) scale(0.85);
    color: var(--color-accent);
    font-weight: var(--fw-semibold);
}

/* ==========================================================================
   5. Interactive Mobile Hamburger Menu Trigger
   ========================================================================== */
.menu-toggle {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 18px;
    background: transparent;
    border: none;
    z-index: calc(var(--z-mobile-menu) + 5);
}

@media (min-width: 768px) {
    .menu-toggle {
        display: none;
    }
}

.menu-toggle__line {
    width: 100%;
    height: 2px;
    background-color: var(--color-text-primary);
    transition: 
        transform var(--transition-normal),
        opacity var(--transition-normal);
}

/* Mobile Nav Drawer Overlay */
.mobile-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 400px;
    height: 100vh;
    background-color: var(--color-bg-darker);
    border-left: 1px solid var(--border-color);
    z-index: var(--z-mobile-menu);
    padding: var(--space-4xl) var(--space-2xl) var(--space-2xl);
    display: flex;
    flex-direction: column;
    gap: var(--space-2xl);
    transition: right var(--transition-normal);
    box-shadow: var(--shadow-xl);
}

.mobile-nav--open {
    right: 0;
}

.mobile-nav__overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(6, 9, 18, 0.8);
    backdrop-filter: blur(4px);
    z-index: calc(var(--z-mobile-menu) - 1);
    opacity: 0;
    visibility: hidden;
    transition: 
        opacity var(--transition-normal),
        visibility var(--transition-normal);
}

.mobile-nav__overlay--active {
    opacity: 1;
    visibility: visible;
}

.mobile-nav__list {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.mobile-nav__link {
    font-family: var(--font-heading);
    font-size: var(--fs-lg);
    font-weight: var(--fw-semibold);
    color: var(--color-text-secondary);
}

.mobile-nav__link:hover,
.mobile-nav__link--active {
    color: var(--color-accent);
}

/* Hamburger active transform styling */
.menu-toggle--active .menu-toggle__line:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

.menu-toggle--active .menu-toggle__line:nth-child(2) {
    opacity: 0;
}

.menu-toggle--active .menu-toggle__line:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* ==========================================================================
   6. Back-to-Top circular scroll progress button
   ========================================================================== */
.back-to-top {
    position: fixed;
    bottom: var(--space-lg);
    right: var(--space-lg);
    width: 44px;
    height: 44px;
    border-radius: var(--border-radius-full);
    background-color: var(--color-surface);
    border: 1px solid var(--border-color);
    color: var(--color-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: var(--z-back-to-top);
    opacity: 0;
    visibility: hidden;
    transform: translateY(15px);
    transition: 
        opacity var(--transition-normal),
        visibility var(--transition-normal),
        transform var(--transition-normal),
        background var(--transition-fast),
        border-color var(--transition-fast);
    box-shadow: var(--shadow-lg);
}

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

.back-to-top:hover {
    background-color: var(--color-surface-hover);
    border-color: var(--color-accent);
    transform: translateY(-3px);
}

.back-to-top__svg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.back-to-top__circle {
    fill: none;
    stroke: var(--color-accent);
    stroke-width: 2.5;
    stroke-dasharray: 120; /* Circumference offset */
    stroke-dashoffset: 120;
    transition: stroke-dashoffset 0.1s linear;
}

/* ==========================================================================
   7. Loader Animation Layouts
   ========================================================================== */
.preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: var(--color-bg-darker);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: 
        opacity var(--transition-slow),
        visibility var(--transition-slow);
}

.preloader--hidden {
    opacity: 0;
    visibility: hidden;
}

.spinner {
    position: relative;
    width: 60px;
    height: 60px;
}

.spinner__ring {
    box-sizing: border-box;
    display: block;
    position: absolute;
    width: 50px;
    height: 50px;
    margin: 6px;
    border: 3px solid transparent;
    border-radius: 50%;
    animation: spinner-spin 1.2s cubic-bezier(0.5, 0, 0.5, 1) infinite;
    border-top-color: var(--color-accent);
}

.spinner__ring:nth-child(1) {
    animation-delay: -0.45s;
    border-top-color: var(--color-secondary);
}

