/* --- CSS Custom Properties & Reset --- */
:root {
    --bg-base: #fcfaf8;
    --bg-surface: #ffffff;
    --text-primary: #1c1917;
    --text-secondary: #57534e;
    --accent-main: #b48545;
    --accent-hover: #9c7138;
    --border-color: #e7e5e4;
    --error-color: #dc2626;
    --success-color: #16a34a;
    --focus-ring: rgba(180, 133, 69, 0.3);
    
    --blob-1: rgba(180, 133, 69, 0.15);
    --blob-2: rgba(120, 113, 108, 0.1);
    
    --font-sans: 'Inter', system-ui, sans-serif;
    --transition-snappy: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --bg-base: #12100e;
    --bg-surface: #1c1917;
    --text-primary: #fafaf9;
    --text-secondary: #a8a29e;
    --border-color: #292524;
    --blob-1: rgba(180, 133, 69, 0.08);
    --blob-2: rgba(41, 37, 36, 0.4);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: var(--font-sans); background-color: var(--bg-base);
    color: var(--text-primary); min-height: 100vh;
    display: flex; flex-direction: column; overflow-x: hidden;
    transition: background-color var(--transition-snappy), color var(--transition-snappy);
}
a { text-decoration: none; color: inherit; }

/* --- Background Animations --- */
.dynamic-bg { position: fixed; inset: 0; z-index: -1; overflow: hidden; pointer-events: none; }
.blob { position: absolute; border-radius: 50%; filter: blur(80px); will-change: transform; }
.blob-1 { top: -10%; left: -10%; width: 50vw; height: 50vw; background: var(--blob-1); animation: float 24s infinite alternate ease-in-out; }
.blob-2 { bottom: -20%; right: -10%; width: 60vw; height: 60vw; background: var(--blob-2); animation: float 28s infinite alternate-reverse ease-in-out; }
@keyframes float { to { transform: translate(5%, 10%) scale(1.1); } }

/* --- Layout Architecture --- */
.top-nav { display: flex; justify-content: space-between; align-items: center; padding: 2rem 5%; width: 100%; position: absolute; z-index: 10; }
.brand { font-size: 1.2rem; font-weight: 600; letter-spacing: 0.05em; transition: opacity var(--transition-snappy); }
.brand:hover { opacity: 0.8; }
.brand span { color: var(--accent-main); }
.icon-btn { background: transparent; border: none; color: var(--text-primary); cursor: pointer; padding: 0.5rem; border-radius: 50%; transition: background var(--transition-snappy); }
.icon-btn:hover { background: var(--border-color); }

.auth-container { flex: 1; display: flex; align-items: center; justify-content: center; padding: 6rem 1.5rem 3rem; }
.auth-card { background: var(--bg-surface); width: 100%; max-width: 520px; padding: 3rem; border-radius: 16px; box-shadow: 0 4px 24px rgba(0, 0, 0, 0.04); border: 1px solid var(--border-color); }
.auth-header h1 { font-size: clamp(1.5rem, 4vw, 1.75rem); margin-bottom: 0.5rem; font-weight: 600; }
.auth-header p { color: var(--text-secondary); font-size: 0.95rem; margin-bottom: 2rem; line-height: 1.5; }

/* --- Form & Grid System --- */
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.form-group { position: relative; margin-bottom: 1.25rem; }
.input-wrapper { position: relative; }

/* Safely targets inputs without relying on 'type' attribute to prevent style loss on toggle */
.form-group input:not([type="checkbox"]) {
    width: 100%; padding: 1.25rem 1rem 0.5rem;
    background: transparent; border: 1px solid var(--border-color);
    border-radius: 8px; color: var(--text-primary); font-size: 1rem;
    transition: border-color var(--transition-snappy), box-shadow var(--transition-snappy);
    color-scheme: dark light;
    margin-top: 5px;
}
.form-group input:focus { outline: none; border-color: var(--accent-main); box-shadow: 0 0 0 3px var(--focus-ring); }
.form-group input.invalid { border-color: var(--error-color); }
.form-group input.valid { border-color: var(--success-color); }

