:root {
    --bg-primary: #0a0a0c;
    --bg-secondary: #121217;
    --bg-glass: rgba(255, 255, 255, 0.03);
    --bg-glass-hover: rgba(255, 255, 255, 0.08);
    --border-glass: rgba(255, 255, 255, 0.08);
    
    --text-primary: #f8f9fa;
    --text-secondary: #a0a0ab;
    --text-muted: #6c6c77;
    
    --accent: #5e6ad2;
    --accent-hover: #7380f3;
    --accent-glow: rgba(94, 106, 210, 0.3);
    
    --danger: #e24c4c;
    --danger-hover: #fa5c5c;
    
    --success: #34d399;
    
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    
    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* Background gradient effects */
body::before, body::after {
    content: '';
    position: fixed;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    filter: blur(120px);
    z-index: -1;
    opacity: 0.15;
    pointer-events: none;
}

body::before {
    background: var(--accent);
    top: -200px;
    left: -200px;
}

body::after {
    background: #a855f7;
    bottom: -200px;
    right: -200px;
}

/* Typography */
h1 { font-size: 1.5rem; font-weight: 600; letter-spacing: -0.02em; }
h2 { font-size: 1.25rem; font-weight: 600; margin-bottom: 0.5rem; }
p { color: var(--text-secondary); font-size: 0.95rem; }

/* Utilities */
.hidden { display: none !important; }

/* Glassmorphism */
.glass-panel, .glass-card {
    background: var(--bg-glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-glass);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.glass-card {
    border-radius: var(--radius-lg);
    padding: 2rem;
}

.glass-panel {
    border-radius: var(--radius-md);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 500;
    padding: 0.6rem 1.2rem;
    border-radius: var(--radius-sm);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    white-space: nowrap;
}

.primary-btn {
    background: var(--accent);
    color: white;
    box-shadow: 0 4px 12px var(--accent-glow);
}

.primary-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 6px 16px var(--accent-glow);
}

.primary-btn:active {
    transform: translateY(0);
}

.ghost-btn {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-glass);
}

.ghost-btn:hover {
    background: var(--bg-glass-hover);
    color: var(--text-primary);
}

.icon-btn {
    padding: 0.5rem;
    background: transparent;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
}

.icon-btn:hover {
    background: var(--bg-glass-hover);
    color: var(--text-primary);
}

.icon-btn.danger:hover {
    color: var(--danger);
    background: rgba(226, 76, 76, 0.1);
}

/* Forms */
.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.input-group {
    margin-bottom: 1.25rem;
}

.input-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

input[type="text"],
input[type="password"],
input[type="number"],
select,
textarea {
    width: 100%;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-glass);
    border-radius: var(--radius-sm);
    padding: 0.75rem 1rem;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    transition: var(--transition);
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-glow);
    background: rgba(0, 0, 0, 0.4);
}

textarea {
    resize: vertical;
    min-height: 80px;
}

select {
    appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23a0a0ab' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 1em;
}

select option {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1.25rem;
    cursor: pointer;
}

.checkbox-group input[type="checkbox"] {
    width: 1rem;
    height: 1rem;
    accent-color: var(--accent);
    cursor: pointer;
}

.checkbox-group label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    cursor: pointer;
    user-select: none;
}

/* File Upload Area */
.file-upload-area {
    border: 1px dashed var(--border-glass);
    border-radius: var(--radius-md);
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    background: rgba(0, 0, 0, 0.15);
    margin-bottom: 1.5rem;
}

.file-upload-area:hover, .file-upload-area.dragover {
    border-color: var(--accent);
    background: rgba(94, 106, 210, 0.05);
}

.file-upload-area svg {
    color: var(--text-secondary);
}

.file-upload-area.has-file {
    border-color: var(--success);
    background: rgba(52, 211, 153, 0.05);
}
.file-upload-area.has-file svg {
    color: var(--success);
}

/* Layout */
.app-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 2rem;
    animation: fadeIn 0.4s ease-out;
}

.app-header {
    margin-bottom: 2rem;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 2rem;
}

.header-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
}

/* Table */
.table-container {
    padding: 1rem 0;
    overflow-x: auto;
    position: relative;
    min-height: 300px;
}

.releases-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

.releases-table th, .releases-table td {
    padding: 1rem 2rem;
    border-bottom: 1px solid var(--border-glass);
    white-space: nowrap;
}

.releases-table th {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    font-weight: 600;
}

.releases-table tbody tr {
    transition: var(--transition);
}

.releases-table tbody tr:hover {
    background: var(--bg-glass-hover);
}

.releases-table tbody tr:last-child td {
    border-bottom: none;
}

.badge {
    display: inline-block;
    padding: 0.25rem 0.6rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 500;
    background: rgba(255, 255, 255, 0.1);
}

.badge.stable { background: rgba(52, 211, 153, 0.15); color: #34d399; }
.badge.beta { background: rgba(251, 191, 36, 0.15); color: #fbbf24; }
.badge.nightly { background: rgba(167, 139, 250, 0.15); color: #a78bfa; }

.actions-col {
    text-align: right;
}

.empty-state {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: var(--text-muted);
}

.empty-icon {
    margin-bottom: 1rem;
    opacity: 0.5;
}

/* Overlays & Modals */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.overlay.active {
    opacity: 1;
    visibility: visible;
}

.login-card {
    width: 100%;
    max-width: 400px;
    text-align: center;
    position: relative;
    overflow: hidden;
    transform: translateY(20px);
    transition: var(--transition);
}

.overlay.active .login-card {
    transform: translateY(0);
}

.login-card h2 { margin-bottom: 0.5rem; }
.login-card p { margin-bottom: 2rem; }
.login-card form { text-align: left; }
.login-card button { width: 100%; margin-top: 1rem; }

.upload-card {
    width: 100%;
    max-width: 550px;
    position: relative;
    transform: translateY(20px) scale(0.95);
    transition: var(--transition);
}

.overlay.active .upload-card {
    transform: translateY(0) scale(1);
}

.upload-card h2 { margin-bottom: 1.5rem; }

.close-btn {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    line-height: 1;
    transition: var(--transition);
}

.close-btn:hover {
    color: var(--text-primary);
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    margin-top: 1rem;
}

/* Loading state */
.loading-state {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-glass);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
}

.loading-state.active {
    opacity: 1;
    pointer-events: all;
}

.spinner {
    width: 24px;
    height: 24px;
    border: 2px solid rgba(255,255,255,0.1);
    border-radius: 50%;
    border-top-color: var(--accent);
    animation: spin 0.8s linear infinite;
}

.btn-spinner {
    width: 16px;
    height: 16px;
    border-width: 2px;
}

.error-text {
    color: var(--danger);
    font-size: 0.85rem;
    margin-top: 0.5rem;
    text-align: center;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--bg-secondary);
    border: 1px solid var(--border-glass);
    padding: 0.75rem 1.5rem;
    border-radius: 30px;
    font-size: 0.9rem;
    font-weight: 500;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.toast.show {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.toast.success { border-bottom: 2px solid var(--success); }
.toast.error { border-bottom: 2px solid var(--danger); }

/* Animations */
@keyframes spin {
    to { transform: rotate(360deg); }
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}