.spinner__ring:nth-child(2) {
    animation-delay: -0.3s;
}

.spinner__ring:nth-child(3) {
    animation-delay: -0.15s;
}

@keyframes spinner-spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Section Header Typography Layout */
.section-header {
    margin-bottom: var(--space-2xl);
    max-width: 600px;
}

.section-header__subtitle {
    font-family: var(--font-heading);
    font-size: var(--fs-sm);
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: var(--fw-semibold);
    display: block;
    margin-bottom: var(--space-xs);
}

.section-header__title {
    font-size: var(--fs-2xl);
    font-weight: var(--fw-bold);
    margin-bottom: var(--space-sm);
    background: linear-gradient(135deg, var(--color-text-primary) 30%, var(--color-text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* ==========================================================================
   8. Stats Counter Grid Layout
   ========================================================================== */
.hero-stats {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-md);
    margin-top: var(--space-xl);
    border-top: 1px solid var(--border-color);
    padding-top: var(--space-lg);
}

@media (min-width: 480px) {
    .hero-stats {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--space-md);
        margin-top: var(--space-2xl);
        padding-top: var(--space-xl);
    }
}

.stat-item {
    display: flex;
    flex-direction: column;
    text-align: left;
}

.stat-item__num {
    font-family: var(--font-heading);
    font-size: var(--fs-xl);
    font-weight: var(--fw-bold);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1.1;
    margin-bottom: var(--space-2xs);
    filter: drop-shadow(var(--glow-cyan));
}

.stat-item__lbl {
    font-size: var(--fs-xs);
    color: var(--color-text-secondary);
    line-height: 1.3;
}

/* Service Card Detail Tweaks */
.service-icon-box {
    width: 60px;
    height: 60px;
    background-color: rgba(6, 182, 212, 0.05);
    border: 1px solid rgba(6, 182, 212, 0.1);
    border-radius: var(--border-radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-accent);
    font-size: var(--fs-lg);
    margin-bottom: var(--space-lg);
    transition: 
        background-color var(--transition-fast),
        border-color var(--transition-fast),
        color var(--transition-fast),
        transform var(--transition-normal);
}

.card:hover .service-icon-box {
    background-color: rgba(6, 182, 212, 0.15);
    border-color: var(--color-accent);
    color: var(--color-text-primary);
    transform: scale(1.05) rotate(5deg);
    box-shadow: var(--glow-cyan);
}

/* FAQ Accordion Styling */
.faq-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    margin-top: var(--space-xl);
}

.faq-item {
    background: rgba(19, 27, 46, 0.45);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    overflow: hidden;
    transition: border-color var(--transition-fast);
}

.faq-item[open] {
    border-color: rgba(var(--color-accent-rgb), 0.25);
}

.faq-question {
    padding: var(--space-lg);
    font-family: var(--font-heading);
    font-size: var(--fs-md);
    font-weight: var(--fw-semibold);
    color: var(--color-text-primary);
    cursor: pointer;
    list-style: none; /* Hide default summary arrow */
    display: flex;
    justify-content: space-between;
    align-items: center;
    outline: none;
    user-select: none;
}

.faq-question::-webkit-details-marker {
    display: none; /* Hide default summary arrow in Safari */
}

.faq-question__icon {
    transition: transform var(--transition-normal);
    color: var(--color-accent);
}

.faq-item[open] .faq-question__icon {
    transform: rotate(180deg);
}

.faq-answer {
    padding: 0 var(--space-lg) var(--space-lg);
    color: var(--color-text-secondary);
    font-size: var(--fs-sm);
    line-height: 1.6;
}

/* Availability Status Indicator */
.status-pill {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-xs) var(--space-md);
    background: rgba(34, 197, 94, 0.08);
    border: 1px solid rgba(34, 197, 94, 0.2);
    color: #4ADE80;
    border-radius: var(--border-radius-full);
    font-size: var(--fs-xs);
    font-weight: var(--fw-semibold);
}

.status-dot {
    width: 8px;
    height: 8px;
    background-color: #22C55E;
    border-radius: 50%;
    box-shadow: 0 0 8px #22C55E;
}