:root {
    --primary-color: #c96a3a;
    --primary-dark: #c96a3a;
    --primary-light: #c96a3a;
    --secondary-color: #c96a3a;
    --accent-color: #ffd9b3;
    --dark-color: #2c2c2c;
    --light-color: #ffffff;
    --gray-light: #f8f9fa;
    --gray-medium: #e9ecef;
    --gray-dark: #6c757d;
    --navbar-height: 60px;
    --categories-bar-height: 65px;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    padding-top: calc(var(--navbar-height) + var(--categories-bar-height));
    background: white;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    animation: fadeIn 0.6s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.navbar.fixed-top {
    position: fixed;
    top: 0;
    right: 0;
    left: 0;
    z-index: 1030;
    height: var(--navbar-height);
    background: white !important;
    box-shadow: var(--shadow-md);
    animation: slideDown 0.5s ease-out;
    border-bottom: 1px solid var(--accent-color);
}

.navbar.fixed-top .navbar-brand,
.navbar.fixed-top .nav-link {
    color: var(--primary-color) !important;
}

.navbar.fixed-top .nav-link:hover {
    color: var(--primary-dark) !important;
}

.navbar.fixed-top .navbar-toggler {
    border-color: var(--primary-color);
}

.navbar.fixed-top .navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(255, 107, 0, 1)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

.navbar.fixed-top .dropdown-menu {
    background: white;
    border: 1px solid var(--accent-color);
    box-shadow: var(--shadow-md);
}

.navbar.fixed-top .dropdown-item {
    color: var(--dark-color);
}

.navbar.fixed-top .dropdown-item:hover {
    background: #fff5eb;
    color: var(--primary-color);
}

@keyframes slideDown {
    from {
        transform: translateY(-100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.navbar-brand {
    font-weight: bold;
    font-size: 1.3rem;
    transition: transform var(--transition-fast);
}

.navbar-brand:hover {
    transform: scale(1.05);
}

.navbar-brand i {
    animation: bookShake 3s infinite;
}

@keyframes bookShake {
    0%,
    90%,
    100% {
        transform: rotate(0deg);
    }
    92% {
        transform: rotate(-5deg);
    }
    94% {
        transform: rotate(5deg);
    }
    96% {
        transform: rotate(-3deg);
    }
    98% {
        transform: rotate(3deg);
    }
}

.nav-link {
    position: relative;
    transition: all var(--transition-fast);
}

.nav-link::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: all var(--transition-medium);
    transform: translateX(-50%);
}

.nav-link:hover::after {
    width: 100%;
}

.categories-bar {
    position: fixed;
    top: var(--navbar-height);
    left: 0;
    right: 0;
    z-index: 1020;
    background: white;
    padding: 12px 0;
    box-shadow: var(--shadow-sm);
    border-bottom: 1px solid var(--accent-color);
    animation: slideDown 0.5s ease-out 0.1s both;
}

.categories-scroll {
    overflow-x: auto;
    overflow-y: hidden;
    white-space: nowrap;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    scrollbar-color: var(--primary-color) var(--accent-color);
    padding: 2px 0;
}

.categories-scroll::-webkit-scrollbar {
    height: 4px;
}

.categories-scroll::-webkit-scrollbar-track {
    background: var(--accent-color);
    border-radius: 10px;
}

.categories-scroll::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 10px;
}

.categories-scroll::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

.categories-wrapper {
    display: inline-flex;
    gap: 10px;
    padding: 2px 0;
}

.category-chip {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 18px;
    background: white;
    color: var(--dark-color);
    border-radius: 50px;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all var(--transition-medium);
    border: 1px solid var(--accent-color);
    white-space: nowrap;
    flex-shrink: 0;
    position: relative;
    overflow: hidden;
    animation: chipFadeIn 0.5s ease-out backwards;
}

.category-chip:nth-child(1) {
    animation-delay: 0.05s;
}
.category-chip:nth-child(2) {
    animation-delay: 0.1s;
}
.category-chip:nth-child(3) {
    animation-delay: 0.15s;
}
.category-chip:nth-child(4) {
    animation-delay: 0.2s;
}
.category-chip:nth-child(5) {
    animation-delay: 0.25s;
}
.category-chip:nth-child(6) {
    animation-delay: 0.3s;
}
.category-chip:nth-child(7) {
    animation-delay: 0.35s;
}
.category-chip:nth-child(8) {
    animation-delay: 0.4s;
}
.category-chip:nth-child(9) {
    animation-delay: 0.45s;
}

@keyframes chipFadeIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.category-chip::before {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: var(--primary-color);
    transform: translate(-50%, -50%);
    transition:
        width 0.6s,
        height 0.6s;
    z-index: -1;
    opacity: 0;
}

