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

:root {
    --nav-size: 70px;
    --nav-width: 200px;
    --transition-speed: 0.3s;
}

body.text-hide {
    --nav-width: 90px;
}

body {
    font-family: 'Segoe UI', system-ui, sans-serif;
    background: var(--bg-color);
    color: var(--text-color);
    height: 100vh;
    overflow: hidden;
    transition: background var(--transition-speed) ease, color var(--transition-speed) ease;
}

.theme-dark {
    --bg-color: #121212;
    --text-color: #ffffff;
    --nav-bg: #1e1e1e;
    --card-bg: #2a2a2a;
}
.theme-light {
    --bg-color: #f4f5f7;
    --text-color: #1a1a1a;
    --nav-bg: #ffffff;
    --card-bg: #e2e8f0;
}
.theme-grad-blue {
    --bg-color: linear-gradient(135deg, #0f2027, #203a43, #2c5364);
    --text-color: #ffffff;
    --nav-bg: rgba(0, 0, 0, 0.4);
    --card-bg: rgba(255, 255, 255, 0.1);
}
.theme-grad-purple {
    --bg-color: linear-gradient(135deg, #41295a, #2f0743);
    --text-color: #ffffff;
    --nav-bg: rgba(0, 0, 0, 0.4);
    --card-bg: rgba(255, 255, 255, 0.1);
}

#app-container {
    display: flex;
    height: 100vh;
    width: 100vw;
}

.nav-top #app-container { flex-direction: column; }
.nav-bottom #app-container { flex-direction: column-reverse; }
.nav-left #app-container { flex-direction: row; }
.nav-right #app-container { flex-direction: row-reverse; }

#navbar {
    position: relative;
    background: var(--nav-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1rem;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    z-index: 10;
    flex-shrink: 0;
    transition: width 0.3s ease, height 0.3s ease, padding-top 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-top #navbar, .nav-bottom #navbar {
    height: var(--nav-size);
    width: 100%;
    flex-direction: row;
}

.nav-left #navbar, .nav-right #navbar {
    width: var(--nav-width);
    height: 100%;
    flex-direction: column;
    justify-content: flex-start;
    padding-top: 2rem;
}

body.show-logo.nav-left #navbar, 
body.show-logo.nav-right #navbar {
    padding-top: 6rem;
}

#nav-logo {
    position: absolute;
    font-size: 2.2rem;
    font-weight: 900;
    color: var(--text-color);
    opacity: 0;
    pointer-events: none;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-top #nav-logo, .nav-bottom #nav-logo {
    left: 2rem;
    top: 50%;
    transform: translateY(-50%) scale(0.5);
}

.nav-left #nav-logo, .nav-right #nav-logo {
    top: 1.5rem;
    left: 50%;
    transform: translateX(-50%) scale(0.5);
}

.nav-top #nav-logo.show, .nav-bottom #nav-logo.show {
    transform: translateY(-50%) scale(1);
    opacity: 1;
}

.nav-left #nav-logo.show, .nav-right #nav-logo.show {
    transform: translateX(-50%) scale(1);
    opacity: 1;
}

.nav-btn {
    background: transparent;
    border: none;
    color: var(--text-color);
    font-size: 1.1rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.25rem;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.2s ease;
    opacity: 0.6;
}

.nav-btn i {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.nav-btn span {
    display: inline-block;
    max-width: 120px;
    margin-left: 0.75rem;
    white-space: nowrap;
    overflow: hidden;
    opacity: 1;
    transition: max-width 0.3s ease, margin 0.3s ease, opacity 0.2s ease;
}

.nav-left .nav-btn, .nav-right .nav-btn {
    width: 90%;
    justify-content: flex-start;
    padding-left: 1.5rem;
}

.nav-btn:hover, .nav-btn.active {
    opacity: 1;
    background: rgba(128, 128, 128, 0.2);
}

.text-hide .nav-btn span {
    max-width: 0;
    margin-left: 0;
    opacity: 0;
    transition: max-width 0.3s ease, margin 0.3s ease, opacity 0.1s ease;
}

.text-hide.nav-left .nav-btn, .text-hide.nav-right .nav-btn {
    justify-content: center;
    padding-left: 0;
    padding-right: 0;
}

