/* ================================================
   ANIMATIONS - Physics LMS
   ================================================ */

/* Keyframes */
@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(60px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-60px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideOutRight {
    from {
        opacity: 1;
        transform: translateX(0);
    }

    to {
        opacity: 0;
        transform: translateX(60px);
    }
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

@keyframes orbPulse {

    0%,
    100% {
        transform: scale(1);
        box-shadow: 0 0 30px var(--accent-glow);
    }

    50% {
        transform: scale(1.1);
        box-shadow: 0 0 60px var(--accent-glow), 0 0 100px var(--cyan-glow);
    }
}

@keyframes shimmer {
    to {
        background-position: -200% 0;
    }
}

@keyframes countUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Swing Bar Animation */
@keyframes swingBarRise {
    0% {
        height: 0;
        opacity: 0;
    }

    60% {
        opacity: 1;
    }

    80% {
        height: calc(var(--bar-height) + 10px);
    }

    100% {
        height: var(--bar-height);
        opacity: 1;
    }
}

@keyframes crownBounce {
    0% {
        transform: translateY(-20px) scale(0);
        opacity: 0;
    }

    50% {
        transform: translateY(5px) scale(1.1);
        opacity: 1;
    }

    100% {
        transform: translateY(0) scale(1);
        opacity: 1;
    }
}

@keyframes podiumShine {
    0% {
        background-position: -200% center;
    }

    100% {
        background-position: 200% center;
    }
}

/* Swing Bar Component */
.swing-bar-container {
    display: flex;
    align-items: flex-end;
    justify-content: center;
    gap: var(--space-6);
    padding: var(--space-8) var(--space-4);
    min-height: 350px;
    position: relative;
}

.swing-bar-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 140px;
}

.swing-bar-avatar {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: var(--space-2);
    border: 3px solid var(--glass-border);
    animation: fadeInDown 0.6s ease forwards;
    animation-delay: var(--delay, 0.5s);
    opacity: 0;
}

.swing-bar-name {
    font-size: var(--fs-sm);
    font-weight: var(--fw-semibold);
    color: var(--white);
    text-align: center;
    margin-bottom: var(--space-2);
    animation: fadeIn 0.5s ease forwards;
    animation-delay: var(--delay, 0.5s);
    opacity: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 140px;
}

.swing-bar-rank {
    font-size: var(--fs-xs);
    color: var(--neutral-400);
    margin-bottom: var(--space-3);
    animation: fadeIn 0.5s ease forwards;
    animation-delay: var(--delay, 0.5s);
    opacity: 0;
}

.swing-bar-bar {
    width: 80px;
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    animation: swingBarRise 0.8s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
    animation-delay: var(--delay, 0s);
    height: 0;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: var(--space-3);
    font-family: var(--font-heading);
    font-size: var(--fs-2xl);
    font-weight: var(--fw-extrabold);
    color: rgba(255, 255, 255, 0.9);
    position: relative;
    overflow: hidden;
}

.swing-bar-bar::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    background-size: 200% 100%;
    animation: podiumShine 3s ease-in-out infinite;
    animation-delay: 1s;
}

.swing-bar-item.gold .swing-bar-bar {
    background: var(--gradient-gold);
    --bar-height: 180px;
}

.swing-bar-item.gold .swing-bar-avatar {
    border-color: var(--gold);
    box-shadow: 0 0 20px var(--gold-glow);
}

.swing-bar-item.silver .swing-bar-bar {
    background: var(--gradient-silver);
    --bar-height: 140px;
}

.swing-bar-item.silver .swing-bar-avatar {
    border-color: var(--silver);
}

.swing-bar-item.bronze .swing-bar-bar {
    background: var(--gradient-bronze);
    --bar-height: 110px;
}

.swing-bar-item.bronze .swing-bar-avatar {
    border-color: var(--bronze);
}

.swing-bar-crown {
    position: absolute;
    top: -30px;
    font-size: 1.8rem;
    animation: crownBounce 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
    animation-delay: 1s;
    opacity: 0;
}

.swing-bar-marks {
    font-size: var(--fs-xs);
    color: var(--neutral-400);
    margin-top: var(--space-1);
    animation: fadeIn 0.5s ease forwards;
    animation-delay: var(--delay, 0.5s);
    opacity: 0;
}

/* Page-specific animations */
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-8);
    flex-wrap: wrap;
    gap: var(--space-4);
}

.page-header h1 {
    font-size: var(--fs-2xl);
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.page-header-subtitle {
    color: var(--neutral-400);
    font-size: var(--fs-sm);
    margin-top: var(--space-1);
}

/* Login page specific */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-900);
    position: relative;
    overflow: hidden;
}

.login-bg-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.3;
    animation: orbFloat 8s ease-in-out infinite;
}

.login-bg-orb-1 {
    width: 400px;
    height: 400px;
    background: var(--accent-500);
    top: -100px;
    right: -100px;
}

.login-bg-orb-2 {
    width: 300px;
    height: 300px;
    background: var(--cyan-500);
    bottom: -80px;
    left: -80px;
    animation-delay: 2s;
}

