/* Base Styles and Theme Variables */
:root {
    /* Light Theme Colors */
    --light-bg: #f5f5f5;
    --light-surface: #ffffff;
    --light-text: #333333;
    --light-text-secondary: #666666;
    --light-border: #e0e0e0;
    --light-accent: #4285f4;
    --light-accent-hover: #3367d6;
    --light-danger: #ea4335;
    --light-success: #34a853;
    --light-input-bg: #f8f8f8;
    
    /* Dark Theme Colors */
    --dark-bg: #121212;
    --dark-surface: #1e1e1e;
    --dark-text: #f5f5f5;
    --dark-text-secondary: #b0b0b0;
    --dark-border: #333333;
    --dark-accent: #4285f4;
    --dark-accent-hover: #5c9aff;
    --dark-danger: #ff6b6b;
    --dark-success: #4cd964;
    --dark-input-bg: #2a2a2a;
}

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

body {
    font-family: 'Poppins', sans-serif;
    transition: background-color 0.3s ease, color 0.3s ease;
    min-height: 100vh;
    padding-bottom: 20px;
}

/* Theme Classes */
body.light-theme {
    background-color: var(--light-bg);
    color: var(--light-text);
}

body.dark-theme {
    background-color: var(--dark-bg);
    color: var(--dark-text);
}

/* Theme Toggle */
.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 100;
}

.theme-toggle button {
    background: transparent;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    width: 45px;
    height: 45px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.light-theme .theme-toggle button {
    color: var(--light-text);
    background-color: var(--light-surface);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.dark-theme .theme-toggle button {
    color: var(--dark-text);
    background-color: var(--dark-surface);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
}

.light-theme .theme-toggle button:hover {
    background-color: var(--light-bg);
}

.dark-theme .theme-toggle button:hover {
    background-color: #2a2a2a;
}

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    padding-top: 70px;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 30px;
}

h1 {
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 10px;
}

.subtitle {
    font-size: 1.1rem;
    color: var(--light-text-secondary);
}

.dark-theme .subtitle {
    color: var(--dark-text-secondary);
}

/* App Container */
.app-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

/* Drop Area */
#drop-area {
    padding: 40px 20px;
    border-radius: 12px;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
}

.light-theme #drop-area {
    background-color: var(--light-surface);
    border: 2px dashed var(--light-border);
}

.dark-theme #drop-area {
    background-color: var(--dark-surface);
    border: 2px dashed var(--dark-border);
}

#drop-area:hover {
    transform: translateY(-2px);
}

.light-theme #drop-area:hover {
    border-color: var(--light-accent);
}

.dark-theme #drop-area:hover {
    border-color: var(--dark-accent);
}

.drop-area.dragover {
    background-color: rgba(66, 133, 244, 0.1);
}

.drop-icon {
    font-size: 3rem;
    margin-bottom: 15px;
}

.light-theme .drop-icon {
    color: var(--light-accent);
}

.dark-theme .drop-icon {
    color: var(--dark-accent);
}

#drop-area p {
    margin-bottom: 10px;
    font-size: 1.1rem;
}

#drop-area p.small {
    font-size: 0.9rem;
    opacity: 0.7;
}

.browse-btn {
    padding: 10px 20px;
    border-radius: 6px;
    border: none;
    font-family: 'Poppins', sans-serif;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    z-index: 10;
}

.light-theme .browse-btn {
    background-color: var(--light-input-bg);
    color: var(--light-text);
}

.dark-theme .browse-btn {
    background-color: var(--dark-input-bg);
    color: var(--dark-text);
}

.browse-btn:hover {
    transform: translateY(-2px);
}

.light-theme .browse-btn:hover {
    background-color: var(--light-border);
}

.dark-theme .browse-btn:hover {
    background-color: #3a3a3a;
}

#fileInput {
    display: none;
}

/* Settings Panel */
.settings-panel {
    border-radius: 12px;
    padding: 25px;
}

