/* --- Root Variables for Theming --- */
:root {
    --bg-gradient: linear-gradient(135deg, #e0e7ff 0%, #f4f7f9 100%);
    --bg-color: #f4f7f9;
    --card-bg-color: rgba(255,255,255,0.85);
    --text-color: #22223b;
    --primary-color: #4f8cff;
    --primary-hover-color: #2563eb;
    --card-bg-color: #ffffff;
    --text-color: #333;
    --primary-color: #007bff;
    --logo-color: #007bff;
    --primary-hover-color: #0056b3;
    --secondary-color: #6c757d;
    --border-color: #e0e0e0;
    --shadow-color: rgba(80, 112, 255, 0.08);
    --completed-color: #999;
    --navbar-glass: rgba(255,255,255,0.7);
    --navbar-border: rgba(79,140,255,0.15);
    --accent: #e94560;
}

body.dark-theme {
    --bg-gradient: linear-gradient(135deg, #23243a 0%, #1a1a2e 100%);
    --logo-color:#ffffff;
    --bg-color: #1a1a2e;
    --card-bg-color: rgba(22,33,62,0.92);
    --text-color: #e0e0e0;
    --primary-color: #0f3460;
    --primary-hover-color: #e94560;
    --border-color: #2a3b5c;
    --shadow-color: rgba(0, 0, 0, 0.4);
    --navbar-glass: rgba(22,33,62,0.85);
    --navbar-border: rgba(233,69,96,0.15);
    --accent: #e94560;
}

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

body {
    font-family: 'Poppins', sans-serif;
    background: var(--bg-gradient);
    color: var(--text-color);
    min-height: 100vh;
    transition: background 0.5s, color 0.3s;
}
.container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 2rem;
}
/* --- Header & Navigation --- */
header {
    background: none;
    box-shadow: none;
    padding: 0;
    background-color: var(--card-bg-color);
    box-shadow: 0 2px 10px var(--shadow-color);
    padding: 1rem 2rem;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 100vw;
    margin: auto;
    max-width: 1200px;
    margin: 2rem auto 2.5rem auto;
    padding: 1.2rem 2.5rem;
    border-radius: 18px;
    background: var(--navbar-glass);
    box-shadow: 0 8px 32px 0 var(--shadow-color);
    border: 1.5px solid var(--navbar-border);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
}

.logo {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: 1px;
    color: var(--primary-color);
    text-shadow: 0 2px 8px rgba(79,140,255,0.10);
    -webkit-user-select: none;
    user-select: none;
    user-select: none;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--logo-color);
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: var(--secondary-color);
    font-weight: 500;
    padding: 8px 18px;
    border-radius: 8px;
    border-bottom: 2px solid transparent;
    transition: 
        color 0.3s, 
        border-bottom 0.3s, 
        background 0.3s, 
        box-shadow 0.2s;
    font-size: 1.08rem;
    position: relative;
}

.nav-link:hover {
    color: var(--primary-color);
    background: rgba(79,140,255,0.08);
    border-bottom: 2px solid var(--primary-color);
    box-shadow: 0 2px 8px rgba(79,140,255,0.08);
}

.nav-link.active {
    color: #fff;
    font-weight: 700;
    background: linear-gradient(90deg, var(--primary-color) 60%, var(--primary-hover-color) 100%);
    border-bottom: 2px solid var(--primary-hover-color);
    box-shadow: 0 4px 16px rgba(79,140,255,0.12);
    padding: 8px 22px;
    text-shadow: 0 2px 8px rgba(79,140,255,0.10);
}

.theme-btn {
    background: linear-gradient(90deg, var(--primary-color) 60%, var(--primary-hover-color) 100%);
    color: #fff;
    border: none;
    border-radius: 8px;
    padding: 0.6rem 1.5rem;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(79,140,255,0.10);
    transition: background 0.3s, transform 0.1s, filter 0.1s;
}
.theme-btn:hover {
    background: linear-gradient(90deg, var(--primary-hover-color) 60%, var(--primary-color) 100%);
    filter: brightness(1.08);
}
.theme-btn:active {
    transform: scale(0.96);
    filter: brightness(0.95);
}


/* --- Main Container --- */
.container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 2.5rem;
}

/* --- Card Styles --- */
.card {
    background: var(--card-bg-color);
    border-radius: 20px;
    padding: 2.5rem 2rem 2rem 2rem;
    box-shadow: 0 8px 32px 0 var(--shadow-color);
    border: 1.5px solid var(--border-color);
    transition: background 0.3s, box-shadow 0.3s;
    -webkit-backdrop-filter: blur(6px);
    backdrop-filter: blur(6px);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: "";
    position: absolute;
    top: -60px;
    right: -60px;
    width: 160px;
    height: 160px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover-color) 100%);
    opacity: 0.07;
    border-radius: 50%;
    z-index: 0;
}

.card > * {
    position: relative;
    z-index: 1;
}

/* --- Task Manager --- */
.task-manager h2, .weather-widget h2 {
    margin-bottom: 1.5rem;
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: 1px;
    color: var(--primary-color);
    text-shadow: 0 2px 8px rgba(79,140,255,0.08);
}

