@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&family=Outfit:wght@400;600;800&display=swap');

/* Core CSS - Ultra Premium, Modern Dark Mode, Glassmorphism */
:root {
    --bg-base: #050505;
    --surface-color: rgba(20, 20, 24, 0.6);
    --surface-hover: rgba(32, 32, 38, 0.8);
    --primary-color: #00e5ff; /* Neon cyan */
    --primary-glow: rgba(0, 229, 255, 0.5);
    --accent-color: #9d00ff; /* Deep neon purple */
    --text-primary: #ffffff;
    --text-secondary: #a1a1aa;
    --border-color: rgba(255, 255, 255, 0.08);
    --glass-blur: blur(24px);
    --error-color: #ff2a5f;
    --success-color: #00e676;
    --glow-spread: 0 0 20px;
}

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

body {
    background-color: var(--bg-base);
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(157, 0, 255, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 85% 30%, rgba(0, 229, 255, 0.08) 0%, transparent 50%);
    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: -0.02em;
    margin-bottom: 1rem;
    color: var(--text-primary);
    font-weight: 600;
}

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

a:hover {
    color: #fff;
    text-shadow: var(--glow-spread) var(--primary-glow);
}

/* Glassmorphism Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 2.5rem;
    background: rgba(10, 10, 12, 0.6);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid rgba(255,255,255,0.05);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 4px 30px rgba(0,0,0,0.5);
}

.logo {
    font-family: 'Outfit', sans-serif;
    font-size: 1.8rem;
    font-weight: 800;
    letter-spacing: 4px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-transform: uppercase;
    position: relative;
    display: inline-block;
}

.logo::after {
    content: 'YFC';
    position: absolute;
    left: 0;
    top: 0;
    z-index: -1;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: blur(12px);
    opacity: 0.5;
}

.app-header nav a {
    margin-left: 2rem;
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
}
.app-header nav a:hover {
    color: var(--text-primary);
}

.app-content {
    padding: 4rem 1.5rem;
    max-width: 720px;
    margin: 0 auto;
}

/* Forms & Inputs */
.form-group {
    margin-bottom: 1.75rem;
}

label {
    display: block;
    margin-bottom: 0.6rem;
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
textarea, select {
    width: 100%;
    padding: 1.1rem 1.25rem;
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 0.75rem;
    background-color: rgba(0, 0, 0, 0.3);
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(10px);
}
select option {
    background-color: #111;
    color: #fff;
}

input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--primary-color);
    background-color: rgba(0, 229, 255, 0.03);
    box-shadow: 0 0 15px rgba(0, 229, 255, 0.2);
    transform: translateY(-2px);
}

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

#tasks-container input {
    margin-bottom: 0.75rem;
}

/* Premium Buttons */
button, .btn {
    display: inline-block;
    width: 100%;
    padding: 1.1rem 1.5rem;
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--primary-color) 100%);
    background-size: 200% auto;
    color: #fff;
    border: none;
    border-radius: 0.75rem;
    font-size: 1.05rem;
    font-weight: 600;
    font-family: 'Outfit', sans-serif;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    cursor: pointer;
    text-align: center;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 20px rgba(0, 229, 255, 0.2);
    position: relative;
    overflow: hidden;
}

button:hover, .btn:hover {
    background-position: right center;
    transform: translateY(-3px) scale(1.01);
    box-shadow: 0 10px 30px rgba(0, 229, 255, 0.4);
}

button:active, .btn:active {
    transform: translateY(1px);
    box-shadow: 0 2px 10px rgba(0, 229, 255, 0.2);
}

/* Alerts */
.alert {
    padding: 1.25rem 1.5rem;
    border-radius: 0.75rem;
    margin-bottom: 2.5rem;
    font-weight: 500;
    backdrop-filter: var(--glass-blur);
    animation: fadeInDown 0.5s cubic-bezier(0.16, 1, 0.3, 1);
    display: flex;
    align-items: center;
}

.alert-error {
    background-color: rgba(255, 42, 95, 0.1);
    color: #ff7396;
    border: 1px solid rgba(255, 42, 95, 0.3);
    box-shadow: 0 4px 20px rgba(255, 42, 95, 0.15);
}

.alert-success {
    background-color: rgba(0, 230, 118, 0.1);
    color: #69f0ae;
    border: 1px solid rgba(0, 230, 118, 0.3);
    box-shadow: 0 4px 20px rgba(0, 230, 118, 0.15);
}

