:root {
    --bg-color: #0f111a;
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.08);
    --text-primary: #ffffff;
    --text-secondary: #94a3b8;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --error: #ef4444;
    --success: #10b981;
    --input-bg: rgba(0, 0, 0, 0.2);
    --ring: rgba(59, 130, 246, 0.5);
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    background-image: 
        radial-gradient(at 0% 0%, rgba(59, 130, 246, 0.15) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(16, 185, 129, 0.1) 0px, transparent 50%);
    background-attachment: fixed;
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 2rem 1rem;
    line-height: 1.5;
}

.hidden {
    display: none !important;
}

/* Glassmorphism Containers */
.glass-container {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
}

#login-section {
    width: 100%;
    max-width: 400px;
    margin-top: 10vh;
}

#login-section.active {
    display: block;
    animation: fadeIn 0.4s ease-out;
}

.container {
    width: 100%;
    max-width: 800px;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    animation: fadeIn 0.4s ease-out;
}

.header, .app-header {
    text-align: left;
    margin-bottom: 2rem;
}

.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0;
    padding: 1.5rem 2rem;
}

h1 {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, #fff 0%, #a5b4fc 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Forms */
form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

input, select, textarea {
    width: 100%;
    background: var(--input-bg);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    padding: 0.75rem 1rem;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    transition: all 0.2s ease;
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--ring);
}

input::placeholder, textarea::placeholder {
    color: #475569;
}

textarea {
    resize: vertical;
}

/* File Upload */
.file-upload {
    background: var(--input-bg);
    border: 1px dashed var(--glass-border);
    border-radius: 8px;
    padding: 1rem;
    text-align: center;
    position: relative;
    transition: all 0.2s;
    cursor: pointer;
}

.file-upload:hover {
    border-color: var(--text-secondary);
}

.file-upload input[type="file"] {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
}

.preview {
    margin-top: 0.5rem;
    font-size: 0.85rem;
    color: var(--accent);
    word-break: break-all;
}

.preview img {
    max-width: 100%;
    max-height: 120px;
    border-radius: 4px;
    margin-top: 0.5rem;
    display: block;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
    position: relative;
}

.btn.primary {
    background: var(--accent);
    color: white;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.25);
}

.btn.primary:hover:not(:disabled) {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

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

.btn.secondary:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.1);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

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

/* Spinner */
.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 0.8s linear infinite;
    position: absolute;
}

.btn.loading span {
    opacity: 0;
}

.btn.loading .spinner {
    display: block !important;
}

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

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

/* Toast */
#toast-container {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    z-index: 1000;
}

.toast {
    background: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(8px);
    border: 1px solid var(--glass-border);
    color: white;
    padding: 1rem 1.25rem;
    border-radius: 8px;
    font-size: 0.9rem;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
    animation: slideIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.toast.success { border-left: 4px solid var(--success); }
.toast.error { border-left: 4px solid var(--error); }

@keyframes slideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* Responsive */
@media (max-width: 640px) {
    .grid-2 {
        grid-template-columns: 1fr;
    }
    
    .app-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    
    #toast-container {
        bottom: 1rem;
        right: 1rem;
        left: 1rem;
    }
}