.form-group label {
    position: absolute; left: 1rem; top: 50%; transform: translateY(-50%);
    color: var(--text-secondary); font-size: 1rem; pointer-events: none;
    transition: all 0.2s ease-out;
}
.form-group input:focus ~ label, .form-group input:not(:placeholder-shown) ~ label {
    top: 0.6rem; font-size: 0.75rem; transform: translateY(0); color: var(--accent-main);
}
.form-group input.invalid ~ label { color: var(--error-color); }
.pwd-toggle { position: absolute; right: 1rem; top: 50%; transform: translateY(-50%); background: none; border: none; font-size: 0.85rem; color: var(--text-secondary); cursor: pointer; font-weight: 500; }
.pwd-toggle:hover { color: var(--text-primary); }

.error-msg { display: block; color: var(--error-color); font-size: 0.8rem; margin-top: 0.4rem;  }

/* --- Password Strength Meter --- */
.strength-meter { display: flex; gap: 4px; margin-top: 8px; padding: 0 4px; }
.strength-bar { height: 4px; flex: 1; background-color: var(--border-color); border-radius: 2px; transition: background-color 0.3s ease; }
.strength-1 .strength-bar:nth-child(1) { background-color: var(--error-color); }
.strength-2 .strength-bar:nth-child(1), .strength-2 .strength-bar:nth-child(2) { background-color: #f59e0b; }
.strength-3 .strength-bar:nth-child(1), .strength-3 .strength-bar:nth-child(2), .strength-3 .strength-bar:nth-child(3) { background-color: #84cc16; }
.strength-4 .strength-bar { background-color: var(--success-color); }

/* --- Checkbox & Button Utilities --- */
.form-utilities { margin-bottom: 2rem; font-size: 0.9rem; }
.custom-checkbox { display: flex; align-items: flex-start; cursor: pointer; gap: 0.75rem; color: var(--text-secondary); line-height: 1.4; }
.custom-checkbox input { appearance: none; position: absolute; opacity: 0; }
.checkmark { min-width: 18px; width: 18px; height: 18px; border: 1.5px solid var(--border-color); border-radius: 4px; display: flex; align-items: center; justify-content: center; transition: var(--transition-snappy); margin-top: 2px; }
.invalid{border: 1px red solid;}

.custom-checkbox input:checked + .checkmark { background: var(--accent-main); border-color: var(--accent-main); }
.custom-checkbox input:checked + .checkmark::after { content: "✓"; color: white; font-size: 12px; }
.custom-checkbox input:focus-visible + .checkmark { box-shadow: 0 0 0 3px var(--focus-ring); }
.label-text a { color: var(--accent-main); font-weight: 500; }
.label-text a:hover { text-decoration: underline; }

.btn-primary { width: 100%; padding: 1.1rem; background: var(--accent-main); color: #fff; border: none; border-radius: 8px; font-size: 1rem; font-weight: 500; cursor: pointer; position: relative; overflow: hidden; transition: transform 0.1s, background var(--transition-snappy); }
.btn-primary:hover { background: var(--accent-hover); }
.btn-primary:active { transform: scale(0.98); }
.btn-primary:disabled { opacity: 0.7; cursor: not-allowed; }

.spinner { display: none; position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); width: 1.25rem; height: 1.25rem; border: 2px solid rgba(255, 255, 255, 0.3); border-top-color: #fff; border-radius: 50%; animation: spin 0.8s linear infinite; }
.btn-primary.loading .btn-text { opacity: 0; }
.btn-primary.loading .spinner { display: block; }
@keyframes spin { to { transform: translate(-50%, -50%) rotate(360deg); } }

.auth-footer { text-align: center; margin-top: 2rem; font-size: 0.95rem; color: var(--text-secondary); }
.auth-footer a { color: var(--accent-main); font-weight: 500; }
.auth-footer a:hover { text-decoration: underline; }

/* --- Responsive Breakpoints --- */
@media (max-width: 600px) {
    .auth-card { padding: 2rem 1.5rem; border-radius: 0; border: none; border-top: 1px solid var(--border-color); box-shadow: none; max-width: 100%; }
    .auth-container { padding: 5rem 0 0; }
    .form-row { grid-template-columns: 1fr; gap: 0; }
}