/* Cards & Containers */
.auth-container, .setup-container, .dashboard-container {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-top: 1px solid rgba(255,255,255,0.15);
    border-left: 1px solid rgba(255,255,255,0.15);
    border-radius: 1.5rem;
    padding: 3rem;
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    box-shadow: 0 30px 60px -15px rgba(0, 0, 0, 0.6);
    animation: slideUp 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.card {
    background: rgba(20, 20, 25, 0.4);
    border: 1px solid rgba(255,255,255,0.05);
    border-radius: 1.25rem;
    padding: 2.5rem;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; height: 2px;
    background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.card:hover {
    background: var(--surface-hover);
    border-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0,0,0,0.3);
}

.card:hover::before {
    opacity: 1;
}

/* Task List */
.task-list {
    list-style: none;
}
.task-list li {
    padding: 1.25rem 1.5rem;
    background: rgba(0, 0, 0, 0.25);
    border: 1px solid rgba(255,255,255,0.05);
    margin-bottom: 1rem;
    border-radius: 1rem;
    display: flex;
    align-items: center;
    transition: all 0.3s ease;
}

.task-list li:hover {
    background: rgba(255, 255, 255, 0.03);
    border-color: rgba(255, 255, 255, 0.15);
    transform: scale(1.01);
}

/* Custom Checkbox Styling */
.task-list input[type="checkbox"], .xx-checkbox {
    appearance: none;
    -webkit-appearance: none;
    width: 1.75rem;
    height: 1.75rem;
    border: 2px solid rgba(255,255,255,0.2);
    border-radius: 0.5rem;
    margin-right: 1.5rem;
    background-color: rgba(0,0,0,0.3);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: grid;
    place-content: center;
    flex-shrink: 0;
}

.task-list input[type="checkbox"]::before, .xx-checkbox::before {
    content: "";
    width: 1rem;
    height: 1rem;
    transform: scale(0);
    transition: 0.3s transform cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: inset 1em 1em #000;
    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);
    box-shadow: 0 0 15px rgba(0, 230, 118, 0.4);
}

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

/* Photo Upload Button */
.photo-btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: rgba(0, 229, 255, 0.1);
    color: var(--primary-color);
    border-radius: 0.5rem;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
    transition: all 0.3s;
    border: 1px solid rgba(0, 229, 255, 0.3);
    margin-left: auto;
}

.photo-btn:hover {
    background: var(--primary-color);
    color: #000;
    box-shadow: 0 0 15px rgba(0, 229, 255, 0.4);
}

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

/* Animations */
@keyframes slideUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

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

/* Profile / Special Cards */
.profile-card {
    background: rgba(15, 15, 20, 0.7);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-top: 1px solid rgba(255,255,255,0.2);
    border-radius: 1.5rem;
    padding: 2.5rem;
    margin-bottom: 2.5rem;
    box-shadow: 0 20px 40px rgba(0,0,0,0.4);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}
.profile-card h3 {
    text-transform: uppercase;
    font-size: 1.25rem;
    letter-spacing: 2px;
    margin-bottom: 2rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding-bottom: 1.25rem;
    color: #fff;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.btn-red {
    background: linear-gradient(135deg, #ff2a5f 0%, #d80032 100%);
    box-shadow: 0 4px 20px rgba(255, 42, 95, 0.3);
    color: white;
    border: none;
}
.btn-red:hover {
    background-position: right center;
    box-shadow: 0 8px 30px rgba(255, 42, 95, 0.5);
}
.avatar-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 3rem;
}
#avatar-preview {
    border: 3px solid var(--primary-color);
    box-shadow: 0 0 25px rgba(0, 229, 255, 0.4);
    border-radius: 50%;
    transition: all 0.4s ease;
}
#avatar-preview:hover {
    transform: scale(1.05) rotate(2deg);
    box-shadow: 0 0 35px rgba(0, 229, 255, 0.6);
}
.profile-card input, .profile-card textarea {
    background: rgba(0, 0, 0, 0.4) !important;
    border-color: rgba(255, 255, 255, 0.1) !important;
}
.profile-card input:focus, .profile-card textarea:focus {
    border-color: var(--primary-color) !important;
    box-shadow: 0 0 0 4px rgba(0, 229, 255, 0.15) !important;
    background: rgba(0, 229, 255, 0.05) !important;
}
.btn-outline {
    background: transparent;
    border: 2px solid rgba(255, 255, 255, 0.2);
    color: var(--text-primary);
    box-shadow: none;
}
.btn-outline:hover {
    background: rgba(255,255,255,0.1);
    border-color: #fff;
    color: #fff;
    box-shadow: 0 0 15px rgba(255,255,255,0.2);
}