:root {
    --bg-color: #2c2c2e;         
    --panel-color: #333336;     
    --highlight: #e2b714;        
    --subtle-text: #a0a0a5;  
    --text-color: #f0f0f5;       
    --error-color: #ca4754;      
    --error-extra-color: #7e2a33; 
    --shadow-dark: rgba(0, 0, 0, 0.7);
    --shadow-light: rgba(255, 255, 255, 0.05);
    --transition: 0.2s;
    --border-radius: 12px;
    --seek-percent: 0%;         
    --volume-percent: 100%;     
  }
  * {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }
  body {
    background: var(--bg-color);
    color: var(--text-color);
    font-family: 'Vazirmatn', sans-serif;
    min-height: 100vh;
    direction: rtl;
    overflow-x: hidden;
    line-height: 1.6;
  }
  
  .container {
    max-width: 880px;
    margin: 0 auto;
    padding: 0 1.5rem;
  }
  
  header {
    background: var(--panel-color);
    box-shadow: 0 2px 8px var(--shadow-dark), 0 -2px 8px var(--shadow-light);
  }
  .header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.2rem 0 1rem 0;
  }
  .logo {
    font-size: 2rem;
    font-weight: bold;
    letter-spacing: 2px;
    color: var(--highlight);
  }
  nav {
    display: flex;
    gap: 1.8rem;
  }
  nav a {
    color: var(--text-color);
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 500;
    padding: 0.2em 0.6em;
    border-radius: 7px;
    transition: background var(--transition), color var(--transition);
  }
  nav a:hover {
    background: var(--highlight);
    color: var(--panel-color);
  }
  
  .auth-btns {
    display: flex;
    gap: 0.7rem;
  }
  .login-btn,
  .signup-btn,
  .logout-btn,
  .back-btn {
    font-family: inherit;
    font-size: 1.02rem;
    border: none;
    border-radius: var(--border-radius);
    padding: 0.5em 1.1em;
    font-weight: 600;
    background: none;
    color: var(--highlight);
    cursor: pointer;
    border: 2px solid var(--highlight);
    transition: background var(--transition), color var(--transition), transform var(--transition);
    box-shadow: 3px 3px 8px var(--shadow-dark), -3px -3px 8px var(--shadow-light);
  }
  .login-btn:hover,
  .signup-btn:hover,
  .logout-btn:hover,
  .back-btn:hover {
    background: var(--highlight);
    color: var(--panel-color);
    transform: translateY(-3px) scale(1.03);
  }
  .main-content {
    margin-top: 2.7rem;
    margin-bottom: 3rem;
  }

  .hero {
    text-align: center;
    margin-bottom: 3.5rem;
  }
  .hero h1 {
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 1.1rem;
    color: var(--text-color);
  }
  .accent {
    color: var(--highlight);
    font-weight: 900;
  }
  .hero p {
    color: var(--subtle-text);
    font-size: 1.13rem;
    margin-bottom: 2.5rem;
  }
  .search-box {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    margin: 0 auto;
    max-width: 400px;
    background: var(--panel-color);
    border-radius: var(--border-radius);
    border: 1.5px solid var(--subtle-text);
    box-shadow: 2px 2px 5px var(--shadow-dark), -2px -2px 5px var(--shadow-light);
    padding: 0.32em 0.7em;
    transition: box-shadow var(--transition);
  }
  .search-box input {
    flex: 1;
    border: none;
    background: none;
    color: var(--text-color);
    font-size: 1.04rem;
    outline: none;
    padding: 0.5em 0.6em;
    text-align: right;
  }
  .search-box button {
    border: none;
    background: var(--highlight);
    border-radius: 50%;
    width: 38px;
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background var(--transition), transform var(--transition);
    box-shadow: 2px 2px 5px var(--shadow-dark), -2px -2px 5px var(--shadow-light);
  }
  .search-box button:hover {
    background: #ffe66c;
    transform: translateY(-2px);
  }
  .playlist-section {
    margin: 0 auto 3rem auto;
  }
  .playlist-section h2 {
    color: var(--highlight);
    font-size: 1.4rem;
    margin-bottom: 1.2rem;
    text-align: right;
    letter-spacing: 1px;
  }
  .playlist-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
  }
  .playlist-card {
    background: var(--panel-color);
    border-radius: var(--border-radius);
    box-shadow: 2px 2px 8px var(--shadow-dark), -2px -2px 8px var(--shadow-light);
    cursor: pointer;
    transition: box-shadow var(--transition), transform var(--transition), border var(--transition);
    border: 1.7px solid var(--subtle-text);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
  .playlist-card:hover {
    border: 1.7px solid var(--highlight);
    box-shadow: 4px 4px 16px rgba(226, 183, 20, 0.2), -4px -4px 16px rgba(255, 255, 255, 0.1);
    transform: translateY(-5px) scale(1.03);
  }
  .playlist-card img {
    width: 100%;
    height: 115px;
    object-fit: cover;
    border-radius: var(--border-radius) var(--border-radius) 0 0;
  }
  .playlist-info {
    padding: 1rem;
    width: 100%;
  }
  .playlist-title {
    font-size: 1.05rem;
    font-weight: bold;
    color: var(--text-color);
    margin-bottom: 0.35rem;
  }
  .playlist-desc {
    color: var(--subtle-text);
    font-size: 0.98rem;
    letter-spacing: 0.1px;
    opacity: 0.87;
  }
  footer {
    background: var(--panel-color);
    color: var(--subtle-text);
    text-align: center;
    padding: 1.5rem 0 1.2rem 0;
    border-radius: var(--border-radius) var(--border-radius) 0 0;
    font-size: 1.06rem;
    margin-top: 2rem;
    box-shadow: 2px -2px 8px var(--shadow-dark), -2px 2px 8px var(--shadow-light);
  }
  #authPopup,
  #logoutConfirm {
    position: fixed;
    inset: 0;
    background: rgba(44, 46, 49, 0.93);
    display: none;      
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(7px);
    z-index: 9999;
  }
  
