:root {
    --bg-color: #050505;
    --accent-primary: #00ff88;
    --accent-secondary: #00ccff;
    --text-main: #ffffff;
    --text-dim: #a0a0a0;
    --card-bg: rgba(255, 255, 255, 0.03);
    --card-border: rgba(255, 255, 255, 0.07);
}

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

html {
    overflow-x: hidden;
    width: 100%;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

.bg-glow {
    position: fixed;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0, 204, 255, 0.07) 0%, transparent 70%);
    top: -150px;
    left: -100px;
    z-index: 0;
    pointer-events: none;
}

#auth-screen {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
    z-index: 100;
    background-color: var(--bg-color);
}

.auth-box {
    width: 100%;
    max-width: 420px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 2.5rem 2rem;
    position: relative;
    overflow: hidden;
    animation: fadeInUp 0.5s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.auth-box::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
}

.auth-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 3px;
    color: var(--accent-primary);
    margin-bottom: 0.75rem;
}

.auth-title {
    font-size: 1.6rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
}

.auth-sub {
    font-size: 0.9rem;
    color: var(--text-dim);
    margin-bottom: 2rem;
}

.input-wrap {
    position: relative;
    margin-bottom: 1rem;
}

.input-wrap input {
    width: 100%;
    padding: 14px 16px;
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    color: var(--text-main);
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
    outline: none;
    transition: border-color 0.2s;
}

.input-wrap input:focus { border-color: var(--accent-primary); }
.input-wrap input.error { border-color: #ff4d6d; animation: shake 0.35s ease; }

.error-msg {
    font-size: 0.8rem;
    color: #ff4d6d;
    margin-top: 0.4rem;
    min-height: 1.1em;
    display: block;
}

.btn-auth {
    width: 100%;
    padding: 14px;
    margin-top: 0.5rem;
    background: var(--accent-primary);
    color: #000;
    font-family: 'Inter', sans-serif;
    font-size: 0.9rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-auth:hover { background: #fff; transform: translateY(-2px); box-shadow: 0 8px 20px rgba(0,255,136,0.25); }
.btn-auth:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

#tools-screen {
    display: none;
    min-height: 100vh;
    padding: 3rem 1.5rem;
    position: relative;
    z-index: 1;
}

.tools-container {
    max-width: 860px;
    margin: 0 auto;
}

.tools-header {
    margin-bottom: 3rem;
    animation: fadeInDown 0.6s forwards;
}

.pre-title {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 3px;
    color: var(--accent-primary);
    margin-bottom: 0.75rem;
}

.tools-header h1 {
    font-size: clamp(2rem, 8vw, 3.5rem);
    font-weight: 800;
    line-height: 1.1;
}

.tools-header h1 span {
    background: linear-gradient(to right, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.tools-header p {
    margin-top: 0.75rem;
    color: var(--text-dim);
    font-size: 1rem;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 1rem;
}

.tool-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 1.5rem;
    text-decoration: none;
    color: var(--text-main);
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
    position: relative;
    overflow: hidden;
    animation: fadeInUp 0.5s forwards;
}

.tool-card::before {
    content: '';
    position: absolute;
    inset: 0;
    opacity: 0;
    transition: opacity 0.3s;
}

.tool-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 30px rgba(0,0,0,0.3);
}


.tool-card--accent {
    --c1: var(--accent-primary);
    --c2: var(--accent-secondary);
}
.tool-card--accent::before {
    background: linear-gradient(135deg, rgba(0,255,136,0.04), transparent);
}
.tool-card--accent:hover {
    border-color: rgba(0, 255, 136, 0.3);
    box-shadow: 0 12px 30px rgba(0,0,0,0.3), 0 0 20px rgba(0,255,136,0.08);
}
.tool-card--accent:hover::before { opacity: 1; }
.tool-card--accent .tool-icon { color: var(--accent-primary); }
.tool-card--accent .tool-tag  { color: var(--accent-primary); border-color: rgba(0,255,136,0.25); }

.tool-card--audio::before {
    background: linear-gradient(135deg, rgba(251,191,36,0.05), transparent);
}
.tool-card--audio:hover {
    border-color: rgba(251,191,36,0.4);
    box-shadow: 0 12px 30px rgba(0,0,0,0.3), 0 0 20px rgba(251,191,36,0.10);
}
.tool-card--audio:hover::before { opacity: 1; }
.tool-card--audio .tool-icon { color: #fbbf24; opacity: 0.9; }
.tool-card--audio .tool-tag  { color: #fbbf24; border-color: rgba(251,191,36,0.3); }

.tool-icon {
    display: flex;
    align-items: center;
    opacity: 0.85;
}

.tool-name { font-size: 1.05rem; font-weight: 700; }

.tool-desc {
    font-size: 0.85rem;
    color: var(--text-dim);
    line-height: 1.5;
}

.tool-tag {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    border: 1px solid;
    border-radius: 50px;
    padding: 3px 10px;
    width: fit-content;
}


.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 3rem;
    gap: 1rem;
    flex-wrap: wrap;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--text-dim);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
    transition: color 0.2s, transform 0.2s;
}

.back-link:hover { color: var(--accent-primary); transform: translateX(-3px); }

.logout-btn {
    background: none;
    border: 1px solid rgba(255,255,255,0.12);
    color: var(--text-dim);
    font-family: 'Inter', sans-serif;
    font-size: 0.8rem;
    font-weight: 600;
    padding: 7px 16px;
    border-radius: 6px;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.2s;
}

.logout-btn:hover { border-color: #ff4d6d; color: #ff4d6d; }

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

@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-16px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes shake {
    0%,100% { transform: translateX(0); }
    20%      { transform: translateX(-8px); }
    40%      { transform: translateX(8px); }
    60%      { transform: translateX(-5px); }
    80%      { transform: translateX(5px); }
}

@media (max-width: 600px) {
    .auth-box { padding: 2rem 1.25rem; }
    .tools-grid { grid-template-columns: 1fr; }
    .tools-header h1 { font-size: 2rem; }
    #tools-screen { padding: 2rem 1rem; }
}