#content-area {
    flex-grow: 1;
    padding: 3rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

.page {
    display: none;
    animation: fadeIn 0.4s ease;
}

.page.active {
    display: block;
}

#home.page.active {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;
    text-align: center;
}

.hero-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    max-width: 700px;
    margin: 0 auto;
}

.hero-subtitle {
    font-size: 1.25rem;
    font-weight: 500;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    opacity: 0.6;
    margin-bottom: 0.5rem;
}

.hero-title {
    font-size: 4.5rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--text-color), rgba(128, 128, 128, 0.7));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-desc {
    font-size: 1.2rem;
    opacity: 0.8;
    max-width: 500px;
}

.page h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.page p {
    font-size: 1.1rem;
    opacity: 0.8;
    margin-bottom: 2rem;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.settings-card {
    background: var(--nav-bg);
    padding: 2rem;
    border-radius: 12px;
    max-width: 500px;
}

.setting-group {
    margin-bottom: 1.5rem;
}

.setting-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
    font-weight: 600;
}

.setting-group select {
    width: 100%;
    padding: 0.75rem;
    font-size: 1rem;
    border-radius: 8px;
    border: 1px solid rgba(128, 128, 128, 0.3);
    background: var(--card-bg);
    color: var(--text-color);
    cursor: pointer;
    outline: none;
}

.filter-bar {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.filter-btn {
    background: transparent;
    border: 2px solid var(--text-color);
    color: var(--text-color);
    padding: 0.5rem 1.25rem;
    border-radius: 25px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.2s ease;
    opacity: 0.6;
}

.filter-btn:hover, .filter-btn.active {
    opacity: 1;
    background: var(--text-color);
    color: var(--bg-color);
}

.item-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1.5rem;
    justify-items: center;
}

.round-btn {
    display: block;
    width: 100%;
    max-width: 280px; 
    height: 180px;
    border-radius: 16px;
    background-size: cover;
    background-position: center;
    background-color: var(--card-bg);
    text-decoration: none;
    position: relative;
    overflow: hidden;
    box-shadow: 0 6px 15px rgba(0,0,0,0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer;
}

.round-btn:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 25px rgba(0,0,0,0.4);
}

.round-btn .overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.4); 
    color: #ffffff;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 1.5rem;
    opacity: 0;
    backdrop-filter: blur(0px);
    -webkit-backdrop-filter: blur(0px);
    transition: opacity 0.3s ease, backdrop-filter 0.3s ease, -webkit-backdrop-filter 0.3s ease;
}

.round-btn:hover .overlay {
    opacity: 1;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.overlay h3 {
    font-size: 1.4rem;
    margin-bottom: 0.5rem;
    text-shadow: 0 2px 4px rgba(0,0,0,0.5);
}

.overlay p {
    font-size: 0.95rem;
    opacity: 0.95;
    margin: 0;
    text-shadow: 0 1px 3px rgba(0,0,0,0.5);
}

.pagination-bar {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.page-btn {
    background: transparent;
    border: 1px solid rgba(128, 128, 128, 0.3);
    color: var(--text-color);
    padding: 0.5rem 0.9rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.page-btn:hover, .page-btn.active {
    background: var(--text-color);
    color: var(--bg-color);
    border-color: var(--text-color);
}

.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.modal-content {
    background: var(--nav-bg);
    color: var(--text-color);
    width: 90vw;
    height: 85vh;
    border-radius: 16px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0,0,0,0.5);
    transform: scale(0.9);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.modal-overlay.active .modal-content {
    transform: scale(1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    background: var(--card-bg);
    border-bottom: 1px solid rgba(128, 128, 128, 0.2);
}

#modal-title {
    font-size: 1.1rem;
    font-weight: 600;
}

.modal-actions {
    display: flex;
    gap: 0.75rem;
}

.modal-actions button {
    background: transparent;
    border: none;
    color: var(--text-color);
    font-size: 1.25rem;
    cursor: pointer;
    padding: 0.4rem;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0.8;
    transition: all 0.2s ease;
}

.modal-actions button:hover {
    opacity: 1;
    background: rgba(128, 128, 128, 0.2);
}

#modal-iframe {
    flex-grow: 1;
    width: 100%;
    height: 100%;
    border: none;
}