.light-theme .settings-panel {
    background-color: var(--light-surface);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.dark-theme .settings-panel {
    background-color: var(--dark-surface);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.settings-panel h2 {
    margin-bottom: 20px;
    font-size: 1.5rem;
}

.setting-group {
    margin-bottom: 20px;
}

.setting-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
}

.input-with-select {
    display: flex;
}

input, select {
    font-family: 'Poppins', sans-serif;
    padding: 12px;
    border-radius: 6px;
    border: none;
    font-size: 1rem;
    transition: all 0.3s ease;
    width: 100%;
}

.light-theme input, .light-theme select {
    background-color: var(--light-input-bg);
    color: var(--light-text);
    border: 1px solid var(--light-border);
}

.dark-theme input, .dark-theme select {
    background-color: var(--dark-input-bg);
    color: var(--dark-text);
    border: 1px solid var(--dark-border);
}

input:focus, select:focus {
    outline: none;
}

.light-theme input:focus, .light-theme select:focus {
    border-color: var(--light-accent);
    box-shadow: 0 0 0 2px rgba(66, 133, 244, 0.2);
}

.dark-theme input:focus, .dark-theme select:focus {
    border-color: var(--dark-accent);
    box-shadow: 0 0 0 2px rgba(66, 133, 244, 0.2);
}

input[type="number"] {
    flex: 1;
    border-top-right-radius: 0;
    border-bottom-right-radius: 0;
}

.input-with-select select {
    width: 100px;
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
}

.light-theme .input-with-select select {
    border-left: none;
}

.dark-theme .input-with-select select {
    border-left: none;
}

/* Buttons */
button {
    font-family: 'Poppins', sans-serif;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.primary-btn {
    width: 100%;
    padding: 14px;
    border-radius: 6px;
    border: none;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.light-theme .primary-btn {
    background-color: var(--light-accent);
    color: white;
}

.dark-theme .primary-btn {
    background-color: var(--dark-accent);
    color: white;
}

.primary-btn:hover {
    transform: translateY(-2px);
}

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

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

.download-btn {
    margin-top: 15px;
}

/* Progress Container */
#progressContainer {
    border-radius: 12px;
    padding: 25px;
    margin-top: 10px;
}

.light-theme #progressContainer {
    background-color: var(--light-surface);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.dark-theme #progressContainer {
    background-color: var(--dark-surface);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

#progressContainer h3 {
    margin-bottom: 15px;
}

.progress-wrapper {
    position: relative;
    margin-bottom: 15px;
}

progress {
    width: 100%;
    height: 10px;
    border-radius: 5px;
    overflow: hidden;
    border: none;
}

.light-theme progress {
    background-color: var(--light-input-bg);
}

.light-theme progress::-webkit-progress-bar {
    background-color: var(--light-input-bg);
    border-radius: 5px;
}

.light-theme progress::-webkit-progress-value {
    background-color: var(--light-accent);
    border-radius: 5px;
}

.light-theme progress::-moz-progress-bar {
    background-color: var(--light-accent);
    border-radius: 5px;
}

.dark-theme progress {
    background-color: var(--dark-input-bg);
}

.dark-theme progress::-webkit-progress-bar {
    background-color: var(--dark-input-bg);
    border-radius: 5px;
}

.dark-theme progress::-webkit-progress-value {
    background-color: var(--dark-accent);
    border-radius: 5px;
}

.dark-theme progress::-moz-progress-bar {
    background-color: var(--dark-accent);
    border-radius: 5px;
}

#progressPercentage {
    position: absolute;
    right: 0;
    top: -25px;
    font-weight: 500;
}

/* Files Section */
.files-section {
    border-radius: 12px;
    padding: 25px;
}

.light-theme .files-section {
    background-color: var(--light-surface);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.dark-theme .files-section {
    background-color: var(--dark-surface);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.files-section h2 {
    margin-bottom: 20px;
    font-size: 1.5rem;
}

.files-list {
    list-style-type: none;
    max-height: 300px;
    overflow-y: auto;
    padding-right: 10px;
}

