/* Core CSS - Premium, Modern Dark Mode, Glassmorphism */
:root {
    --bg-gradient: linear-gradient(135deg, #09090b 0%, #18181b 100%);
    --surface-color: rgba(24, 24, 27, 0.65);
    --surface-hover: rgba(39, 39, 42, 0.8);
    --primary-color: #0ea5e9; /* Light blue / cyan */
    --primary-glow: rgba(14, 165, 233, 0.5);
    --accent-color: #8b5cf6; /* Purple */
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --border-color: rgba(255, 255, 255, 0.08);
    --glass-blur: blur(12px);
    --error-color: #f43f5e;
    --success-color: #10b981;
}

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

body {
    background: var(--bg-gradient);
    background-attachment: fixed;
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
}

h1, h2, h3, h4, h5 {
    font-family: 'Outfit', sans-serif;
    letter-spacing: -0.03em;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: all 0.3s ease;
}

a:hover {
    color: var(--accent-color);
    text-shadow: 0 0 8px var(--primary-glow);
}

/* Glassmorphism Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 2rem;
    background: var(--surface-color);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    font-family: 'Outfit', sans-serif;
    font-size: 1.75rem;
    font-weight: 800;
    letter-spacing: 3px;
    background: linear-gradient(to right, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-transform: uppercase;
}

.app-header nav a {
    margin-left: 1.5rem;
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--text-secondary);
}
.app-header nav a:hover {
    color: var(--text-primary);
}

.app-content {
    padding: 3rem 1.5rem;
    max-width: 680px;
    margin: 0 auto;
}

/* Forms & Inputs */
.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
textarea {
    width: 100%;
    padding: 1rem 1.25rem;
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    background-color: rgba(0, 0, 0, 0.2);
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
    transition: all 0.3s ease;
}

input:focus, textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    background-color: rgba(14, 165, 233, 0.05);
    box-shadow: 0 0 0 4px rgba(14, 165, 233, 0.15);
}

textarea {
    min-height: 140px;
    resize: vertical;
}

#tasks-container input {
    margin-bottom: 0.5rem;
}

/* Premium Buttons */
button, .btn {
    display: inline-block;
    width: 100%;
    padding: 1rem 1.5rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    color: #fff;
    border: none;
    border-radius: 0.75rem;
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    cursor: pointer;
    text-align: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 15px rgba(14, 165, 233, 0.3);
}

button:hover, .btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(14, 165, 233, 0.4);
}

button:active, .btn:active {
    transform: translateY(1px);
    box-shadow: 0 2px 10px rgba(14, 165, 233, 0.3);
}

/* Alerts */
.alert {
    padding: 1.25rem;
    border-radius: 0.75rem;
    margin-bottom: 2rem;
    font-weight: 500;
    backdrop-filter: var(--glass-blur);
    animation: fadeInDown 0.4s ease-out;
}

.alert-error {
    background-color: rgba(244, 63, 94, 0.1);
    color: #fda4af;
    border: 1px solid rgba(244, 63, 94, 0.3);
}

.alert-success {
    background-color: rgba(16, 185, 129, 0.1);
    color: #6ee7b7;
    border: 1px solid rgba(16, 185, 129, 0.3);
}

/* Cards & Containers */
.auth-container, .setup-container, .dashboard-container {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 1.25rem;
    padding: 2.5rem;
    backdrop-filter: var(--glass-blur);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    animation: slideUp 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 2rem;
    transition: all 0.3s ease;
}

.card:hover {
    background: var(--surface-hover);
    border-color: rgba(255, 255, 255, 0.15);
    transform: translateY(-4px);
}

/* Task List */
.task-list li {
    padding: 1.25rem;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
    margin-bottom: 0.75rem;
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    transition: all 0.3s ease;
}

.task-list li:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.1);
}

/* Custom Checkbox Styling */
.task-list input[type="checkbox"], .xx-checkbox {
    appearance: none;
    -webkit-appearance: none;
    width: 1.5rem;
    height: 1.5rem;
    border: 2px solid var(--border-color);
    border-radius: 0.375rem;
    margin-right: 1.25rem;
    background-color: transparent;
    cursor: pointer;
    transition: all 0.2s ease;
    display: grid;
    place-content: center;
    flex-shrink: 0;
}

.task-list input[type="checkbox"]::before, .xx-checkbox::before {
    content: "";
    width: 0.8rem;
    height: 0.8rem;
    transform: scale(0);
    transition: 120ms transform ease-in-out;
    box-shadow: inset 1em 1em var(--text-primary);
    transform-origin: center;
    clip-path: polygon(14% 44%, 0 65%, 50% 100%, 100% 16%, 80% 0%, 43% 62%);
}

.task-list input[type="checkbox"]:checked, .xx-checkbox:checked {
    background-color: var(--success-color);
    border-color: var(--success-color);
}

.task-list input[type="checkbox"]:checked::before, .xx-checkbox:checked::before {
    transform: scale(1);
}

/* Photo Upload Button */
.photo-btn {
    display: inline-block;
    padding: 0.4rem 0.75rem;
    background: rgba(14, 165, 233, 0.15);
    color: var(--primary-color);
    border-radius: 0.5rem;
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    border: 1px solid rgba(14, 165, 233, 0.3);
    margin-left: auto;
}

.photo-btn:hover {
    background: var(--primary-color);
    color: #fff;
}

.photo-upload-label {
    margin-bottom: 0;
    margin-left: auto;
}

/* Animations */
@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

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

/* Shared Glassmorphism Card Style */
.profile-card {
    background: rgba(15, 15, 20, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 1rem;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: none;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}
.profile-card h3 {
    text-transform: uppercase;
    font-size: 1.15rem;
    letter-spacing: 1px;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    padding-bottom: 1rem;
    color: #fff;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.btn-red {
    background: linear-gradient(135deg, #f43f5e 0%, #be123c 100%);
    box-shadow: 0 4px 20px rgba(244, 63, 94, 0.4);
    color: white;
    border: none;
}
.btn-red:hover {
    box-shadow: 0 8px 25px rgba(244, 63, 94, 0.6);
}
.avatar-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 2.5rem;
}
#avatar-preview {
    border: 2px solid #f43f5e;
    box-shadow: 0 0 20px rgba(244, 63, 94, 0.3);
}
.profile-card input, .profile-card textarea {
    background: rgba(0, 0, 0, 0.3) !important;
    border-color: rgba(255, 255, 255, 0.1) !important;
}
.profile-card input:focus, .profile-card textarea:focus {
    border-color: #f43f5e !important;
    box-shadow: 0 0 0 4px rgba(244, 63, 94, 0.15) !important;
    background: rgba(244, 63, 94, 0.05) !important;
}
.btn-outline {
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text-secondary);
    box-shadow: none;
}
.btn-outline:hover {
    background: rgba(255,255,255,0.05);
    border-color: #fff;
    color: #fff;
    box-shadow: none;
}