/* Zig Task Manager - Modern Dark Theme with Auth */

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

:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: #1a1a24;
    --bg-hover: #22222e;
    
    --accent-primary: #f7931a;
    --accent-secondary: #ff6b35;
    --accent-glow: rgba(247, 147, 26, 0.3);
    
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --text-muted: #606070;
    
    --success: #00d68f;
    --danger: #ff4757;
    
    --border-radius: 16px;
    --border-radius-sm: 8px;
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    
    --shadow-glow: 0 0 40px var(--accent-glow);
    --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    background-image: 
        radial-gradient(ellipse at top, rgba(247, 147, 26, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at bottom right, rgba(255, 107, 53, 0.05) 0%, transparent 50%);
}

/* Navbar */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background: rgba(18, 18, 26, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-logo {
    font-size: 1.5rem;
}

.nav-title {
    font-size: 1.25rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.nav-auth {
    display: flex;
    gap: 0.75rem;
}

.btn-nav {
    padding: 0.5rem 1rem;
    background: transparent;
    border: 1px solid var(--text-muted);
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition);
}

.btn-nav:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.btn-nav.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border: none;
}

.btn-nav.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

/* User Dropdown */
.nav-user.hidden { display: none; }

.user-dropdown { position: relative; }

.user-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
}

.user-btn:hover {
    border-color: var(--accent-primary);
}

.user-avatar {
    width: 28px;
    height: 28px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
}

.user-name { font-size: 0.875rem; }

.dropdown-arrow {
    font-size: 0.625rem;
    color: var(--text-muted);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 0.5rem;
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius-sm);
    min-width: 200px;
    box-shadow: var(--shadow-card);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition);
}

.user-dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-header {
    padding: 0.75rem 1rem;
}

.user-email {
    color: var(--text-muted);
    font-size: 0.75rem;
}

.dropdown-menu hr {
    border: none;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.dropdown-item {
    width: 100%;
    padding: 0.75rem 1rem;
    background: none;
    border: none;
    color: var(--text-primary);
    text-align: left;
    cursor: pointer;
    transition: var(--transition);
}

.dropdown-item:hover {
    background: var(--bg-hover);
    color: var(--danger);
}

/* Modal */
.modal {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

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

.modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
}

.modal-content {
    position: relative;
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: 2rem;
    width: 90%;
    max-width: 400px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: var(--shadow-card);
    transform: translateY(20px);
    transition: var(--transition);
}

.modal.active .modal-content {
    transform: translateY(0);
}

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

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

.modal-content h2 {
    margin-bottom: 1.5rem;
    text-align: center;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.form-group input {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--bg-secondary);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-error {
    color: var(--danger);
    font-size: 0.875rem;
    margin-bottom: 1rem;
    min-height: 1.25rem;
}

.btn-submit {
    width: 100%;
    padding: 0.875rem;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border: none;
    border-radius: var(--border-radius-sm);
    color: white;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.modal-footer {
    margin-top: 1.5rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.875rem;
}

.modal-footer a {
    color: var(--accent-primary);
    text-decoration: none;
}

.modal-footer a:hover { text-decoration: underline; }

/* App Container */
.app-container {
    max-width: 600px;
    margin: 0 auto;
    padding: 2rem;
    animation: fadeInUp 0.6s ease-out;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.header { text-align: center; margin-bottom: 2rem; }

.subtitle {
    color: var(--text-muted);
    font-size: 0.75rem;
    letter-spacing: 0.15em;
}

/* Main */
.main {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow-card);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

/* Form */
.task-form { 
    margin-bottom: 1.5rem; 
    width: 100%;
}

.input-group { 
    display: flex; 
    gap: 0.75rem; 
    flex-wrap: wrap;
    align-items: stretch;
}

.task-input {
    flex: 1 1 200px;
    min-width: 0;
    padding: 0.875rem 1rem;
    background: var(--bg-secondary);
    border: 2px solid transparent;
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition);
}