.task-input-container {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

#task-input {
    flex-grow: 1;
    padding: 0.75rem 1rem;
    border: 1.5px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    background: rgba(255,255,255,0.7);
    transition: border 0.2s, box-shadow 0.2s;
    outline: none;
}
#task-input:focus {
    border: 1.5px solid var(--primary-color);
    box-shadow: 0 2px 8px rgba(79,140,255,0.08);
}

button,
#add-task-btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    background: linear-gradient(90deg, var(--primary-color) 60%, var(--primary-hover-color) 100%);
    color: white;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s, transform 0.1s, filter 0.1s;
    box-shadow: 0 2px 8px rgba(79,140,255,0.10);
}

button:hover,
#add-task-btn:hover {
    background: linear-gradient(90deg, var(--primary-hover-color) 60%, var(--primary-color) 100%);
    filter: brightness(1.08);
}

    transition: background-color 0.3s, transform 0.1s, filter 0.1s;


button:hover,
#add-task-btn:hover {
    background: linear-gradient(90deg, var(--primary-hover-color) 60%, var(--primary-color) 100%);
    filter: brightness(1.08);
}


button:active,
#add-task-btn:active {
    transform: scale(0.96);
    filter: brightness(0.95);
}

.task-filters {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.filter-btn {
    background: none;
    border: 1.5px solid var(--border-color);
    color: var(--secondary-color);
    font-weight: 500;
    padding: 0.5rem 1.2rem;
    border-radius: 7px;
    transition: background 0.2s, color 0.2s, border 0.2s;
    box-shadow: none;
}

.filter-btn:hover {
    background: rgba(79,140,255,0.08);
    color: var(--primary-color);
    border: 1.5px solid var(--primary-color);
}

.filter-btn.active {
    background: linear-gradient(90deg, var(--primary-color) 60%, var(--primary-hover-color) 100%);
    color: #fff;
    border: 1.5px solid var(--primary-hover-color);
    box-shadow: 0 2px 8px rgba(79,140,255,0.10);
}

#task-list {
    list-style: none;
    max-height: 300px;
    overflow-y: auto;
    margin-bottom: 1rem;
}

.task-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0.5rem;
    border-bottom: 1px solid var(--border-color);
    transition: background 0.2s;
}

.task-item:last-child {
    border-bottom: none;
}

.task-item input[type="checkbox"] {
    margin-right: 1rem;
    cursor: pointer;
    accent-color: var(--primary-color);
    width: 1.1rem;
    height: 1.1rem;
}

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

.delete-btn {
    background: none;
    border: none;
    color: var(--accent);
    cursor: pointer;
    font-size: 1.3rem;
    padding: 0.2rem 0.5rem;
    border-radius: 6px;
    transition: background 0.2s, color 0.2s;
}
.delete-btn:hover {
    background: rgba(233,69,96,0.08);
    color: #fff;
}

#clear-all-btn {
    display: block;
    margin: 1.5rem auto 0;
    background: linear-gradient(90deg, #dc3545 60%, #e94560 100%);
    color: #fff;
    font-weight: 700;
    border: none;
    border-radius: 8px;
    padding: 0.7rem 2.2rem;
    box-shadow: 0 2px 8px rgba(233,69,96,0.10);
    transition: background 0.3s, transform 0.1s, filter 0.1s;
}
#clear-all-btn:hover {
    background: linear-gradient(90deg, #e94560 60%, #dc3545 100%);
    filter: brightness(1.08);
}
#clear-all-btn:active {
    transform: scale(0.96);
    filter: brightness(0.95);
}

/* --- Weather Widget --- */
.weather-search {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

#city-input {
    flex-grow: 1;
    padding: 0.75rem 1rem;
    border: 1.5px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    background: rgba(255,255,255,0.7);
    transition: border 0.2s, box-shadow 0.2s;
    outline: none;
}
#city-input:focus {
    border: 1.5px solid var(--primary-color);
    box-shadow: 0 2px 8px rgba(79,140,255,0.08);
}

#weather-info {
    text-align: center;
}

#weather-info h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

#weather-info .weather-icon {
    width: 54px;
    height: 54px;
    margin: 0.5rem auto;
    filter: drop-shadow(0 2px 8px rgba(79,140,255,0.10));
}

#weather-info p {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.error-text {
    color: #dc3545;
    font-weight: 500;
}

/* --- Footer --- */
footer {
    text-align: center;
    padding: 2rem;
    color: var(--secondary-color);
    font-size: 1.05rem;
    letter-spacing: 0.5px;
    margin-top: 2rem;
    opacity: 0.85;
}

/* --- Scrollbar Styling --- */
::-webkit-scrollbar {
    width: 8px;
    background: #e0e7ff;
    border-radius: 8px;
}
::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 8px;
    opacity: 0.5;
}

/* --- Responsive Design --- */
@media (max-width: 992px) {
    .container {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    nav {
        flex-direction: column;
        gap: 1.2rem;
        padding: 1.2rem 1rem;
    }
    .nav-links {
        gap: 1rem;
    }
    .card {
        padding: 2rem 1rem 1.5rem 1rem;

    }

    }
}

@media (max-width: 600px) {
    nav {
        padding: 0.7rem 0.5rem;
        margin: 1rem auto 1.5rem auto;
    }
    .logo {
        font-size: 1.3rem;
    }
    .card {
        padding: 1.2rem 0.5rem 1rem 0.5rem;
    }
    .container {
        padding: 0 0.2rem;
    }
    .card {
        padding: 2rem 1rem 1.5rem 1rem;
    }
}

@media (max-width: 600px) {
    nav {
        padding: 0.7rem 0.5rem;
        margin: 1rem auto 1.5rem auto;
    }
    .logo {
        font-size: 1.3rem;
    }
    .card {
        padding: 1.2rem 0.5rem 1rem 0.5rem;
    }
    .container {
        padding: 0 0.2rem;
    }
}