.files-list li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid;
}

.light-theme .files-list li {
    border-color: var(--light-border);
}

.dark-theme .files-list li {
    border-color: var(--dark-border);
}

.file-info {
    display: flex;
    align-items: center;
    gap: 10px;
    flex: 1;
    overflow: hidden;
}

.file-number {
    font-weight: 500;
    flex-shrink: 0;
}

.file-name {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.file-name a {
    text-decoration: none;
    transition: color 0.3s ease;
}

.light-theme .file-name a {
    color: var(--light-accent);
}

.dark-theme .file-name a {
    color: var(--dark-accent);
}

.file-name a:hover {
    text-decoration: underline;
}

.file-actions {
    display: flex;
    gap: 10px;
    flex-shrink: 0;
}

.remove-btn {
    background: none;
    border: none;
    font-size: 1rem;
    width: 35px;
    height: 35px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.light-theme .remove-btn {
    color: var(--light-danger);
    background-color: rgba(234, 67, 53, 0.1);
}

.dark-theme .remove-btn {
    color: var(--dark-danger);
    background-color: rgba(255, 107, 107, 0.1);
}

.light-theme .remove-btn:hover {
    background-color: rgba(234, 67, 53, 0.2);
}

.dark-theme .remove-btn:hover {
    background-color: rgba(255, 107, 107, 0.2);
}

.empty-list {
    text-align: center;
    padding: 20px;
    color: var(--light-text-secondary);
}

.dark-theme .empty-list {
    color: var(--dark-text-secondary);
}

/* Responsive Styles */
@media (min-width: 768px) {
    .app-container {
        grid-template-columns: repeat(2, 1fr);
        grid-template-rows: auto auto auto;
    }
    
    #drop-area {
        grid-column: 1 / -1;
        grid-row: 1;
    }
    
    .settings-panel {
        grid-column: 1;
        grid-row: 2;
    }
    
    .files-section {
        grid-column: 2;
        grid-row: 2 / span 2;
        height: 100%;
    }
    
    #progressContainer {
        grid-column: 1;
        grid-row: 3;
    }
    
    #downloadContainer {
        grid-column: 1 / -1;
        grid-row: 4;
    }
}

@media (max-width: 767px) {
    body {
        padding-top: 10px;
    }

    .container {
        padding: 15px;
        padding-top: 60px;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    .theme-toggle {
        top: 10px;
        right: 10px;
    }
    
    .theme-toggle button {
        width: 40px;
        height: 40px;
        font-size: 1.2rem;
    }
    
    #drop-area {
        padding: 30px 15px;
    }
    
    .drop-icon {
        font-size: 2.5rem;
    }
    
    .settings-panel,
    .files-section,
    #progressContainer {
        padding: 20px;
    }
    
    .files-list {
        max-height: 200px;
    }
    
    .primary-btn {
        padding: 12px;
    }
    
    .setting-group {
        margin-bottom: 15px;
    }
    
    input, select {
        padding: 10px;
    }
    
    .file-info {
        flex-direction: column;
        align-items: flex-start;
        gap: 5px;
    }
    
    .file-name {
        width: 100%;
    }
}

/* Custom scrollbar */
.files-list::-webkit-scrollbar {
    width: 8px;
}

.light-theme .files-list::-webkit-scrollbar-track {
    background: var(--light-input-bg);
    border-radius: 10px;
}

.light-theme .files-list::-webkit-scrollbar-thumb {
    background: var(--light-border);
    border-radius: 10px;
}

.light-theme .files-list::-webkit-scrollbar-thumb:hover {
    background: var(--light-text-secondary);
}

.dark-theme .files-list::-webkit-scrollbar-track {
    background: var(--dark-input-bg);
    border-radius: 10px;
}

.dark-theme .files-list::-webkit-scrollbar-thumb {
    background: var(--dark-border);
    border-radius: 10px;
}

.dark-theme .files-list::-webkit-scrollbar-thumb:hover {
    background: var(--dark-text-secondary);
}

/* Format Select Full Width */
#format-select {
    width: 100%;
}