  #authPopup .popup-content,
  #logoutConfirm .popup-content {
    background: var(--panel-color);
    border-radius: var(--border-radius);
    box-shadow: 4px 4px 16px var(--shadow-dark), -4px -4px 16px var(--shadow-light);
    padding: 2rem 2.2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 90%;
    max-width: 360px;
    position: relative;
    animation: fadeInPanel var(--transition) ease-out;
  }
  #authPopup .popup-content .close-btn,
  #logoutConfirm .popup-content .close-btn {
    position: absolute;
    top: 1rem;
    left: 1rem;
    background: none;
    border: none;
    font-size: 1.8rem;
    color: var(--highlight);
    cursor: pointer;
    transition: color var(--transition), transform var(--transition);
  }
  #authPopup .popup-content .close-btn:hover,
  #logoutConfirm .popup-content .close-btn:hover {
    color: #ffe66c;
    transform: scale(1.1);
  }
  #authPopup .popup-content h3 {
    color: var(--highlight);
    font-size: 1.3rem;
    margin-bottom: 1rem;
    font-weight: 700;
    text-align: center;
    line-height: 1.2;
  }

  #authPopup .popup-content form {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    width: 100%;
  }
  
  #authPopup .popup-content form input[type="email"],
  #authPopup .popup-content form input[type="password"] {
    width: 100%;
    padding: 0.75em 1em;
    margin: 0.5em 0;          
    border: 2px solid var(--subtle-text);
    border-radius: 8px;
    background: #3b3b3f;
    color: var(--text-color);
    font-size: 1rem;
    font-family: 'Vazirmatn', sans-serif;
    outline: none;
    box-shadow: inset 2px 2px 6px var(--shadow-dark), inset -2px -2px 6px var(--shadow-light);
    text-align: right;
    transition: background var(--transition), box-shadow var(--transition), border-color var(--transition);
  }
  
  #authPopup .popup-content form input::placeholder {
    color: var(--subtle-text);
    opacity: 0.8;
  }
  
  #authPopup .popup-content form input:focus {
    background: #424246;
    border-color: var(--highlight);
    box-shadow: inset 2px 2px 8px var(--shadow-dark), inset -2px -2px 8px var(--shadow-light);
  }
  
  #authPopup .popup-content form button.confirm-btn {
    width: 100%;
    padding: 0.85em 0;
    margin-top: 1rem;
    background: var(--highlight);
    color: var(--panel-color);
    font-size: 1.02rem;
    font-weight: bold;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
    box-shadow: 3px 3px 10px var(--shadow-dark), -3px -3px 10px var(--shadow-light);
    font-family: 'Vazirmatn', sans-serif;
  }
  #authPopup .popup-content form button.confirm-btn:hover {
    background: #ffe66c;
    transform: translateY(-2px);
    box-shadow: 4px 4px 14px var(--shadow-dark), -4px -4px 14px var(--shadow-light);
  }
  
  #authPopup .popup-content .auth-msg {
    margin-top: 0.6rem;
    font-size: 0.95rem;
    min-height: 1.2rem;
    text-align: center;
    font-family: 'Vazirmatn', sans-serif;
  }
  #authPopup .popup-content .auth-msg.success {
    color: #32e379;
    font-weight: bold;
  }
  #authPopup .popup-content .auth-msg.error {
    color: var(--error-color);
    font-weight: bold;
  }
  
