:root, [data-theme="light"] {
    --bg-body: #f8fafc;
    --bg-header: #ffffff;
    --bg-card: #ffffff;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] {
    --bg-body: #0f172a;      
    --bg-header: #1e293b;   
    --bg-card: #1e293b;    
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --accent: #3b82f6;
    --accent-hover: #60a5fa;
    --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
}

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

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-body);
    color: var(--text-main);
    transition: background-color 0.4s ease, color 0.4s ease;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

#main-kopf {
    background-color: var(--bg-header);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.4s ease, border-color 0.4s ease;
}

.logo-text {
    font-size: 1.75rem;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.logo-img {
    height: 7.5rem;
    object-fit: contain;
}

#content-bereich {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
}

.login-card {
    background-color: var(--bg-card);
    border-radius: 16px;
    padding: 3rem 2.5rem;
    width: 100%;
    max-width: 420px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    transition: background-color 0.4s ease, border-color 0.4s ease, box-shadow 0.4s ease;
}

.login-card h2 {
    margin-bottom: 2rem;
    text-align: center;
    font-size: 1.8rem;
    font-weight: 700;
}

.upload-card {
    background-color: var(--bg-card);
    border-radius: 16px;
    padding: 2.5rem;
    width: 100%;
    max-width: 480px;
    margin: 0 auto 2.5rem auto;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    transition: background-color 0.4s ease, border-color 0.4s ease;
}

.upload-card h2 {
    margin-bottom: 1.5rem;
    font-size: 1.6rem;
    font-weight: 700;
    text-align: center;
    color: var(--text-main);
}

.upload-form-group {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.file-input {
    width: 100%;
    background-color: var(--accent);
    border: none;
    border-radius: 8px;
    color: transparent;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.1s ease;
    display: block;
    overflow: hidden;
}

.file-input:hover {
    background-color: var(--accent-hover);
}

.file-input:active {
    transform: scale(0.98);
}

.file-input::file-selector-button {
    background: transparent;
    border: none;
    color: #ffffff;
    padding: 0.9rem;
    font-size: 1.1rem;
    font-weight: 700;
    width: 100%;
    cursor: pointer;
    text-align: center;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    margin-bottom: 2rem;
}

input[type="text"], 
input[type="password"] {
    padding: 0.85rem 1.2rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-body);
    color: var(--text-main);
    font-size: 1rem;
    transition: border-color 0.3s ease, box-shadow 0.3s ease, background-color 0.4s ease;
}

input[type="text"]:focus, 
input[type="password"]:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.input-group input[type="radio"] {
    display: none;
}

.toggle-labels {
    display: flex;
    background-color: var(--bg-body);
    border-radius: 8px;
    padding: 0.3rem;
    border: 1px solid var(--border-color);
    margin-top: 0.5rem;
}

.toggle-labels label {
    flex: 1;
    text-align: center;
    padding: 0.6rem;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-muted);
    transition: background-color 0.3s ease, color 0.3s ease;
}

#log-in:checked ~ .toggle-labels label[for="log-in"],
#sign-up:checked ~ .toggle-labels label[for="sign-up"] {
    background-color: var(--accent);
    color: #ffffff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.btn-primary {
    width: 100%;
    padding: 0.9rem;
    background-color: var(--accent);
    color: #ffffff;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.1s ease;
}

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

.btn-primary:active {
    transform: scale(0.98);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
    width: 100%;
    box-sizing: border-box;
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 1.5rem;
}

.video-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.video-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 20px rgba(0, 0, 0, 0.15);
}

.video-wrapper {
    position: relative;
    width: 100%;
    background: #000;
    aspect-ratio: 16 / 9;
}

.video-wrapper video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.video-info {
    padding: 1.25rem;
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 0.75rem;
    align-items: center;
}

.video-info h3 {
    grid-column: 1;
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-main);
}

.note-container {
    grid-column: 2;
    grid-row: 1;
    display: flex;         
    align-items: center;   
    gap: 0.5rem;           
}

.video-info p {
    grid-column: 1 / span 2;
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.4;
    margin-bottom: 0.25rem;
}

#Note {
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--accent);
    cursor: pointer;
    white-space: nowrap; 
}

#benotung {
    width: 55px;
    height: 38px;
    text-align: center;
    font-size: 1rem;
    font-weight: 700;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-body);
    color: var(--text-main);
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.video-info input[type="text"], 
.comment-input{
    grid-column: 1 / span 2;
    display: block;
    width: 100%;
    margin-top: 0.5rem;
    padding: 0.85rem 1.2rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-body);
    color: var(--text-main);
    font-size: 0.95rem;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}
input[type="number"] {

}

#benotung:focus, 
.video-info input[type="text"]:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.theme-tausch {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
}

#theme-toggle {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    width: 4rem;
    height: 4rem;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s ease, background-color 0.4s ease;
}

#theme-toggle:hover {
    transform: scale(1.1);
}

input[type="number"] {
    width: 55px;
    height: 38px;
    text-align: center;
    font-size: 1rem;
    font-weight: 700;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-body);
    color: var(--text-main);
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

[data-theme="light"] .icon-sun { display: none; }
[data-theme="light"] .icon-moon { display: block; }

[data-theme="dark"] .icon-sun { display: block; }
[data-theme="dark"] .icon-moon { display: none; }