/* CSS Variables (Custom Properties) */
:root {
    --primary-color: #007bff;
    --primary-color-dark: #0056b3;
    --secondary-color: #1a2533;
    --secondary-color-light: #2c3e50;
    --accent-color: #0088cc; /* Telegram Blue */
    --accent-color-dark: #006da3;
    --background-color: #f8f9fa; /* Lighter background */
    --card-background-color: #ffffff;
    --text-color: #343a40;
    --text-color-light: #6c757d;
    --text-color-inverted: #ffffff;
    --border-color: #dee2e6;
    --border-radius: 6px;
    --spacing-unit: 1rem; /* approx 16px */
    --header-height: 70px; /* Example */
    --footer-height: 100px; /* Example */
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
}

/* Basic Reset & Body Styling */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 100%; /* Base font size */
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    background-color: var(--background-color);
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    padding-top: var(--header-height); /* Prevent content overlap with fixed header (adjust if header isn't fixed) */
}

.container {
    width: 92%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-unit);
}

/* Screen Reader Only */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Header */
.site-header {
    background-color: var(--secondary-color);
    color: var(--text-color-inverted);
    padding: 0; /* Let container handle padding */
    text-align: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    position: fixed; /* Keep header visible */
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    z-index: 1000;
    display: flex;
    align-items: center; /* Vertically center content */
    justify-content: center; /* Horizontally center content */
}
.site-header .container {
     width: 100%; /* Use full width inside fixed header */
}
.site-header h1 a {
    color: var(--text-color-inverted);
    text-decoration: none;
    font-size: clamp(1.3rem, 4vw, 1.8rem); /* Responsive font size */
    font-weight: 600;
}
.site-header p {
    color: #bdc3c7; /* Lighter grey */
    font-size: clamp(0.8rem, 2vw, 0.9rem);
    margin-top: 0.25rem;
}


/* Footer */
.site-footer {
    background-color: var(--secondary-color);
    color: #bdc3c7;
    padding: calc(var(--spacing-unit) * 1.5) 0;
    text-align: center;
    margin-top: auto; /* Pushes footer to bottom */
    font-size: 0.85em;
    min-height: var(--footer-height);
}
.site-footer p { margin-bottom: 0.5rem; }
.site-footer a {
    color: #ecf0f1; /* Even lighter */
    text-decoration: none;
    transition: color 0.3s ease;
}
.site-footer a:hover,
.site-footer a:focus {
    color: var(--text-color-inverted);
    text-decoration: underline;
}
.site-footer nav {
    margin-top: 0.5rem;
}


/* Top Ad Container */
#ad-top {
    padding-top: calc(var(--spacing-unit) * 1.5);
    padding-bottom: var(--spacing-unit);
    background-color: var(--card-background-color);
    border-bottom: 1px solid var(--border-color);
    margin-bottom: calc(var(--spacing-unit) * 1.5);
    text-align: center;
}

/* Main Layout */
.main-content {
    display: flex;
    flex-wrap: wrap;
    gap: calc(var(--spacing-unit) * 1.5);
    flex-grow: 1;
    padding-top: var(--spacing-unit);
    padding-bottom: calc(var(--spacing-unit) * 2);
}

.player-area {
    flex: 3;
    min-width: min(60vw, 400px); /* Responsive minimum width */
    background-color: var(--card-background-color);
    padding: calc(var(--spacing-unit) * 1.5);
    border-radius: var(--border-radius);
    box-shadow: 0 3px 10px rgba(0,0,0,0.07);
    display: flex; /* Allow flex column layout */
    flex-direction: column;
}

.sidebar {
    flex: 1;
    min-width: 280px;
    background-color: var(--card-background-color);
    padding: calc(var(--spacing-unit) * 1.25);
    border-radius: var(--border-radius);
    box-shadow: 0 3px 10px rgba(0,0,0,0.07);
    text-align: center;
    height: fit-content;
}
.sidebar h2 {
    margin-bottom: var(--spacing-unit);
    color: var(--secondary-color);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: calc(var(--spacing-unit) / 2);
    font-size: 1.1rem;
    font-weight: 600;
}
.sidebar-content p {
    font-size: 0.9em;
    color: var(--text-color-light);
    line-height: 1.5;
    margin-bottom: var(--spacing-unit);
}

/* Player Wrapper & Container */
.player-wrapper {
    position: relative;
    background-color: #000;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    margin-bottom: calc(var(--spacing-unit) * 1.5);
    padding-bottom: 56.25%; /* 16:9 Aspect Ratio */
    height: 0;
    overflow: hidden;
    flex-shrink: 0; /* Prevent wrapper from shrinking */
}
#player-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-color-inverted);
    background-color: #111; /* Darker bg for placeholder */
}

#player-container iframe,
#player-container video {
    display: none;
    width: 100%;
    height: 100%;
    border: none;
    background-color: #000;
}

#player-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-unit);
}
#player-placeholder svg {
    color: var(--text-color-light);
    opacity: 0.7;
    margin-bottom: 0.5rem;
}
#player-placeholder p {
    font-size: 1rem;
    color: #ccc;
}

/* Loading Indicator */
.loading-indicator {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: rgba(0, 0, 0, 0.7); /* Semi-transparent overlay */
    z-index: 10;
    color: white;
}
.spinner {
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin-bottom: 1rem;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Controls Section */
.controls-section {
    margin-top: var(--spacing-unit);
    padding-top: var(--spacing-unit);
    border-top: 1px solid var(--border-color);
    flex-grow: 1; /* Take remaining space in player-area */
}
.controls-section > h2 { /* The main heading */
    margin-bottom: calc(var(--spacing-unit) * 1.5);
    text-align: center;
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--secondary-color);
}

