/* ================================
   ANIMATIONS & INTERACTIVE EFFECTS
   ================================ */

/* ================================
   ANIMATED UNDERLINE EFFECT
   ================================ */

.animated-underline {
    position: relative;
    display: inline-block;
}

.animated-underline::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -4px;
    width: 0;
    height: 2px;
    background-color: var(--color-accent);
    transition: width var(--transition-speed) var(--transition-easing);
}

.animated-underline:hover::after,
.article-link:hover .animated-underline::after,
.article-card:hover .animated-underline::after {
    width: 100%;
}

/* Left to right draw animation */
.animated-underline span {
    position: relative;
    display: inline-block;
}

/* ================================
   HOVER EFFECTS
   ================================ */

/* Link hover effect */
a {
    transition: all var(--transition-speed) var(--transition-easing);
}

/* Image hover effect */
.article-image {
    position: relative;
    overflow: hidden;
}

.article-image::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to bottom, transparent 0%, rgba(0, 0, 0, 0.1) 100%);
    opacity: 0;
    transition: opacity var(--transition-speed) var(--transition-easing);
}

.featured-article:hover .article-image::after {
    opacity: 1;
}

/* Card lift effect */
.article-card,
.featured-article {
    transition: transform var(--transition-speed) var(--transition-easing),
                box-shadow var(--transition-speed) var(--transition-easing);
}

/* ================================
   FADE IN ANIMATIONS
   ================================ */

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* ================================
   SCALE ANIMATIONS
   ================================ */

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* ================================
   BUTTON ANIMATIONS
   ================================ */

.theme-toggle,
.lang-toggle,
.scroll-top {
    position: relative;
    overflow: hidden;
}

.theme-toggle::before,
.lang-toggle::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background-color: rgba(0, 0, 0, 0.05);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.theme-toggle:active::before,
.lang-toggle:active::before {
    width: 300px;
    height: 300px;
}

/* Button bounce effect */
@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-10px);
    }
    60% {
        transform: translateY(-5px);
    }
}

.scroll-top:hover {
    animation: bounce 1s;
}

/* ================================
   MARQUEE ANIMATION
   ================================ */

.marquee {
    animation: marquee 30s linear infinite;
}

@keyframes marquee {
    0% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(-50%);
    }
}

/* Pause on hover */
.marquee-container:hover .marquee {
    animation-play-state: paused;
}

/* ================================
   LOADING ANIMATION
   ================================ */

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.loading {
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* ================================
   SHIMMER EFFECT (for loading states)
   ================================ */

@keyframes shimmer {
    0% {
        background-position: -1000px 0;
    }
    100% {
        background-position: 1000px 0;
    }
}

.shimmer {
    background: linear-gradient(
        to right,
        var(--color-bg) 0%,
        var(--color-bg-secondary) 20%,
        var(--color-bg) 40%,
        var(--color-bg) 100%
    );
    background-size: 1000px 100%;
    animation: shimmer 2s infinite;
}

/* ================================
   PAGE TRANSITION
   ================================ */

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

body {
    animation: pageEnter 0.6s var(--transition-easing);
}

/* ================================
   STAGGER ANIMATION (for lists)
   ================================ */

.stagger-animation {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s var(--transition-easing);
}

.stagger-animation.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger delay classes */
.stagger-delay-1 { transition-delay: 100ms; }
.stagger-delay-2 { transition-delay: 200ms; }
.stagger-delay-3 { transition-delay: 300ms; }
.stagger-delay-4 { transition-delay: 400ms; }
.stagger-delay-5 { transition-delay: 500ms; }
.stagger-delay-6 { transition-delay: 600ms; }

/* ================================
   FOCUS ANIMATIONS
   ================================ */

button:focus-visible,
a:focus-visible,
input:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 4px;
    transition: outline-offset 0.2s;
}

/* ================================
   REDUCED MOTION
   ================================ */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    .marquee {
        animation: none;
    }

    .scroll-top:hover {
        animation: none;
    }
}

/* ================================
   HOVER GLOW EFFECT
   ================================ */

.glow-on-hover {
    position: relative;
    transition: all var(--transition-speed);
}

.glow-on-hover::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    border-radius: inherit;
    opacity: 0;
    background: linear-gradient(45deg, var(--color-accent), var(--color-accent-dark));
    z-index: -1;
    transition: opacity var(--transition-speed);
    filter: blur(10px);
}

.glow-on-hover:hover::before {
    opacity: 0.3;
}

/* ================================
   UTILITY ANIMATION CLASSES
   ================================ */

.animate-fade-in {
    animation: fadeIn 0.6s var(--transition-easing);
}

.animate-fade-in-down {
    animation: fadeInDown 0.6s var(--transition-easing);
}

.animate-fade-in-up {
    animation: fadeInUp 0.6s var(--transition-easing);
}

.animate-fade-in-left {
    animation: fadeInLeft 0.6s var(--transition-easing);
}

.animate-fade-in-right {
    animation: fadeInRight 0.6s var(--transition-easing);
}

.animate-scale-in {
    animation: scaleIn 0.6s var(--transition-easing);
}