:root {
    --bg-main: #0f172a;
    --bg-panel: #1e293b;
    --bg-hover: #334155;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --danger: #ef4444;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    height: 100vh;
    overflow: hidden;
}

.screen {
    width: 100%;
    height: 100%;
    display: flex;
}

.hidden {
    display: none !important;
}

/* --- Login Screen --- */
#login-screen {
    justify-content: center;
    align-items: center;
    background: radial-gradient(circle at center, #1e293b 0%, #0f172a 100%);
}

.login-box {
    background-color: var(--bg-panel);
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.5);
    text-align: center;
    width: 100%;
    max-width: 350px;
}

.login-box h2 {
    margin-bottom: 1.5rem;
    font-weight: 600;
}

.login-box input {
    width: 100%;
    padding: 0.75rem;
    margin-bottom: 1rem;
    background: var(--bg-main);
    border: 1px solid #334155;
    border-radius: 6px;
    color: white;
    outline: none;
    transition: border-color 0.2s;
}

.login-box input:focus {
    border-color: var(--accent);
}

.login-box button {
    width: 100%;
    padding: 0.75rem;
    background-color: var(--accent);
    color: white;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
}

.login-box button:hover {
    background-color: var(--accent-hover);
}

.error-msg {
    color: var(--danger);
    margin-top: 1rem;
    font-size: 0.875rem;
    min-height: 1.2rem;
}

/* --- Dashboard Screen --- */
#dashboard-screen {
    flex-direction: column;
}

header {
    background-color: var(--bg-panel);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #334155;
}

header h1 {
    font-size: 1.25rem;
    font-weight: 600;
}

.header-controls button {
    background-color: var(--bg-hover);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    margin-left: 0.5rem;
    cursor: pointer;
    transition: background 0.2s;
}

.header-controls button:hover {
    background-color: var(--accent);
}

main {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* Sidebar */
aside {
    width: 250px;
    background-color: var(--bg-panel);
    border-right: 1px solid #334155;
    display: flex;
    flex-direction: column;
}

aside h3 {
    padding: 1rem;
    font-size: 0.875rem;
    text-transform: uppercase;
    color: var(--text-muted);
    letter-spacing: 0.05em;
    border-bottom: 1px solid #334155;
}

#streams-list {
    list-style: none;
    overflow-y: auto;
    flex: 1;
}

#streams-list li {
    padding: 1rem;
    border-bottom: 1px solid #1e293b;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background 0.2s;
}

#streams-list li:hover {
    background-color: var(--bg-hover);
}

#streams-list li.active {
    background-color: rgba(59, 130, 246, 0.1);
    border-left: 3px solid var(--accent);
}

.add-btn {
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 4px;
    padding: 0.2rem 0.5rem;
    font-size: 0.75rem;
    cursor: pointer;
}

/* Grid Container */
#grid-container {
    flex: 1;
    padding: 1rem;
    display: grid;
    /* Auto-fit grid for responsive layout */
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    grid-auto-rows: min-content;
    gap: 1rem;
    overflow-y: auto;
    background-color: var(--bg-main);
}

.video-card {
    background: black;
    border-radius: 8px;
    overflow: hidden;
    position: relative;
    aspect-ratio: 16 / 9;
    box-shadow: 0 4px 6px rgba(0,0,0,0.3);
}

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

.video-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    padding: 0.5rem;
    background: linear-gradient(to bottom, rgba(0,0,0,0.7) 0%, transparent 100%);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    opacity: 0;
    transition: opacity 0.2s;
}

.video-card:hover .video-overlay {
    opacity: 1;
}

.stream-title {
    color: white;
    font-weight: 600;
    font-size: 0.875rem;
    text-shadow: 0 1px 2px rgba(0,0,0,0.8);
}

.close-btn {
    background: var(--danger);
    color: white;
    border: none;
    border-radius: 4px;
    width: 24px;
    height: 24px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
}

/* Sidebar Toggle */
aside.collapsed { display: none; }

/* Alerts */
.alert-buffering {
    border: 3px solid #f59e0b;
    box-shadow: 0 0 15px rgba(245, 158, 11, 0.5);
}
.alert-offline {
    border: 3px solid var(--danger);
    box-shadow: 0 0 15px rgba(239, 68, 68, 0.5);
}
.alert-offline video { filter: grayscale(100%) brightness(50%); }
.status-badge {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-weight: bold;
    pointer-events: none;
    display: none;
}
.alert-buffering .status-badge, .alert-offline .status-badge { display: block; }

aside { transition: width 0.3s ease; }
aside h3 { display: flex; justify-content: space-between; align-items: center; }
#toggle-sidebar-btn { background: transparent; border: none; color: var(--text-muted); font-size: 1.2rem; cursor: pointer; line-height: 1; }
#toggle-sidebar-btn:hover { color: white; }
aside.collapsed { width: 50px; }
aside.collapsed h3 .title-text { display: none; }
aside.collapsed h3 { justify-content: center; padding: 1rem 0; }
aside.collapsed #streams-list { display: none; }

aside.collapsed {
    display: flex !important;
    width: 50px !important;
}