.category-chip:hover {
    color: var(--primary-dark);
    border-color: var(--primary-color);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.category-chip:hover::before {
    width: 300px;
    height: 300px;
    opacity: 0.05;
}

.category-chip i {
    font-size: 1rem;
    transition: transform var(--transition-fast);
}

.category-chip:hover i {
    transform: rotate(360deg);
}

.category-chip.active {
    background: linear-gradient(
        135deg,
        var(--primary-color) 0%,
        var(--primary-light) 100%
    );
    color: white;
    border-color: var(--primary-color);
    box-shadow: 0 4px 12px rgba(255, 107, 0, 0.25);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%,
    100% {
        box-shadow: 0 0 0 0 rgba(255, 107, 0, 0.4);
    }
    50% {
        box-shadow: 0 0 0 8px rgba(255, 107, 0, 0);
    }
}

.category-chip.active i {
    color: white;
    animation: iconSpin 0.5s ease-out;
}

@keyframes iconSpin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

.category-count {
    background: rgba(255, 255, 255, 0.3);
    border-radius: 12px;
    padding: 2px 8px;
    font-size: 0.75rem;
    font-weight: bold;
    transition: all var(--transition-fast);
}

.category-chip:hover .category-count {
    background: var(--primary-light);
    color: white;
}

.category-chip.active .category-count {
    background: rgba(255, 255, 255, 0.3);
    color: white;
}

.mobile-search-form {
    margin-right: 10px;
    flex: 1;
    max-width: 280px;
    animation: slideInRight 0.5s ease-out;
}

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

.mobile-search-form .input-group {
    border-radius: 30px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition-fast);
    border: 1px solid var(--accent-color);
}

.mobile-search-form .input-group:focus-within {
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.mobile-search-form .form-control {
    border: none;
    background: white;
    font-size: 0.9rem;
    padding: 8px 16px;
    transition: all var(--transition-fast);
}

.mobile-search-form .form-control:focus {
    background: white;
    box-shadow: none;
}

.mobile-search-form .btn {
    border: none;
    background: var(--primary-color);
    color: white;
    transition: all var(--transition-fast);
}

.mobile-search-form .btn:hover {
    background: var(--primary-dark);
    color: white;
}

.search-form-desktop {
    min-width: 320px;
    animation: slideInRight 0.5s ease-out 0.1s both;
}

.search-form-desktop .input-group {
    border-radius: 30px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition-fast);
    border: 1px solid var(--accent-color);
}

.search-form-desktop .input-group:focus-within {
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.search-form-desktop .form-control {
    border: none;
    padding: 10px 20px;
    background: white;
    transition: all var(--transition-fast);
}

.search-form-desktop .form-control:focus {
    background: white;
    box-shadow: none;
}

.search-form-desktop .btn {
    border: none;
    background: var(--primary-color);
    color: white;
    padding: 10px 20px;
    transition: all var(--transition-fast);
}

.search-form-desktop .btn:hover {
    background: var(--primary-dark);
    color: white;
}

.main-content {
    flex: 1;
    padding-top: 30px;
    padding-bottom: 50px;
    animation: fadeInUp 0.6s ease-out;
}

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

.document-card {
    transition: all var(--transition-medium);
    border: none;
    border-radius: 16px;
    overflow: hidden;
    height: 100%;
    background: white;
    box-shadow: var(--shadow-sm);
    position: relative;
    animation: cardAppear 0.6s ease-out backwards;
}

.document-card:nth-child(1) {
    animation-delay: 0.1s;
}
.document-card:nth-child(2) {
    animation-delay: 0.15s;
}
.document-card:nth-child(3) {
    animation-delay: 0.2s;
}
.document-card:nth-child(4) {
    animation-delay: 0.25s;
}
.document-card:nth-child(5) {
    animation-delay: 0.3s;
}
.document-card:nth-child(6) {
    animation-delay: 0.35s;
}

@keyframes cardAppear {
    from {
        opacity: 0;
        transform: scale(0.9) translateY(20px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.document-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(
        90deg,
        var(--primary-color) 0%,
        var(--primary-light) 100%
    );
    transform: scaleX(0);
    transition: transform var(--transition-medium);
    transform-origin: left;
}

.document-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.document-card:hover::before {
    transform: scaleX(1);
}

.document-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #fff5eb 0%, #ffe6d5 100%);
    border-radius: 14px;
    transition: all var(--transition-medium);
    position: relative;
    overflow: hidden;
}

.document-icon::before {
    content: "";
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(
        circle,
        rgba(255, 107, 0, 0.1) 0%,
        transparent 70%
    );
    opacity: 0;
    transition: opacity var(--transition-medium);
}

.document-card:hover .document-icon::before {
    opacity: 1;
    animation: rotate 10s linear infinite;
}

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

.document-icon i {
    font-size: 32px;
    color: var(--primary-color);
    transition: all var(--transition-medium);
    position: relative;
    z-index: 1;
}