@keyframes orbFloat {

    0%,
    100% {
        transform: translate(0, 0);
    }

    50% {
        transform: translate(30px, -30px);
    }
}

.login-card {
    background: rgba(20, 20, 40, 0.8);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: var(--space-10);
    width: 420px;
    max-width: 95vw;
    backdrop-filter: blur(30px);
    box-shadow: var(--shadow-xl);
    animation: scaleIn 0.5s ease;
    position: relative;
    z-index: 1;
}

.login-logo {
    width: 64px;
    height: 64px;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    margin: 0 auto var(--space-6);
    box-shadow: var(--shadow-glow);
}

.login-card h1 {
    text-align: center;
    font-size: var(--fs-2xl);
    margin-bottom: var(--space-1);
}

.login-card .login-sub {
    text-align: center;
    color: var(--neutral-400);
    font-size: var(--fs-sm);
    margin-bottom: var(--space-8);
}

/* Batch Select */
.batch-select-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: var(--space-8);
    background: var(--primary-900);
}

.batch-cards {
    display: flex;
    gap: var(--space-6);
    flex-wrap: wrap;
    justify-content: center;
}

.batch-card {
    width: 200px;
    height: 200px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
    background: var(--glass-bg);
    border: 2px solid var(--glass-border);
    border-radius: var(--radius-xl);
    cursor: pointer;
    transition: all var(--transition-base);
    backdrop-filter: blur(20px);
}

.batch-card:hover {
    border-color: var(--accent-400);
    transform: translateY(-8px);
    box-shadow: var(--shadow-glow);
}

.batch-card .batch-year {
    font-family: var(--font-heading);
    font-size: var(--fs-3xl);
    font-weight: var(--fw-extrabold);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.batch-card .batch-label {
    color: var(--neutral-400);
    font-size: var(--fs-sm);
}

/* Q&A thread */
.qa-thread {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.qa-message {
    max-width: 75%;
    padding: var(--space-4);
    border-radius: var(--radius-lg);
    font-size: var(--fs-sm);
}

.qa-message.student {
    align-self: flex-start;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
}

.qa-message.teacher {
    align-self: flex-end;
    background: rgba(108, 99, 255, 0.15);
    border: 1px solid rgba(108, 99, 255, 0.2);
}

.qa-message-meta {
    font-size: var(--fs-xs);
    color: var(--neutral-500);
    margin-top: var(--space-2);
}

.qa-message img {
    max-width: 300px;
    border-radius: var(--radius-md);
    margin-top: var(--space-2);
}

/* Homework card */
.homework-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--space-5);
    display: flex;
    align-items: center;
    gap: var(--space-4);
    transition: all var(--transition-fast);
}

.homework-card:hover {
    border-color: rgba(108, 99, 255, 0.2);
}

.homework-status-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.homework-status-icon.done {
    background: var(--success-bg);
    color: var(--success-400);
}

.homework-status-icon.pending {
    background: var(--warning-bg);
    color: var(--warning-400);
}

/* Reminder banner */
.reminder-banner {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.1), rgba(245, 158, 11, 0.05));
    border: 1px solid rgba(245, 158, 11, 0.2);
    border-radius: var(--radius-lg);
    padding: var(--space-4) var(--space-6);
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-6);
}

.reminder-banner-icon {
    font-size: 1.4rem;
}

.reminder-banner-text {
    font-size: var(--fs-sm);
    color: var(--warning-400);
}

/* Video card */
.video-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-base);
    cursor: pointer;
}

.video-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-glow);
}

.video-card-thumb {
    width: 100%;
    aspect-ratio: 16/9;
    background: var(--neutral-700);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    color: var(--neutral-400);
    position: relative;
}

.video-card-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.video-card-play {
    position: absolute;
    width: 56px;
    height: 56px;
    background: rgba(108, 99, 255, 0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    color: white;
    box-shadow: 0 4px 20px var(--accent-glow);
    transition: transform var(--transition-fast);
}

.video-card:hover .video-card-play {
    transform: scale(1.1);
}

.video-card-info {
    padding: var(--space-4);
}

.video-card-title {
    font-weight: var(--fw-semibold);
    font-size: var(--fs-base);
}

.video-card-desc {
    font-size: var(--fs-xs);
    color: var(--neutral-400);
    margin-top: var(--space-1);
}

/* Article card */
.article-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    transition: all var(--transition-base);
    cursor: pointer;
}

.article-card:hover {
    transform: translateY(-2px);
    border-color: rgba(108, 99, 255, 0.2);
}

.article-card-title {
    font-size: var(--fs-lg);
    font-weight: var(--fw-semibold);
    margin-bottom: var(--space-2);
}

.article-card-excerpt {
    font-size: var(--fs-sm);
    color: var(--neutral-400);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-card-meta {
    margin-top: var(--space-3);
    font-size: var(--fs-xs);
    color: var(--neutral-500);
}

/* Registration pending screen */
.pending-screen {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: var(--primary-900);
}

.pending-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: var(--space-10);
    max-width: 450px;
    backdrop-filter: blur(30px);
}

.pending-icon {
    font-size: 4rem;
    margin-bottom: var(--space-6);
    animation: orbPulse 2s infinite;
    display: inline-block;
}

/* Filter bar */
.filter-bar {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    flex-wrap: wrap;
    padding: var(--space-4) var(--space-6);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-6);
}

.filter-bar .form-select {
    min-width: 160px;
}

.filter-bar label {
    font-size: var(--fs-xs);
    color: var(--neutral-400);
    font-weight: var(--fw-medium);
}