  #authPopup .popup-content .auth-switch {
    margin-top: 0.8rem;
    font-size: 0.95rem;
    text-align: center;
    color: var(--subtle-text);
    font-family: 'Vazirmatn', sans-serif;
  }
  #authPopup .popup-content .auth-switch span {
    color: var(--highlight);
    cursor: pointer;
    font-weight: 700;
    transition: background var(--transition), color var(--transition);
    padding: 0 0.3em;
    border-radius: 4px;
  }
  #authPopup .popup-content .auth-switch span:hover {
    background: var(--highlight);
    color: var(--panel-color);
  }

  #logoutConfirm .popup-content.confirm-popup h3 {
    color: var(--text-color);
    margin-bottom: 1.5rem;
    font-size: 1.15rem;
    text-align: center;
  }
  .confirm-buttons {
    display: flex;
    flex-direction: row; 
    flex-wrap: nowrap;  
    justify-content: center;
    gap: 1rem; 
  }
  .confirm-buttons .confirm-yes,
  .confirm-buttons .confirm-no {
    flex: 0;
    padding: 0.7em 0;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: background var(--transition), color var(--transition), transform var(--transition);
    box-shadow: 3px 3px 8px var(--shadow-dark), -3px -3px 8px var(--shadow-light);
    min-width: 100px;
  }
  .confirm-buttons .confirm-yes {
    background: var(--error-color);
    color: #fff;
  }
  .confirm-buttons .confirm-yes:hover {
    background: var(--error-extra-color);
    transform: translateY(-2px);
  }
  .confirm-buttons .confirm-no {
    background: var(--subtle-text);
    color: var(--text-color);
  }
  .confirm-buttons .confirm-no:hover {
    background: var(--panel-color);
    transform: translateY(-2px);
  }
  
  .player-container {
    max-width: 540px;
    margin: 3rem auto;
    background: var(--panel-color);
    border-radius: var(--border-radius);
    box-shadow: 5px 5px 15px var(--shadow-dark), -5px -5px 15px var(--shadow-light);
    padding: 2.5rem 2rem;
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    animation: fadeInPanel var(--transition) ease-out;
  }
  
  .player-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--highlight);
    margin-bottom: 1.8rem;
    text-align: center;
  }
  .controls-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.2rem;
    width: 100%;
    margin-bottom: 1.6rem;
  }
  
  .play-btn {
    width: 60px;
    height: 60px;
    background: var(--panel-color);
    border: 3px solid var(--highlight);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background var(--transition), transform var(--transition);
    box-shadow: 4px 4px 10px var(--shadow-dark), -4px -4px 10px var(--shadow-light);
  }
  .play-btn:hover {
    background: var(--highlight);
    transform: translateY(-3px) scale(1.05);
  }
  .play-btn svg {
    fill: var(--highlight);
    width: 28px;
    height: 28px;
    transition: fill var(--transition);
  }
  .play-btn:hover svg {
    fill: var(--panel-color);
  }
  
  .repeat-btn {
    width: 52px;
    height: 52px;
    background: var(--panel-color);
    border: 2px solid var(--highlight);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition:
      background var(--transition),
      transform var(--transition),
      box-shadow var(--transition),
      border-color var(--transition);
  }
  .repeat-btn svg {
    fill: var(--highlight);
    width: 28px;
    height: 28px;
    transition: fill var(--transition);
  }
  .repeat-btn:hover {
    background: rgba(226, 183, 20, 0.1);
    transform: translateY(-2px) scale(1.05);
    box-shadow:
      2px 2px 8px var(--shadow-dark),
      -2px -2px 8px var(--shadow-light);
  }
  .repeat-btn:hover svg {
    fill: #ffe66c;
  }
  
  .repeat-btn.active {
    background: var(--highlight);
    border-color: var(--highlight);
    box-shadow:
      4px 4px 12px rgba(0, 0, 0, 0.5),
      -4px -4px 12px rgba(255, 255, 255, 0.1);
    transform: scale(1.1);
  }
  .repeat-btn.active svg {
    fill: var(--panel-color);
    filter: drop-shadow(1px 1px 2px var(--shadow-dark));
  }
  .repeat-btn.active:hover {
    background: #ffe66c;
    box-shadow:
      6px 6px 16px rgba(0, 0, 0, 0.5),
      -6px -6px 16px rgba(255, 255, 255, 0.1);
    transform: translateY(-2px) scale(1.15);
  }
  .repeat-btn.active:hover svg {
    fill: var(--panel-color);
  }
  
