:root {
    --bg-dark: #0f0c29;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;

    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-highlight: rgba(255, 255, 255, 0.1);

    --accent: #a855f7;
    /* Purple */
    --accent-hover: #c084fc;
    --danger: #ef4444;

    --bg-gradient-center: #110d29;
    --bg-gradient-edge: #060411;
    --blob-1: #6b21a8;
    --blob-2: #1e3a8a;
    --blob-3: #0f766e;

    --modal-bg: rgba(15, 12, 41, 0.7);
    --input-bg: rgba(0, 0, 0, 0.3);
    --input-focus-bg: rgba(0, 0, 0, 0.5);
    --btn-secondary-bg: rgba(255, 255, 255, 0.05);
    --action-btn-bg: rgba(0, 0, 0, 0.6);
    --icon-bg: rgba(255, 255, 255, 0.08);
    --icon-bg-hover: rgba(255, 255, 255, 0.15);
    --greeting-gradient-1: #fff;
    --greeting-gradient-2: #cbd5e1;

    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

:root.light-mode {
    --bg-dark: #f8fafc;
    --text-main: #0f172a;
    --text-muted: #475569;

    --glass-bg: rgba(255, 255, 255, 0.8);
    --glass-border: rgba(0, 0, 0, 0.1);
    --glass-highlight: rgba(255, 255, 255, 1);

    --accent: #8b5cf6;
    --accent-hover: #7c3aed;
    --danger: #ef4444;

    --bg-gradient-center: #f1f5f9;
    --bg-gradient-edge: #e2e8f0;
    --blob-1: #d8b4fe;
    --blob-2: #bfdbfe;
    --blob-3: #99f6e4;

    --modal-bg: rgba(255, 255, 255, 0.85);
    --input-bg: rgba(0, 0, 0, 0.05);
    --input-focus-bg: rgba(0, 0, 0, 0.1);
    --btn-secondary-bg: rgba(0, 0, 0, 0.05);
    --action-btn-bg: rgba(0, 0, 0, 0.1);
    --icon-bg: rgba(0, 0, 0, 0.05);
    --icon-bg-hover: rgba(0, 0, 0, 0.1);
    --greeting-gradient-1: #1e293b;
    --greeting-gradient-2: #64748b;
}

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

body {
    font-family: 'Poppins', sans-serif;
    color: var(--text-main);
    background-color: var(--bg-dark);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow-x: hidden;
    position: relative;
}

/* Background Animation & Effects */
.background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    overflow: hidden;
    background: radial-gradient(circle at center, var(--bg-gradient-center) 0%, var(--bg-gradient-edge) 100%);
    transition: background var(--transition);
}

.noise-overlay {
    position: absolute;
    inset: 0;
    opacity: 0.03;
    pointer-events: none;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}

.blob {
    position: absolute;
    filter: blur(90px);
    opacity: 0.4;
    border-radius: 50%;
    animation: drift 25s infinite alternate ease-in-out;
}

.blob-1 {
    width: 500px;
    height: 500px;
    background: var(--blob-1);
    top: -10%;
    left: -10%;
    transition: background var(--transition);
}

.blob-2 {
    width: 400px;
    height: 400px;
    background: var(--blob-2);
    bottom: -10%;
    right: -10%;
    animation-delay: -5s;
    transition: background var(--transition);
}

.blob-3 {
    width: 300px;
    height: 300px;
    background: var(--blob-3);
    top: 40%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -12s;
    transition: background var(--transition);
}

@keyframes drift {
    0% {
        transform: scale(1) translate(0, 0);
    }

    100% {
        transform: scale(1.2) translate(80px, 50px);
    }
}

/* Layout */
.container {
    width: 100%;
    max-width: 900px;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 3.5rem;
    z-index: 1;
}

/* Header */
.header {
    text-align: center;
}

#greeting {
    font-size: 3rem;
    font-weight: 600;
    letter-spacing: -0.03em;
    margin-bottom: 0.25rem;
    text-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
    background: linear-gradient(135deg, var(--greeting-gradient-1), var(--greeting-gradient-2));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

#clock {
    font-size: 1.5rem;
    font-weight: 300;
    color: var(--text-muted);
}

/* Search Area */
.search-section {
    display: flex;
    justify-content: center;
}

#search-form {
    width: 100%;
    max-width: 650px;
}

.search-bar {
    display: flex;
    align-items: center;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 1.2rem 2rem;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    transition: var(--transition);
}

.search-bar:focus-within {
    border-color: var(--accent);
    background: rgba(255, 255, 255, 0.05);
    box-shadow: 0 8px 40px rgba(168, 85, 247, 0.2);
    transform: translateY(-2px);
}

.search-bar i {
    font-size: 1.5rem;
    color: var(--text-muted);
    margin-right: 1.2rem;
}

.search-bar input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-main);
    font-size: 1.15rem;
    font-family: inherit;
    outline: none;
}

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

/* Hub Section */
.hub-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding: 0 0.5rem;
}