.control-group {
    margin-bottom: calc(var(--spacing-unit) * 2);
}
.control-group h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-unit);
    text-align: center;
    color: var(--secondary-color-light);
}
.channel-buttons {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: calc(var(--spacing-unit) / 1.5);
}

/* M3U8 Input Area */
.m3u8-input-area {
    display: flex;
    flex-wrap: wrap; /* Allow wrapping */
    gap: calc(var(--spacing-unit) / 2);
    align-items: stretch; /* Make items same height */
}
.m3u8-input-area input[type="url"] {
    flex-grow: 1;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 0.95rem;
    min-width: 200px;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}
.m3u8-input-area input[type="url"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.25);
}
.m3u8-input-area button {
    flex-shrink: 0; /* Prevent button from shrinking */
}

/* Buttons */
.btn {
    background-color: var(--primary-color);
    color: var(--text-color-inverted);
    padding: 10px 18px; /* More padding */
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    text-decoration: none;
    font-size: 0.95em;
    font-weight: 500;
    transition: background-color 0.2s ease-out, box-shadow 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    white-space: nowrap;
    line-height: 1.5; /* Align text properly */
    -webkit-appearance: none; /* Fix iOS button styles */
    -moz-appearance: none;
    appearance: none;
}
.btn:hover {
    background-color: var(--primary-color-dark);
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}
.btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.35);
}
.btn:active {
    transform: translateY(1px);
    box-shadow: none;
}

/* Active Channel Button */
.btn.channel-btn.active {
    background-color: var(--primary-color-dark);
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.15);
    font-weight: 600;
}


.btn-telegram {
    background-color: var(--accent-color);
}
.btn-telegram:hover {
    background-color: var(--accent-color-dark);
}
.btn-telegram:focus {
     box-shadow: 0 0 0 3px rgba(0, 136, 204, 0.4);
}

.btn-small { /* For sidebar */
    padding: 8px 12px;
    font-size: 0.85em;
}

/* Telegram Join Section Specific */
.telegram-join {
    text-align: center;
    padding: calc(var(--spacing-unit) * 1.5);
    background-color: #e7f3fe;
    border: 1px solid #bde0fe;
    border-radius: var(--border-radius);
}
.telegram-join p {
    margin-top: calc(var(--spacing-unit) / 1.5);
    font-size: 0.9em;
    color: var(--text-color);
}
.telegram-join .btn {
     margin-top: var(--spacing-unit);
}

/* Ad Containers Styling */
.ad-container {
    margin-bottom: calc(var(--spacing-unit) * 1.5);
    padding: var(--spacing-unit) 0;
    min-height: 50px;
    background-color: transparent;
    display: block;
    width: 100%;
    text-align: center; /* Center ads */
}
.ad-container.ad-below-player {
     margin-top: calc(var(--spacing-unit) * 1.5);
     padding-top: calc(var(--spacing-unit) * 1.5);
     border-top: 1px solid var(--border-color); /* Separator line */
}
.ad-label { /* Standardize Ad label */
    font-size: 0.7rem;
    color: var(--text-color-light);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    display: block; /* Make sure it takes full width */
}
.ad-note { /* Sidebar ad note */
    font-size: 0.8em;
    color: var(--text-color-light);
    margin-top: calc(var(--spacing-unit) / 2);
}


/* Content Description */
.content-description {
    margin-top: calc(var(--spacing-unit) * 2);
    padding-top: calc(var(--spacing-unit) * 1.5);
    border-top: 1px solid var(--border-color);
}
.content-description h2 {
    color: var(--secondary-color);
    margin-bottom: var(--spacing-unit);
    font-weight: 600;
    font-size: 1.3rem;
}
.content-description p {
    margin-bottom: var(--spacing-unit);
    color: var(--text-color);
    font-size: 0.95rem;
}
.content-description p.keywords {
    font-size: 0.8rem;
    color: var(--text-color-light);
    font-style: italic;
}
.content-description a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}
.content-description a:hover,
.content-description a:focus {
    color: var(--primary-color-dark);
    text-decoration: underline;
}

/* Responsive Adjustments */
@media (max-width: 992px) {
    body { padding-top: 0; } /* Remove padding if header is not fixed */
    .site-header { position: static; height: auto; padding: var(--spacing-unit) 0; } /* Static header on mobile */

    .main-content {
        flex-direction: column;
    }
    .player-area, .sidebar {
        width: 100%;
        flex: none;
        min-width: unset;
    }
    .player-wrapper {
       /* No change needed if aspect ratio is maintained */
    }
}

@media (max-width: 768px) {
    .container {
        width: 95%;
        padding: 0 calc(var(--spacing-unit) * 0.75);
    }
    #ad-top { padding: var(--spacing-unit) 0; margin-bottom: var(--spacing-unit); }
    .site-header { padding: calc(var(--spacing-unit) * 0.75) 0; }

    .player-area { padding: var(--spacing-unit); }
    .sidebar { padding: var(--spacing-unit); }

    .controls-section > h2 { font-size: 1.2rem; }
    .control-group h3 { font-size: 1rem; }

    .m3u8-input-area { flex-direction: column; align-items: stretch; }
    .m3u8-input-area input[type="url"] { width: 100%; }
    .m3u8-input-area button { width: 100%; }

    .channel-buttons { gap: calc(var(--spacing-unit) / 2); }
    .btn { padding: 12px 15px; font-size: 1rem; }

    .site-footer { padding: var(--spacing-unit) 0; font-size: 0.8rem; }
}