.task-input::placeholder { color: var(--text-muted); }

.task-input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 4px var(--accent-glow);
}

.btn-add {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    padding: 0.875rem 1.25rem;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border: none;
    border-radius: var(--border-radius-sm);
    color: white;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
    flex-shrink: 0;
}

.btn-add:hover { transform: translateY(-2px); box-shadow: var(--shadow-glow); }
.btn-add:active { transform: translateY(0); }
.btn-icon { font-size: 1.1rem; font-weight: 700; }

/* Responsive adjustments */
@media (max-width: 600px) {
    .input-group {
        flex-direction: column;
    }
    
    .task-input {
        flex: 1 1 100%;
    }
    
    .date-picker-wrapper {
        flex: 1 1 100%;
        justify-content: flex-start;
    }
    
    .btn-add {
        width: 100%;
        padding: 1rem;
    }
    
    .main {
        padding: 1rem;
    }
}

/* Stats */
.stats {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.stat { color: var(--text-secondary); font-size: 0.875rem; }
.stat span:first-child { color: var(--accent-primary); font-weight: 700; font-size: 1.25rem; }

/* Task List */
.task-list { list-style: none; display: flex; flex-direction: column; gap: 0.75rem; }

.task-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.25rem;
    background: var(--bg-secondary);
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateX(-20px); }
    to { opacity: 1; transform: translateX(0); }
}

.task-item:hover { background: var(--bg-hover); }

.task-checkbox {
    appearance: none;
    width: 24px;
    height: 24px;
    border: 2px solid var(--text-muted);
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    flex-shrink: 0;
}

.task-checkbox:hover { border-color: var(--accent-primary); }

.task-checkbox:checked { background: var(--success); border-color: var(--success); }

.task-checkbox:checked::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 14px;
    font-weight: bold;
}

.task-title {
    flex: 1;
    font-size: 1rem;
    color: var(--text-primary);
    transition: var(--transition);
}

.task-item.completed .task-title {
    color: var(--text-muted);
    text-decoration: line-through;
}

.btn-delete {
    padding: 0.5rem;
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.25rem;
    cursor: pointer;
    transition: var(--transition);
    opacity: 0;
    border-radius: 4px;
}

.task-item:hover .btn-delete { opacity: 1; }
.btn-delete:hover { color: var(--danger); background: rgba(255, 71, 87, 0.1); }

/* Empty State */
.empty-state {
    display: none;
    flex-direction: column;
    align-items: center;
    padding: 3rem;
    color: var(--text-muted);
}

.empty-state.visible { display: flex; }
.empty-icon { font-size: 3rem; margin-bottom: 1rem; opacity: 0.5; }

/* Footer */
.footer { text-align: center; margin-top: 2rem; color: var(--text-muted); font-size: 0.875rem; }
.heart { color: var(--accent-primary); }
.tech { font-size: 0.75rem; margin-top: 0.25rem; opacity: 0.6; }

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

/* Responsive */
@media (max-width: 480px) {
    .navbar { padding: 1rem; }
    .app-container { padding: 1rem; }
    .main { padding: 1.5rem; }
    .input-group { flex-direction: column; }
    .btn-add { justify-content: center; }
}

/* Profile Modal */
.modal-lg { max-width: 500px; }

.modal-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
    text-align: center;
}

.profile-header {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--border-radius-sm);
    margin-bottom: 1.5rem;
}

.profile-avatar {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    flex-shrink: 0;
}

.profile-info { flex: 1; }

.profile-name {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.profile-email {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.profile-badge { margin-top: 0.5rem; }

.badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 500;
}

.badge-success {
    background: rgba(0, 214, 143, 0.15);
    color: var(--success);
}

.badge-warning {
    background: rgba(255, 165, 0, 0.15);
    color: orange;
}

/* Profile Tabs */
.profile-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding-bottom: 0.5rem;
}

.tab-btn {
    padding: 0.5rem 1rem;
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition);
    border-radius: var(--border-radius-sm);
}