.document-card:hover .document-icon i {
    transform: scale(1.1);
    animation: bounce 0.5s ease;
}

@keyframes bounce {
    0%,
    100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-5px);
    }
}

.card-title {
    color: var(--dark-color);
    font-weight: 600;
    transition: color var(--transition-fast);
}

.document-card:hover .card-title {
    color: var(--primary-color);
}

.badge {
    padding: 6px 12px;
    border-radius: 20px;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.badge.bg-primary {
    background: linear-gradient(
        135deg,
        var(--primary-color) 0%,
        var(--primary-light) 100%
    ) !important;
}

.btn {
    border-radius: 12px;
    padding: 10px 20px;
    font-weight: 500;
    transition: all var(--transition-medium);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition:
        width 0.6s,
        height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-primary {
    background: linear-gradient(
        135deg,
        var(--primary-color) 0%,
        var(--primary-light) 100%
    );
    border: none;
}

.btn-primary:hover {
    background: linear-gradient(
        135deg,
        var(--primary-dark) 0%,
        var(--primary-color) 100%
    );
}

.btn-outline-primary {
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-outline-primary:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.btn-group .btn {
    border-radius: 12px;
    margin: 0 2px;
}

.btn-group .btn:first-child {
    border-radius: 12px 0 0 12px;
}

.btn-group .btn:last-child {
    border-radius: 0 12px 12px 0;
}

.modal.fade .modal-dialog {
    transform: scale(0.8);
    transition: transform var(--transition-medium);
}

.modal.show .modal-dialog {
    transform: scale(1);
}

.modal-content {
    border-radius: 20px;
    border: none;
    box-shadow: var(--shadow-lg);
    animation: modalSlideIn 0.3s ease-out;
}

@keyframes modalSlideIn {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    background: linear-gradient(
        135deg,
        var(--primary-color) 0%,
        var(--primary-light) 100%
    );
    color: white;
    border-radius: 20px 20px 0 0;
    border: none;
}

.modal-header .btn-close {
    filter: brightness(0) invert(1);
}

.pdf-viewer {
    background: var(--gray-light);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.pdf-viewer iframe {
    display: block;
    width: 100%;
    min-height: 800px;
    border: none;
}

footer {
    background: whitesmoke;
    color: black;
    padding: 20px 0;
    margin-top: auto;
}

footer p {
    margin: 0;
    opacity: 0.9;
}

.loading {
    display: inline-block;
    width: 24px;
    height: 24px;
    border: 3px solid rgba(255, 107, 0, 0.1);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 0.8s linear infinite;
}

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

.scroll-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(
        135deg,
        var(--primary-color) 0%,
        var(--primary-light) 100%
    );
    color: white;
    border: none;
    box-shadow: 0 4px 12px rgba(255, 107, 0, 0.3);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-medium);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.scroll-to-top.show {
    opacity: 1;
    visibility: visible;
    animation: bounceIn 0.5s ease;
}

@keyframes bounceIn {
    0% {
        transform: scale(0);
    }
    50% {
        transform: scale(1.1);
    }
    100% {
        transform: scale(1);
    }
}

.scroll-to-top:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(255, 107, 0, 0.4);
}

@media (max-width: 991px) {
    .mobile-search-form {
        max-width: 220px;
    }
}

@media (max-width: 768px) {
    :root {
        --categories-bar-height: 60px;
    }

    body {
        padding-top: calc(var(--navbar-height) + var(--categories-bar-height));
    }

    .category-chip {
        padding: 6px 14px;
        font-size: 0.85rem;
    }

    .document-icon {
        width: 48px;
        height: 48px;
    }

    .document-icon i {
        font-size: 28px;
    }
}

@media (max-width: 576px) {
    .navbar-brand {
        font-size: 1rem;
    }

    .mobile-search-form {
        max-width: 160px;
    }

    .mobile-search-form .form-control {
        padding: 6px 10px;
        font-size: 0.85rem;
    }

    .category-chip {
        padding: 5px 10px;
        font-size: 0.8rem;
    }

    .category-chip span {
        display: inline;
    }

    .category-chip i {
        margin-right: 4px;
    }
}

@media (max-width: 400px) {
    .mobile-search-form {
        max-width: 130px;
    }

    .category-chip span {
        display: none;
    }

    .category-chip i {
        margin-right: 0;
        font-size: 1.1rem;
    }

    .category-chip {
        padding: 8px;
        border-radius: 50%;
        width: 40px;
        height: 40px;
        justify-content: center;
    }
}

.page-transition {
    animation: pageEnter 0.4s ease-out;
}

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

.card,
.btn,
.category-chip,
.dropdown-item {
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
}

::selection {
    background: var(--primary-light);
    color: white;
}

::-moz-selection {
    background: var(--primary-light);
    color: white;
}