@font-face {
    font-family: 'Luma Sans';
    src: local('Arial');
}

:root[data-theme="dark"] {
    --bg-color: #091b3f;
    --text-color: #ffffff;
    --text-muted: rgba(255, 255, 255, 0.7);
    --header-bg: rgba(9, 27, 63, 0.95);
    --hover-bg: rgba(255, 255, 255, 0.1);
    --accent-color: #89e7ff;
}

:root[data-theme="light"] {
    --bg-color: #89e7ff;
    --text-color: #000000;
    --text-muted: rgba(0, 0, 0, 0.7);
    --header-bg: rgba(137, 231, 255, 0.95);
    --hover-bg: rgba(0, 0, 0, 0.1);
    --accent-color: #091b3f;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease, transform 0.2s ease, opacity 0.2s ease;
}

body {
    font-family: 'Luma Sans', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
}

#main-header {
    position: fixed;
    top: 0;
    width: 100%;
    height: 70px;
    background-color: var(--header-bg);
    backdrop-filter: blur(10px);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 1rem;
    cursor: pointer;
}

.logo-placeholder {
    font-size: 1.8rem;
    color: var(--text-color);
}

.site-title {
    font-size: 1.4rem;
    font-weight: bold;
}

#main-nav {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.nav-icon {
    color: var(--text-color);
    font-size: 1.3rem;
    text-decoration: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 8px;
}

.nav-icon:hover {
    background-color: var(--hover-bg);
    transform: scale(1.05);
}

.dropdown-container {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    background-color: var(--header-bg);
    border-radius: 8px;
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

.dropdown-container:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

#app-content {
    margin-top: 80px;
    padding: 2rem;
    min-height: calc(100vh - 80px);
}

.hidden {
    display: none !important;
}

.mobile-only { display: none; }
.desktop-only { display: inline-block; }

#toast-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 9999;
}

.toast {
    background-color: var(--header-bg);
    color: var(--text-color);
    padding: 1rem 1.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
    transform: translateX(100%);
    opacity: 0;
    transition: transform 0.3s ease, opacity 0.3s ease;
    border-left: 4px solid var(--text-muted);
}

.toast.show {
    transform: translateX(0);
    opacity: 1;
}

.toast-success { border-left-color: #28a745; }
.toast-error { border-left-color: #dc3545; }

#modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(5px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9998;
    opacity: 1;
    transition: opacity 0.2s ease;
}

#modal-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.modal-box {
    background-color: var(--bg-color);
    color: var(--text-color);
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    display: flex;
    flex-direction: column;
    transform: scale(0.9);
    opacity: 0;
    transition: transform 0.2s ease, opacity 0.2s ease;
}

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

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

.modal-close-btn {
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 1.5rem;
    cursor: pointer;
}

.modal-body {
    padding: 1.5rem;
    overflow-y: auto;
}

.modal-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--hover-bg);
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
}

.btn {
    padding: 0.5rem 1.5rem;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: bold;
    background-color: var(--hover-bg);
    color: var(--text-color);
}

.btn-secondary {
    background-color: transparent;
    border: 1px solid var(--text-muted);
}

.btn-primary {
    background-color: var(--accent-color);
    color: var(--bg-color);
}

@media (max-width: 768px) {
    .desktop-only { display: none; }
    .desktop-nav { display: none; }
    .mobile-only { display: inline-block; }
    
    #main-header {
        padding: 0 1rem;
    }
}