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

.tab-btn.active {
    color: var(--accent-primary);
    background: rgba(247, 147, 26, 0.1);
}

.tab-content { display: none; }
.tab-content.active { display: block; }

/* Form Success Message */
.form-success {
    color: var(--success);
    font-size: 0.875rem;
    margin-bottom: 1rem;
    padding: 0.75rem;
    background: rgba(0, 214, 143, 0.1);
    border-radius: var(--border-radius-sm);
    text-align: center;
}

.form-success.hidden { display: none; }

/* 6-Digit Verification Code Input */
.code-input-group {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    margin: 1.5rem 0;
}

.code-input {
    width: 48px;
    height: 56px;
    text-align: center;
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--bg-secondary);
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    transition: var(--transition);
}

.code-input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.code-input.filled {
    border-color: var(--accent-primary);
}

/* Dropdown profile item */
.dropdown-item:first-of-type:hover {
    color: var(--accent-primary);
    background: rgba(247, 147, 26, 0.1);
}

/* Completed Tasks Section */
.completed-section {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.section-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.task-list-completed .task-item {
    opacity: 0.7;
    background: rgba(0, 214, 143, 0.05);
    border-color: rgba(0, 214, 143, 0.2);
}

.task-list-completed .task-title {
    text-decoration: line-through;
    color: var(--text-muted);
}

/* Custom Date Picker Wrapper */
.date-picker-wrapper {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--bg-card);
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius-sm);
    padding: 0.4rem 0.6rem;
    transition: var(--transition);
    position: relative;
}

.date-picker-wrapper:hover {
    border-color: rgba(255, 255, 255, 0.2);
}

.date-picker-wrapper:focus-within {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-glow);
}

.date-picker-btn {
    background: transparent;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.3rem;
    border-radius: 4px;
    transition: var(--transition);
    opacity: 0.8;
}

.date-picker-btn:hover {
    background: rgba(247, 147, 26, 0.2);
    opacity: 1;
}

.hidden-input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
    pointer-events: none;
}

.date-preview {
    font-size: 0.85rem;
    color: var(--text-secondary);
    white-space: nowrap;
    min-width: 0;
}

.date-preview:empty::before {
    content: "No deadline";
    color: var(--text-muted);
    font-style: italic;
}

.date-preview.has-date {
    color: var(--accent-primary);
    font-weight: 500;
}

.date-clear-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.1rem;
    cursor: pointer;
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    transition: var(--transition);
    display: none;
}

.date-clear-btn:hover {
    background: rgba(255, 71, 87, 0.2);
    color: var(--danger);
}

.date-picker-wrapper.has-date .date-clear-btn {
    display: block;
}

/* Hidden native input but accessible by click */
.task-due-input.hidden-input {
    position: absolute;
    top: 100%;
    left: 0;
    opacity: 0;
    pointer-events: auto;
    width: 100%;
    height: 0;
}

/* Task Content with Dates */
.task-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
    min-width: 0;
}

.task-meta {
    display: flex;
    gap: 1rem;
    font-size: 0.75rem;
    color: var(--text-muted);
    flex-wrap: wrap;
}

.task-created, .task-due {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.05);
}

.task-due {
    color: var(--accent-primary);
    background: rgba(247, 147, 26, 0.1);
}

/* Task item improvements */
.task-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1rem 1.25rem;
    background: var(--bg-card);
    border-radius: var(--border-radius-sm);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition);
    margin-bottom: 0.5rem;
}

.task-item:hover {
    background: var(--bg-hover);
    border-color: rgba(255, 255, 255, 0.1);
}

.task-checkbox {
    width: 20px;
    height: 20px;
    margin-top: 2px;
    accent-color: var(--accent-primary);
    cursor: pointer;
}

.btn-delete {
    background: transparent;
    border: none;
    padding: 0.4rem;
    cursor: pointer;
    opacity: 0.5;
    transition: opacity 0.2s;
    font-size: 1rem;
}

.btn-delete:hover {
    opacity: 1;
}