.hub-header h3 {
    font-weight: 400;
    color: var(--text-muted);
    font-size: 1.1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.8rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-btn:hover {
    color: var(--accent);
    transform: scale(1.1);
}

/* Link Cards Grid */
.links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
    gap: 1.5rem;
}

.link-card {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem 1rem;
    border-radius: 20px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
}

.link-card:hover {
    transform: translateY(-8px);
    background: var(--glass-highlight);
    border-color: rgba(255, 255, 255, 0.15);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.3);
}

.link-icon-wrapper {
    width: 64px;
    height: 64px;
    border-radius: 18px;
    background: var(--icon-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-main);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
    overflow: hidden;
}

.link-card:hover .link-icon-wrapper {
    background: var(--icon-bg-hover);
}

.link-icon-wrapper img {
    width: 60%;
    height: 60%;
    object-fit: contain;
}

.link-name {
    font-size: 0.95rem;
    color: var(--text-main);
    text-align: center;
    width: 100%;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-weight: 400;
}

.link-actions {
    position: absolute;
    top: 6px;
    right: 6px;
    display: flex;
    gap: 4px;
    opacity: 0;
    transition: var(--transition);
}

.link-card:hover .link-actions {
    opacity: 1;
}

.action-btn {
    background: var(--action-btn-bg);
    backdrop-filter: blur(4px);
    border: none;
    color: #fff;
    /* Always white inside action button for contrast */
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 0.9rem;
    transition: var(--transition);
}

.action-btn:hover {
    background: var(--accent);
}

.action-btn.delete:hover {
    background: var(--danger);
}

/* Modal Styling */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100;
    opacity: 1;
    transition: var(--transition);
}

.modal-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.glass-card {
    background: var(--modal-bg);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 2.5rem;
    width: 90%;
    max-width: 480px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.1);
    transform: scale(1) translateY(0);
    transition: 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.modal-overlay.hidden .glass-card {
    transform: scale(0.95) translateY(20px);
}

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

.modal-header h3 {
    font-size: 1.5rem;
    font-weight: 500;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.6rem;
    color: var(--text-muted);
    font-size: 0.95rem;
}

.form-group input {
    width: 100%;
    background: var(--input-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 0.9rem 1.2rem;
    color: var(--text-main);
    font-family: inherit;
    font-size: 1rem;
    outline: none;
    transition: var(--transition);
}

.form-group input:focus {
    border-color: var(--accent);
    background: var(--input-focus-bg);
    box-shadow: 0 0 0 3px rgba(168, 85, 247, 0.15);
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    margin-top: 2.5rem;
}

.btn {
    padding: 0.8rem 1.8rem;
    border-radius: 12px;
    font-family: inherit;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    border: none;
    transition: var(--transition);
}

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

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
}

.btn-primary {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 4px 15px rgba(168, 85, 247, 0.4);
}

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(168, 85, 247, 0.6);
}

/* Animations */
.animate-fade-in-up {
    animation: fadeInUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) both;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsiveness */
@media (max-width: 640px) {
    .container {
        padding: 1.5rem;
        gap: 2.5rem;
    }

    #greeting {
        font-size: 2.2rem;
    }

    .search-bar {
        padding: 1rem 1.5rem;
    }

    .links-grid {
        grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
        gap: 1rem;
    }

    .link-card {
        padding: 1rem 0.5rem;
    }

    .link-icon-wrapper {
        width: 50px;
        height: 50px;
    }
}

/* Header theme toggle button */
.user-profile {
    position: fixed;
    top: 1.5rem;
    left: 1.5rem;
    z-index: 1000;
}

.theme-btn {
    position: absolute;
    top: 2rem;
    right: 2rem;
    z-index: 10;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.theme-btn:hover {
    background: var(--glass-highlight);
}

@media (max-width: 640px) {
    .theme-btn {
        top: 1rem;
        right: 1rem;
    }
}

/* Icon Upload Area */
.icon-upload-area {
    display: flex;
    align-items: center;
    gap: 1.2rem;
    background: var(--input-bg);
    border: 1px solid var(--glass-border);
    border-radius: 14px;
    padding: 0.8rem 1rem;
}

.icon-preview {
    width: 56px;
    height: 56px;
    flex-shrink: 0;
    border-radius: 12px;
    background: var(--icon-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    color: var(--text-muted);
    overflow: hidden;
}

.icon-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 10px;
}

.icon-upload-controls {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    flex: 1;
    min-width: 0;
}

.btn-sm {
    padding: 0.45rem 0.9rem;
    font-size: 0.85rem;
    border-radius: 8px;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-weight: 500;
    cursor: pointer;
    width: fit-content;
}

.logout-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    transition: var(--transition);
    padding: 0.2rem;
}

.logout-btn:hover {
    color: var(--danger);
    transform: scale(1.1);
}

.login-container {
    margin-bottom: 2rem;
    display: flex;
    justify-content: center;
}

.hidden {
    display: none !important;
}

@media (max-width: 640px) {
    .user-profile {
        position: static;
        margin-bottom: 1.5rem;
        display: flex;
        justify-content: center;
    }
}