  .download-btn {
    background: var(--panel-color);
    border: none;
    cursor: pointer;
    transition: transform var(--transition), filter var(--transition);
  }
  .download-btn svg {
    fill: var(--highlight);
    width: 28px;
    height: 28px;
    transition: fill var(--transition), filter var(--transition);
  }
  .download-btn:hover svg {
    fill: #ffe66c;
    filter: drop-shadow(2px 2px 4px var(--shadow-dark));
  }
  
  .time-display {
    font-size: 1rem;
    color: var(--text-color);
    min-width: 5.5rem;
    text-align: center;
    font-weight: 500;
    letter-spacing: 0.5px;
  }
  
  .seek-row {
    width: 100%;
    margin-bottom: 1.8rem;
  }
  #seekBar {
    direction: ltr;
    -webkit-appearance: none;
    width: 100%;
    height: 10px;
    border-radius: 5px;
    background: linear-gradient(
      to right,
      var(--highlight) 0%,
      var(--highlight) var(--seek-percent),
      var(--panel-color) var(--seek-percent),
      var(--panel-color) 100%
    );
    cursor: pointer;
    transition: height var(--transition);
    box-shadow: inset 2px 2px 5px var(--shadow-dark), inset -2px -2px 5px var(--shadow-light);
  }
  #seekBar:hover {
    height: 12px;
  }
  #seekBar::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: var(--highlight);
    border: 2px solid var(--text-color);
    border-radius: 50%;
    cursor: pointer;
    transition: transform var(--transition), background var(--transition);
    box-shadow: 2px 2px 5px var(--shadow-dark), -2px -2px 5px var(--shadow-light);
    margin-top: -5px; 
  }
  #seekBar:hover::-webkit-slider-thumb {
    transform: scale(1.2);
  }
  #seekBar::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: var(--highlight);
    border: 2px solid var(--text-color);
    border-radius: 50%;
    cursor: pointer;
    transition: transform var(--transition), background var(--transition);
    box-shadow: 2px 2px 5px var(--shadow-dark), -2px -2px 5px var(--shadow-light);
    margin-top: -5px;
  }
  #seekBar:hover::-moz-range-thumb {
    transform: scale(1.2);
  }
  #seekBar::-moz-range-track {
    background: var(--panel-color);
    height: 10px;
    border-radius: 5px;
    box-shadow: inset 2px 2px 5px var(--shadow-dark), inset -2px -2px 5px var(--shadow-light);
  }
  #seekBar::-moz-range-progress {
    background: var(--highlight);
    height: 10px;
    border-radius: 5px;
  }

