:root {
    --bg:        #0d1117;
    --surface:   #161b22;
    --surface2:  #1c2330;
    --border:    #2a3441;
    --border2:   #3d4f61;
    --teal:      #2dd4bf;
    --teal-dim:  #1a9e8f;
    --teal-glow: rgba(45,212,191,0.12);
    --teal-glow2:rgba(45,212,191,0.06);
    --cyan:      #67e8f9;
    --text:      #cdd9e5;
    --text-dim:  #768fa3;
    --text-muted:#4a5f72;
    --red:       #f87171;
    --green:     #4ade80;
    --mono:      'Space Mono', monospace;
    --sans:      'DM Sans', sans-serif;
}

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

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

/* Grid background */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
    background-size: 48px 48px;
    opacity: 0.35;
    pointer-events: none;
}

/* Radial teal glow center */
body::after {
    content: '';
    position: fixed;
    inset: 0;
    background: radial-gradient(ellipse 60% 50% at 50% 50%, rgba(45,212,191,0.055) 0%, transparent 70%);
    pointer-events: none;
}

/* Corner decorations */
.corner {
    position: fixed;
    width: 120px;
    height: 120px;
    pointer-events: none;
    opacity: 0.4;
}
.corner-tl { top: 0; left: 0; border-top: 1px solid var(--teal); border-left: 1px solid var(--teal); }
.corner-tr { top: 0; right: 0; border-top: 1px solid var(--teal); border-right: 1px solid var(--teal); }
.corner-bl { bottom: 0; left: 0; border-bottom: 1px solid var(--teal); border-left: 1px solid var(--teal); }
.corner-br { bottom: 0; right: 0; border-bottom: 1px solid var(--teal); border-right: 1px solid var(--teal); }

.container {
    position: relative;
    z-index: 10;
    width: 100%;
    max-width: 420px;
    padding: 1.5rem;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 2.5rem;
    animation: fadeDown 0.6s ease both;
}

.vault-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 1.25rem;
    position: relative;
}

.vault-icon svg {
    width: 100%;
    height: 100%;
    filter: drop-shadow(0 0 12px rgba(45,212,191,0.5));
}

.brand {
    font-family: var(--mono);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--teal);
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.brand-sub {
    font-family: var(--mono);
    font-size: 0.65rem;
    color: var(--text-muted);
    letter-spacing: 0.2em;
    text-transform: uppercase;
    margin-top: 0.3rem;
}

/* Card */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 2rem;
    position: relative;
    animation: fadeUp 0.6s ease 0.1s both;
}

.card::before {
    content: '';
    position: absolute;
    top: -1px; left: -1px; right: -1px;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--teal), transparent);
    border-radius: 4px 4px 0 0;
}

/* Tab switcher */
.tabs {
    display: flex;
    gap: 0;
    margin-bottom: 1.75rem;
    border: 1px solid var(--border);
    border-radius: 3px;
    overflow: hidden;
}

.tab-btn {
    flex: 1;
    padding: 0.55rem 0.5rem;
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-family: var(--mono);
    font-size: 0.68rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    cursor: pointer;
    transition: all 0.2s;
    border-right: 1px solid var(--border);
}

.tab-btn:last-child { border-right: none; }

.tab-btn.active {
    background: var(--teal-glow);
    color: var(--teal);
}

.tab-btn:hover:not(.active) {
    background: var(--surface2);
    color: var(--text-dim);
}

/* Form */
.form-panel { display: none; }
.form-panel.active { display: block; }

.field {
    margin-bottom: 1.25rem;
}

.field label {
    display: block;
    font-family: var(--mono);
    font-size: 0.65rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.field input {
    width: 100%;
    padding: 0.65rem 0.85rem;
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: 3px;
    color: var(--text);
    font-family: var(--mono);
    font-size: 0.85rem;
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.field input:focus {
    border-color: var(--teal-dim);
    box-shadow: 0 0 0 3px var(--teal-glow);
}

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

/* Hint */
.hint {
    font-size: 0.72rem;
    color: var(--text-muted);
    margin-top: 0.4rem;
    font-family: var(--mono);
}

/* Button */
.btn-primary {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--teal);
    border: none;
    border-radius: 3px;
    color: #0d1117;
    font-family: var(--mono);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    cursor: pointer;
    transition: all 0.2s;
    margin-top: 0.25rem;
    position: relative;
    overflow: hidden;
}

.btn-primary:hover {
    background: var(--cyan);
    box-shadow: 0 0 20px rgba(45,212,191,0.35);
}

.btn-primary:active { transform: scale(0.98); }

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* Status messages */
.msg {
    padding: 0.65rem 0.85rem;
    border-radius: 3px;
    font-family: var(--mono);
    font-size: 0.72rem;
    letter-spacing: 0.04em;
    margin-bottom: 1.25rem;
    display: none;
}

.msg.error  { background: rgba(248,113,113,0.1); border: 1px solid rgba(248,113,113,0.3); color: var(--red); display: block; }
.msg.success{ background: rgba(74,222,128,0.08); border: 1px solid rgba(74,222,128,0.25); color: var(--green); display: block; }

/* Spinner */
.spinner {
    display: inline-block;
    width: 14px; height: 14px;
    border: 2px solid rgba(0,0,0,0.3);
    border-top-color: #0d1117;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    vertical-align: middle;
    margin-right: 6px;
}

/* Footer */
.footer {
    text-align: center;
    margin-top: 1.5rem;
    font-family: var(--mono);
    font-size: 0.6rem;
    color: var(--text-muted);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    animation: fadeUp 0.6s ease 0.3s both;
}

/* Animations */
@keyframes fadeDown {
    from { opacity: 0; transform: translateY(-16px); }
    to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(12px); }
    to   { opacity: 1; transform: translateY(0); }
}
@keyframes spin {
    to { transform: rotate(360deg); }
}