  .volume-row {
    display: flex;
    align-items: center;
    gap: 1rem;
    width: 100%;
    margin-bottom: 2rem;
  }
  .volume-row svg {
    fill: var(--highlight);
    width: 24px;
    height: 24px;
    transition: fill var(--transition), transform var(--transition);
    cursor: pointer;
  }
  .volume-row svg:hover {
    transform: scale(1.1);
    fill: #ffe66c;
  }
  #volumeBar {
    direction: ltr;
    -webkit-appearance: none;
    width: 100%;
    height: 8px;
    border-radius: 4px;
    background: linear-gradient(
      to right,
      var(--highlight) 0%,
      var(--highlight) var(--volume-percent),
      var(--panel-color) var(--volume-percent),
      var(--panel-color) 100%
    );
    cursor: pointer;
    transition: height var(--transition);
    box-shadow: inset 2px 2px 5px var(--shadow-dark), inset -2px -2px 5px var(--shadow-light);
  }
  .volume-row:hover #volumeBar {
    height: 10px;
  }
  #volumeBar::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    background: var(--highlight);
    border: 2px solid var(--text-color);
    border-radius: 50%;
    cursor: pointer;
    transition: transform var(--transition), background var(--transition);
    box-shadow: 2px 2px 5px var(--shadow-dark), -2px -2px 5px var(--shadow-light);
    margin-top: -6px;
  }
  .volume-row:hover #volumeBar::-webkit-slider-thumb {
    transform: scale(1.2);
  }
  #volumeBar::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: var(--highlight);
    border: 2px solid var(--text-color);
    border-radius: 50%;
    cursor: pointer;
    transition: transform var(--transition), background var(--transition);
    box-shadow: 2px 2px 5px var(--shadow-dark), -2px -2px 5px var(--shadow-light);
    margin-top: -6px;
  }
  .volume-row:hover #volumeBar::-moz-range-thumb {
    transform: scale(1.2);
  }
  #volumeBar::-moz-range-track {
    background: var(--panel-color);
    height: 8px;
    border-radius: 4px;
    box-shadow: inset 2px 2px 5px var(--shadow-dark), inset -2px -2px 5px var(--shadow-light);
  }
  #volumeBar::-moz-range-progress {
    background: var(--highlight);
    height: 8px;
    border-radius: 4px;
  }
  @media (max-width: 900px) {
    .container {
      max-width: 100vw;
      padding: 0 0.7rem;
    }
  }
  @media (max-width: 700px) {
    .content-wrapper {
      flex-direction: column;
      gap: 2rem;
    }
    .dashboard {
      width: 100%;
    }
    .player-container {
      margin: 2rem 1rem;
      padding: 2rem 1rem;
    }
    .player-title {
      font-size: 1.4rem;
      margin-bottom: 1.5rem;
    }
    .play-btn {
      width: 50px;
      height: 50px;
    }
    .controls-row {
      gap: 1rem;
    }
    .time-display {
      font-size: 0.9rem;
      min-width: 4.5rem;
    }
    #seekBar {
      height: 6px;
    }
    #seekBar:hover {
      height: 8px;
    }
    #seekBar::-webkit-slider-thumb {
      width: 14px;
      height: 14px;
      margin-top: -4px;
    }
    .volume-row {
      gap: 0.8rem;
    }
    #volumeBar {
      height: 6px;
    }
    #volumeBar:hover {
      height: 8px;
    }
    #volumeBar::-webkit-slider-thumb {
      width: 16px;
      height: 16px;
      margin-top: -5px;
    }
    .back-btn {
      padding: 0.5em 1.4em;
      font-size: 0.95rem;
    }
  }
  @media (max-width: 430px) {
    .controls-row {
      flex-direction: column;
      gap: 1rem;
    }
    .time-display {
      font-size: 0.85rem;
      min-width: 4rem;
    }
    .search-box {
      max-width: 95vw;
      padding: 0.23em 0.3em;
    }
    .popup-content {
      padding: 1.4rem 1.6rem;
    }
    .popup-content h3 {
      font-size: 1.1rem;
      margin-bottom: 0.8rem;
    }
    .popup-content form input[type="email"],
    .popup-content form input[type="password"] {
      padding: 0.7em 0.9em;
      font-size: 0.95rem;
    }
    .popup-content form button.confirm-btn {
      padding: 0.75em 0;
      font-size: 0.95rem;
    }
  }
  @keyframes fadeInPanel {
    from {
      opacity: 0;
      transform: translateY(20px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }  
@media (max-width: 768px) {
  .burger-btn { display: flex; }
  nav {
    position: fixed; top: 0; left: -100%;
    flex-direction: column; width: 70%; height: 100%;
    padding: 4rem 1.5rem; background: var(--panel-color);
    gap: 2rem; transition: left var(--transition);
    box-shadow: 2px 0 8px var(--shadow-dark); z-index: 1000;
  }
  nav.open { left: 0; }
  nav a { font-size: 1.3rem; }
}

@media (max-width: 600px) {
  .search-box {
    max-width: 100%;
    padding: 0.4em;
  }
  .search-box input { font-size: 1rem; }
  .search-box button { width: 36px; height: 36px; }
}

@media (max-width: 500px) {
  .playlist-row {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  .playlist-card img { height: 150px; }
}

@media (max-width: 430px) {
  .auth-form { width: 90%; }
  .popup-content { padding: 1.4rem 1.6rem; }
  .popup-content h3 { font-size: 1.1rem; margin-bottom: 0.8rem; }
  .popup-content input { padding: 0.7em 0.9em; font-size: 0.95rem; }
  .confirm-btn { padding: 0.75em 0; font-size: 0.95rem; }
}

@media (max-width: 700px) {
  .player-container { width: 95%; padding: 1.5rem; }
  .controls-row { flex-direction: column; gap: 1rem; }
  .seek-row, .volume-row { flex-direction: column; }
}

/* ===========================
   Banner Section (responsive)
   =========================== */
   .banner {
    margin: 2rem auto;            /* فاصله از بالا و پایین */
    max-width: 100%;
    overflow: hidden;
    border-radius: var(--border-radius);
    box-shadow: 2px 2px 10px var(--shadow-dark), -2px -2px 10px var(--shadow-light);
  }
  
  .banner img {
    display: block;
    width: 100%;
    height: auto;
    object-fit: cover;
    transition: transform var(--transition);
  }
  
  .banner:hover img {
    transform: scale(1.02);
  }
  
  /* اگر خواستید در موبایل حاشیه‌ها کمتر باشد */
  @media (max-width: 600px) {
    .banner {
      margin: 1rem 0;
    }
  }